The type of power supply, as already noticed - pulse. Such a solution sharply reduces the weight and size of the structure, but it works not worse than an ordinary network transformer to which we are accustomed. The scheme is collected on the powerful driver IR2153. If the chip in the DIP case, then the diode must be installed. At the expense of the diode, pay attention, it is not normal, but ultrafine, since the operating frequency of the generator is tens of kilohertz and ordinary rectaging diodes are not suitable here.

In my case, the whole scheme was collected at the "scattering" because it was collected only to verify performance. I practically did not configure the scheme and immediately earned as the Swiss watch.

Transformer - It is advisable to take ready, from computer Block Nutrition (suitable literally any, I took a transformer with a pigtail from the block nutrition ATX 350 watts). At the output of the transformer, you can use a straightener from Schottky diodes (can also be found in computer diodes), or any fast and ultra-free diodes with a current of 10 amps and more, you can also put our KD213A.

Connect the diagram to the network through the incandescent lamp 220 volts 100 watts, in my case all the tests made the inverter 12-220 with protection against the KZ and the overload and only after the accurate setting decided to connect 220 volts to the network.

How should the collected scheme work?

• The keys are cold, without output load (I even have a 50 watt with an output load, the keys remained ice).
• The microcircuit should not overheat during work.
• On each condenser should be the voltage of the order of 150 volts, although the rating of this voltage can be discarded by 10-15 volts.
• The scheme should work silently.
• The microcircuit resistor (47K) should be a little overheated during operation, there is also an insignificant overheating of the resistor of the standard (100 ohms).

The main problems that occur after the assembly

Problem 1. Assembled the circuit, when connecting the control light, which is connected to the transformer output flashes, and the diagram itself makes incomprehensible sounds.

Decision. Most likely, there is not enough voltage to feed the chip, try to reduce the resistance of the resistor 47k to 45, if it does not help, then up to 40 and so (with a step 2-3k) until the diagram does not work normally.

Problem 2. Assembled the scheme, when applying, nothing heats up and does not explode, but the voltage and current at the output of the transformer is meager (almost evenly zero)

Decision. Replace the 400 volt 1MKF capacitor to the 2MGN choke.

Problem 3. One of the electrolytes is greatly heated.

Decision. Most likely it is non-working, replace the diode rectifier for a new one and at the same time, it can be a change in the capacitor to the condenser precisely because of the non-working rectifier.

Pulse power supply on IR2153 can be used to power powerful, high-quality amplifiersor use as a charger for powerful lead batteries, it is possible and as a power supply - all at your discretion.

The power of the block can reach up to 400 wattsFor this, it will be necessary to use a transformer from ATC to 450 watts and replace electrolytic capacitors for 470MCF - and that's it!

In general, the pulsed power supply can be collected in just 10-12 $ and then if you take all the components from the radio car, but each radio amateur has more than half of the radio components used in the scheme.

A radio amateur needed a safe power source from a 220 V network, with which you can set up and test independently collected electronic devices, as well as repair industrial manufacturers. Such a power source during power supply from the lighting network 220 V must maintain operation at a current in the load to 10 A and be able to reserve power to ensure uninterrupted operation. This may be required, for example, in the conditions of the countryside, when the voltage in the network is unstable or periodically disconnected. In fig. Below is presented electrical circuit Power supply that meets all these requirements.

The voltage stabilizer on the transistor ѵtz and the VD2-VD5 stabilods is assembled according to the classic scheme. Turning on the power supply is performed "manually" with a switch (toggle switch) SB1. When power is applied on the K1 relay, it is triggered and closed with contacts K1.1 The power supply circuit of the primary winding of the T1 transformer. The voltage is rectified by a diode bridge VD1 enters the source stabilizer, then to the current amplifier on the transistors VT1, ѵT2 and further to the load device. Simultaneously on the car battery (AKB), which serves as a backup power source, recharging voltage via VD6 diode and the restrictive resistor R4. The small current recharging of the battery depends on the degree of battery discharge, given its greater energy intensity of 55 A / h, does not output the battery, even with a long (multi-dressed) mode of its recharging. In this case, the SB2 switch can be forcibly disconnecting the battery from recharging.

In an emergency mode (the lack of voltage of the lighting network 220 c) the relay K1 is de-energized, and the voltage from the backup power source (AKB) is supplied through closed contacts 5 and 6 of the contact groups to 1.2 relays K1, bypassing the voltage stabilizer collected on the elements VT1, ѵT2, ѵtz , VD2, VD3, VD4, VD5, R2, R3. To protect the source from overvoltage and short circuit, fuses are FU1 and FU2 installed accordingly at the input and output of the power supply.

If there is no need for backup power, then the battery is not connected, and the device is used as a stable powerful power supply.

In establishing the power source does not need. The body of the device is made of fiberglass, but can be performed from another dielectric material.

Transistors VT1, ѵT2 can be replaced by KT808, KT819 with any letter index. It is advisable to apply these transistors in metal building With a diameter of "Hats" 23.5 mm. They are installed on heat sinks with a cooling area of \u200b\u200bat least 100 cm2, isolating the heat sink from the device housing. The transistor ѵtz can be replaced by KT815, KT817 with any letter index.

The T1 transformer is standard with an output power of at least 100 W should provide an alternating voltage on the secondary winding (under load) 14-16 B. This voltage is obtained from the conclusions 7 and 16 of the transformer TN-54-127 / 220, the jumpers must be installed between with leads 8-9, 10-11 and 13-14. Primary winding of the T1 transformer - conclusions 1 and 2.

Akb- standard accumulator battery with a rated voltage of 12 V. relay K1 - on the voltage of the response 200-20 V with two and more groups of contacts and the switching current of at least 3 A.

Network fuse FU1 type VII-1-3, PC-30-3 per current 3 A. Fuse FU2 for current 10 A Type DPK-1-2. Diode rectifier bridge type KC405A, KC407A or collected from discrete elements - diodes D231, D242 with any alphabetic index. VD6 diode can be replaced by KD202, CD213, CD258 with any letter index and similar. VD2- VD5 stabilids are preferably set in accordance with the specified in the diagram. The stabilization and level of output voltage depends on their parameters.

Capacitors C1, C2 type K40-U9, K10-17 or similar, calculated on work voltage At least 250 V oxide capacitors of type K50-ZB, K50-24 or similar. Permanent resistors R2, R3- type MLT-0.5. Resistors R1, R4 type PEV-10, TRAP-10. Switches (Tumbler) SB1 and SB2 any suitable, for example, TV2-1.

Literature: Andrei Kashkarov - electronic homemade

Competition of novice radio amateurs
"My amateur construction"

The design of a simple laboratory power supply unit on transistors from "0" to "12" volts, and detailed description All device manufacturing process

Competitive design of a novice radio amateur:
"Adjustable power supply 0-12 V on transistors"

Hello respected friends and guests of the site!
I present to your court the fourth competitive work.
Construction author - Folkin Dmitry, city Zaporizhia, Ukraine.

Adjustable power supply 0-12 V in transistors

I needed a BP, adjustable from 0 and to ... in (the more, the better). I revised several books and stopped on the design proposed in the Borisov Book "Young Radio". There is very good everything is painted, just for a novice radio amateur. In the process of creating such a complex device for me, I allowed some errors whose analysis I did in this material. My device consists of two parts: an electrical part and a wooden housing.

Part 1. Electrical part of BP.

Picture 1 - Concept electrical power supply diagram from book

I started with the selection of necessary details. Some of them I found at my own, and others bought on a radio station.

Figure 2 - Details for electrical part

In fig. 2 Presents such details:

1 - Voltmeter.showing the output voltage of BP (I bought a voltmeter without a name with three scales, to which for the correct readings it is necessary to select a shunt resistor);
2 - Fork power supply BP (I took a charging from Motorola, took out a fee, and left the plug);
3 - Light Bulb with Patronwhich will serve as an indicator of connecting BP to the network (Light bulb 12.5 to 0.068 A, two of these I found in some old radio);
4 - switch from network extension For a computer (inside it has a light bulb, unfortunately, I had burnt);
5 - resistor 10 com Variable adjustment group A. with a linear functional characteristic and a handle to it; Need for smooth change Output voltage of BP (I took a joint venture, and the handle from the radio receiver);
6 - Red "+" and black "-" Terminalsserving to connect the load to the BP;
7 - fuse 0.5 Ainstalled in the clamps on the legs (I found in the old radio glass fuse 6T500 with four legs);
8 - transformer reduced 220 V / 12 V Also on four legs (you can TWEC-70; I had without labeling, but the seller wrote on it "12 V");
9 - four diode with maximum straightened current 0.3 a For rectifying diode bridge (can be D226, series D7 with any letter or rectifier block KC402; I took D226B);
10 - transistor of medium or high power with the radiator and the fixing flange (it is possible p213b or p214 - p217; I took P214 immediately with the radiator so as not to burn);
11 - two electrolytic capacitor by 500 μF or more, one 15 V or more, the second 25 V or more (you can K50-6; I took the K50-35 both per 1000 Igf, one 16 V, the second 25 V);
12 - Stabilitron with voltage of stabilization 12 V (can be D813, D811 or D814G; I took D813);
13 - low-power low-frequency transistor (you can MP39, MP40 - MP42; I have MP41A);
14 - Resistor Permanent 510 Ohm, 0.25 W (can mlt; I took the trim joint venture on 1 com, because its resistance will need to be selected);
15 - resistor permanent 1 com, 0.25 W (I got high-precision ± 1%);
16 - Resistor Permanent 510 Ohm, 0.25 W (I have a mlt)
Also for the electric part it took me:
- one-sided foil textolite (Fig. 3);
– homemade minider with drills with a diameter of 1, 1.5, 2, 2.5 mm;
- Wiring, bolts, wrenches and other materials and tools.

Figure 3 - On the Radiorenka I got very old Soviet textolit

Next, measuring the geometric dimensions of the existing elements, I drew a future fee in a program that does not require installation. Then I took up the manufacture of a printed circuit board by the LUT method. I did this for the first time, so I used this video tutorial _http: //habrahabr.ru/post/45322/.

Package manufacturing steps:

1 . Printed in printing house on laser printer On glossy paper, 160 g / m2 drawn board and cut out (Fig. 4).

Figure 4 - Image of tracks and location of elements on glossy paper

2 . Sliced \u200b\u200ba piece of textolite in size 190x90 mm. Behind the lack of scissors in the metal used the usual stationery scissors, it was cut for a long time and hard. Using sandpaper null and 96% ethyl alcohol prepared textolite to the toner transfer (Fig. 5).

Figure 5 - Prepared foil textolite

3 . First, with the help of the iron, the toner moved from paper to the metallized part of the textolite, heated for a long time, about 10 minutes (Fig. 6). Then I remembered that I wanted to do more and silk screen, i.e. Drawing the picture on the floorboard. She put the paper with the image of parts for not metallized part of the textolite, heated not long, about 1 minute, it turned out badly. Still, first had to be silk screen, and then transfer tracks.

Figure 6 - Paper on textolite after warming up iron

4 . Next you need to remove this paper from the surface of the textolite. I used warm water and a brush for shoes with metal vehicles in the middle (Fig. 7). Rubbed paper very diligently. Perhaps it was a mistake.

Figure 7 - Brush for footwear

5 . After washing from glossy paper, in Figure 8 it can be seen that the toner was transferred, but some tracks are broken. Surely it is due to the hard work with a brush. Therefore, I had to buy a marker for CD \\ DVD discs and draw them almost all tracks and contacts manually (Fig. 9).

Figure 8 - Textolite after toner and paper removal

Figure 9 - Doricated marker tracks

6 . Next, it is necessary to raise the unnecessary metal from the textolite, leaving the drawn tracks. It was done like this: he poured 1 l of warm water into the plastic appeal, poured there the floor of a chlorine iron jar and stuck with a plastic teaspoon. Then put a foil textolite on the marked tracks (Fig. 10). On a jar with chlorine iron, the promised etching time is 40-50 minutes (Fig. 11). Afterby specified timeI did not find any changes on the future fee. Therefore, it poured all the chlorine iron, which was in the jar, in the water and signed. In the process of etching, I stirred a solution with a plastic spoon for accelerating the process. It was still for a long time, about 4 hours. To speed up etching, it would be possible to warm the water, but I did not have such an opportunity. The solution with the chlorine gland can be restored by iron nails. I did not have them, so I used thick bolts. Copper delzyged on bolts, and a precipitate appeared in the solution. I have merged into a three-liter plastic bottle with thick neck and put in the storage room.

Figure 10 - Printed circuit board floats in chlorine iron solution

Figure 11 - Jar with chlorine iron (the mass is not specified)

7 . After etching (Fig. 12), I neatly washed the board with warm water with soap and removed the toner from the ethyl alcohol tracks (Fig. 13).

Figure 12 - Textolite with etched paths and toner

Figure 13 - Textolite with etched tracks without toner

8 . Next, I began to drill holes. For this, I have a homemade minider (Fig. 14). For her manufacture I had to disassemble the old broken printer Canon. I250. From there I took a motor at 24 V, 0.8 A, the power supply to it and the button. Then, on the radio launch, I purchased a collet cartridge on the shaft 2 mm and 2 sets of drill with a diameter of 1, 1.5, 2, 2.5 mm (Fig. 15). The cartridge is put on the shaft of the motor, the drill with the holder is inserted and clamped. From above, I glued on the motor and soldered a button that brings the minider into action. The drills are not particularly centered, so they are a little "leads" on the parties when working, but can use as far as much as possible.

Figure 14 -

Figure 15 -

Figure 16 - Saving holes

9 . Then cover the flow fee, lubricating it with a thick layer of pharmacy glycerin with a brush. After that, you can browse the tracks, i.e. covering their tin layer. Starting with wide tracks, a big drop of solder on a soldering iron I drove along the tracks until I did not get a fee (Fig. 17).

Figure 17 - Luzzy fee

10. In the end, it was installed on the fee. I started from the most massive transformer and radiator, and finished with transistors (I read somewhere that the transistors always solder in the end) and connecting wires. Also at the end of the installation in the rupture of the stabilion chain, marked in Fig. 1 cross, I turned on the multimeter and picked up such a resistance of the steering resistor SP4-1 so that a current of 11 mA is installed in this chain. This adjustment is described in the Borisov Book "Young Radio".

Figure 18 - Fees with details: bottom view

Figure 19 - Fees with details: top view

Figure 18 shows that I did not guess a little with the location of the holes for the installation of the transformer and the radiator, I had to reacher. Also, almost all holes for radio components turned out to be slightly smaller in diameter, because the legs of radio components were not versed. Perhaps the holes have become less after the meadow of the solder, therefore it would be necessary to drill them after the meadow. Separately, I must say about the holes for transistors - their location also turned out to be wrong. Here I needed more carefully and carefully draw the scheme in the Sprint-layout program. When the base, the emitter and collector of the transistor P214 should be taken into account that the radiator is installed on the board with its underside (Fig. 20). To solder the contest of P214 transistor to the desired tracks I had to use copper pieces of wire. And the transistor MP41A had to bend the base output to the other side (Fig. 21).

Figure 20 - Openers for the conveyor conveyors P214

Figure 21 - Holes for the conveyor of the transistor MP41A

Part 2. Manufacture of a wooden bp housing.

For the housing I needed:
- 4 plywood boards 220x120 mm;
- 2 plywood boards 110x110 mm;
- 4 plywood pieces 10x10x110 mm;
- 4 plywood pieces 10x10x15 mm;
- Nails, 4 superclone tube.

Chassis manufacturing steps:

1 . At first I saw a large piece of plywood on the boards and pieces of the required size (Fig.22).

Figure 22 - Dumpless plywood boards for hull

2 . Then he drilled with a minider hole under the wires on the power supply of power supply.
3 . Then connected the bottom and side walls of the housing with the help of nails and super block.
4 . Next glued internal wooden parts of the structure. Long racks (10x10x110 mm) glued to the bottom and on the sides, while holding the side walls. Small square pieces glued to the bottom, they will be installed and attached printed circuit board (Fig. 23). Also inside the plug and behind the case, I secured the holders for wires (Fig. 24).

Figure 23 - Case: Front view (visible leaks)

Figure 24 - Case: side view (and then glue makes itself felt)

5 . The front panel of the case was carried out: voltmeter, light bulb, switch, variable resistor, two terminals. I needed to drill five round and one rectangular hole. It took a long time, since the necessary tools was not and had to use what was at hand: a minider, rectangular file, scissors, sandpaper. In fig. 25 You can see a voltmeter, to one of the contacts of which is attached by the shunting trigger resistor per 100 com. Experimed by using 9 in the battery and the multimeter, it was found that the voltmeter gives the right testimony when the shunt resistance is 60 com. The cartridge for the light bulb perfectly glued to the superclauses, and the switch and without glue fastened well in the rectangular hole. A variable resistor spun into a tree well, and the terminals were fixed on nuts and bolts. From the switch, I removed the highlighting light bulb, so two contacts remained on the switch instead of three.

Figure 25 - BP

Configuring the board in the case by setting the necessary items on the front panel by connecting the components using the wires and attaching the front wall by the superclaim I received a ready-made functional device (Fig. 26).

Figure 26 - Ready BP

In fig. 26 can be seen in color that the light is another, not the one that came in initially. Indeed, when connected 12.5 to the bulb, designed for the current 0.068 A to the secondary winding of the transformer (as indicated in the book), it burned in a few seconds of work. Probably due to a large current in the secondary winding. It should be found a new place to attach the bulbs. Light bulb I replaced the same by the same parameters, but painted in a dark blue (so that the eyes are not blinded) and with the help of the wires, it swept it in parallel after the C1 condenser. Now it works for a long time, but the book indicates the voltage in the chain equal to 17 V and I am afraid you will have to look again a new place for the light bulb. Also in fig. 26 It can be seen that the spring is inserted from above. It is necessary for reliable operation of the button that dangled. The handle on a variable resistor, changing the output voltage of BP for better ergonomics was shortened.
When the BP is turned on, I carry out the testimony of the voltmeter and the multimeter (Fig. 27 and 28). The maximum output voltage is 11 V (1 V somewhat fived). Further I decided to measure the maximum output current and when setting on a multimeter maximum limit In 500 mA arrow bash. This means that the maximum output current is a few more than 500 mA. When the variable resistor's handle is smoothly, the output voltage of BP also varies smoothly. But the voltage change from zero does not start immediately, but after about 1/5 turns of the handle.

So, having spent a significant amount of time, strength and finance, I still collected a power supply with an adjustable output voltage of 0 - 11 V and output current of more than 0.5 A. If I could, then anyone can also. Good luck to all!

Figure 27 - Vesh BP

Figure 28 - Checking the validity of the voltmeter readings

Figure 29 - Installation of the output voltage 5 V and checking using a bevel light bulb

Dear friends and guests of the site!

Do not forget to express your opinion on competitive work and take part in discussions on the site forum. Thank you.

Applications to the design:

(15.0 KIB, 1,657 HITS)

(38.2 KIB, 1,535 HITS)

(21.0 KIB, 1,043 HITS)

How to assemble a simple power supply and a powerful voltage source.
Sometimes you have to connect various electronic devices, including homemade, to the source constant voltage 12 volts. The power supply is easy to assemble yourself within half of the output day. Therefore, there is no need to acquire ready blockIt is more interesting to independently make the necessary thing for your laboratory.


Anyone who wants to make a 12-volt block independently, without any particular difficulty.
Someone needs a source for powering the amplifier, and to whom to power the small TV or radio ...
Step 1: What parts are needed to build the power supply ...
To build a block, prepare in advance electronic components, parts and accessories from which the block itself will be collected ....
-Circuit board.
- Diode 1N4001 diode, or similar. Bridge diode.
Voltage outbill LM7812.
-Mapless lowering transformer by 220 V, secondary winding Must have 14B - 35V of alternating voltage, with a load current from 100 mA to 1a, depending on what power it is necessary to obtain at the output.
-Electrolitic capacitor with a capacity of 1000mkf - 4700MKF.
CONDACTER Capacity 1UF.
- The condenser with a capacity of 100NF.
- Cutting the mounting wire.
-Diator, if necessary.
If you need to get the maximum power from the power source, it is necessary to prepare the appropriate transformer, diodes and a radiator for the microcircuit.
Step 2: Tools ....
For the manufacture of the unit requires installation tools:
-Passer or soldering station
- Support
-Mothy tweezers
-Works for stripping wires
-Force for solder suction.
-Screwdriver.
And other tools that may be useful.
Step 3: Scheme and others ...


To obtain 5 volt stabilized nutrition, you can replace the LM7812 stabilizer on LM7805.
To increase the load capacity of more than 0.5 amps, you will need a radiator for the chip, otherwise it will fail from overheating.
However, if you need to get several hundred milliampers (less than 500 mA) from the source, then you can do without a radiator, the heating will be insignificant.
In addition, the LED is added to the diagram to visually make sure that the power supply is working, but you can do without it.

12V 30A Power Block Scheme.
When applying one stabilizer 7812 as a voltage regulator and several powerful transistorsThis power supply is capable of providing an output current of load up to 30 amps.
Perhaps the most expensive detail of this scheme is the power reduced transformer. The secondary winding voltage of the transformer must be somewhat longer than the stabilized voltage of 12V to ensure the operation of the chip. It should be borne in mind that it is not necessary to strive for a greater difference between the input and output voltage value, since with such a current, the heat sink radiator output transistors is significantly increased in size.
In the transformer diagram, the diodes used must be designed for a large maximum direct current, approximately 100a. Through a chip 7812, the flowing maximum current in the circuit will not be more than 1A.
The six composite transistors of Darlington type TIP2955 included in parallel, provide loaded current 30a (each transistor is designed for current 5a), such a high current requires the corresponding radiator size, each transistor passes through itself one sixth part of the load current.
To cool the radiator, you can apply a small fan.
Power supply check
When you first turn on it is not recommended to connect the load. Check the performance of the scheme: connect the voltmeter to the output terminals and measure the voltage value, it should be 12 volts, or the value is very close to it. Next, connect the load resistor 100 ohms, the dispersion capacity is 3 W, or a similar load - the type of incandescent lamp from the car. In this case, the voltmeter reading should not be changed. If there is no 12 volt voltage at the output, turn off the power and check the installation and correctness of the items.
Before installing, check the condition of power transistors, since when the transistor is broken, the voltage from the rectifier is straightened to the output of the circuit. To avoid this, check on short circuit Power transistors, for this measure the multimeter by separately the resistance between the collector and the emitter of transistors. This check must be carried out before installing them in the scheme.

Power supply 3 - 24V

Power supply circuit issues adjustable voltage In the range from 3 to 25 volts, with a maximum load current to 2a, if we reduce the current-boundary resistor 0.3 ohms, the current can be increased to 3 amps and more.
Transistors 2N3055 and 2N3053 are installed on the corresponding radiators, the power of the restrictive resistor must be at least 3 W. Voltage adjustment is monitored by LM1558 or 1458. When using OU 1458, it is necessary to replace the elements of the stabilizer supplying the voltage from the output 8 to 3 OU from the divider on the resistors with a nominal 5.1 K.
Maximum constant voltage for power supply of OU 1458 and 1558 36 V and 44 in respectively. The power transformer must produce a voltage at least 4 volts larger than the stabilized output voltage. The power transformer in the scheme has a voltage voltage 25.2 volts alternating current With a discharge in the middle. When switching windings, the output voltage decreases to 15 volts.

Power supply diagram by 1.5 V

Power supply diagram for obtaining a voltage of 1.5 volts, a downstream transformer is used, a bridge rectifier with a smoothing filter and LM317 chip.

The diagram of the adjustable power supply unit from 1.5 to 12.5 V

Power supply circuit with an output voltage adjustment to obtain a voltage of 1.5 volts to 12.5 volts, the LM317 chip is used as a regulatory element. It must be installed on the radiator, on an insulating gasket to exclude the closure on the body.

Power supply unit with fixed output voltage

Power supply diagram with fixed output voltage 5 volt or 12 volts. As an active element, the LM 7805 chip, LM7812, is used to be installed on the radiator for cooling the heating of the housing. Selecting a transformer is shown on the left on the plate. By analogy, you can perform a power supply and other output voltages.

Power supply circuit 20 watts with protection

The scheme is intended for a small self-made manufacturer transceiver, author DL6GL. When developing a block, a task was put to have an efficiency of at least 50%, the supply voltage rated 13.8V, a maximum of 15V, on the load current 2,7A.
What is the scheme: Pulse power supply or linear?
Pulse power supplies It turns out a small and efficiency, but it is not known how to behave in critical situation, throws output voltage ...
Despite the disadvantages, a linear regulation scheme is chosen: a sufficiently bulky transformer, not a high efficiency, it is necessary cooling, etc.
Details are applied homemade block Power supply in the 1980s: a radiator with two 2N3055. Not enough only μA723 / LM723 voltage regulator and several small parts.
Voltage voltage regulator is assembled on the μA723 / LM723 chip in the standard inclusion. Output transistors T2, T3 type 2N3055 for cooling are installed on radiators. Using the R1 potentiometer, an output voltage is installed within 12-15V. With the help of a variable resistor R2, the maximum drop of the voltage on the R7 resistor is set, which is 0.7V (between contacts 2 and 3 chip).
For the power supply unit, a toroidal transformer is used (there may be any at your discretion).
On the MC3423 chip, the scheme is collected when voltage (emissions) at the output of the power supply, adjusting R3 is set to the voltage voltage threshold 2 from the R3 / R8 / R9 divider (2.6V reference voltage), the voltage of the BT145 opens the BT145 discovery Causes short circuit leading to the triggering of the fuse 6,3A.

To prepare the power supply to operation (the fuse 6,3A is not yet involved) to set output voltage, for example, 12.0V. Load the load unit, for this you can connect halogen lamp 12V / 20W. R2 Adjust that the drop in the voltage was 0.7V (current must be in the range of 3,87 0.7 \u003d 0.185ωх3.8).
Customize the response of overvoltage protection, for this we smoothly set the output voltage of 16V and adjust R3 to trigger protection. Next, set the output voltage to normal and install the fuse (before that put the jumper).
The described power supply can be reconstructed for more powerful loads, to do this, install a more powerful transformer, optional transistors, strapping elements, rectifier at its discretion.

Homemade power supply at 3.3V

If necessary powerful block nutrition, by 3.3 volts, then it can be made, alter old block PC power or using the above schemes. For example, in the power supply circuit by 1.5 V, replace the resistor 47 Ohm more nominal, or put the potentiometer for convenience, adjusting to the desired voltage.

Transformer power supply on KT808

Many radio amateurs remained old Soviet radio components, which are found without affairs, but that can be successfully applied and they faithfully will serve for a long time, one of the well-known UA1Zh schemes, which walks through the Internet. Many copies and arrows are broken on the forums when discussing what is better field-effect transistor Or ordinary silicon or Germany, which temperature of the heating of the crystal will they withstand and which of them are more reliable?
Each side has its own arguments, well, you can get parts and make another simple and reliable power supply. The scheme is very simple, protected from current overload and parallel inclusion Three CT808 can issue a current 20a, the author used such a block with 7 parallel transistors and gave up a load of 50a, while the capacitor of the filter capacitor was 120,000 μF, the secondary winding voltage of 19V. It must be borne in mind that the contacts of the relay must switch such a high current.

Subject to proper installation, the output voltage drawdown does not exceed 0.1 volts

Power supply for 1000V, 2000V, 3000V

If we need to have a constant voltage source for high voltage to power the transmitter output cascade lamp, what to apply for this? On the Internet there are many different power supplies for 600V, 1000V, 2000V, 3000V.
The first: on high voltage is used by diagrams with transformers both per phase and three phases (if there is a three-phase voltage source in the house).
The second: to reduce dimensions and weights, use a tranquilantiform power scheme, directly network 220 volts with multiplication of voltage. The greatest drawback of this scheme - there is no electroplating alert between the network and the load, as the output is connected this source Voltage observing phase and zero.

The scheme has an increase in the anode transformer T1 (for the desired power, for example 2500 VA, 2400V, current 0.8 A) and the downgrade transformer T2 - TN-46, TN-36, etc. To exclude current shots when turning on and protecting Diodes during the charge of capacitors, the inclusion of the resulting resistors R21 and R22 is applied.
Diodes in high-voltage chains are underlined by resistors for the purpose of uniform distribution of UEBS. Calculation of the nominal formula R (OM) \u003d Pivx500. C1-C20 to eliminate white noise and reduce impulse overvoltage. KBU-810 bridges can be used as diodes by connecting them by the specified scheme and, accordingly, taking the right amount without forgetting about the shunting.
R23-R26 for the discharge of capacitors after disconnecting the network. To equalize the voltage on sequentially connected capacitors, leveling resistors are put in parallel, which are calculated from the ratio for every 1 volt accounts for 100 ohms, but high voltage Resistors are sufficiently high power and here you have to be lavailed, considering that the idle stroke voltage is 1,41.

Even on the topic

The transformer power supply is 13.8 volts 25 A for the KV transceiver with their own hands.

Repair and refinement chinese block Power for power adapter.

Details

Diode Bridge at the inlet 1N4007 or the finished diode assembly designed for current at least 1 A and reverse voltage of 1000 V.
Resistor R1 at least two watts can also be 5 watts 24 com, resistor R2 R3 R4 with a power of 0.25 watts.
Condenser electrolytic on high side 400 volts 47 μF.
Output 35 volts 470 - 1000 μF. Filter Capacitors Calculated for voltage at least 250 V 0.1 - 0.33 μF. Capacitor C5 - 1 NF. Ceramic, C6 Condenser Ceramic 220 NF, C7 Film 220 NF 400 V. Transistor VT1 VT2 N IRF840, transformer from the old computer power supply, diode bridge At the outlet, a full of four ultra-best diodes HER308 or other similar.
The archive can download the scheme and fee:

(Dropping: 1157)

The printed circuit board is made on a piece of foil one-sided glass fiberstolite by the LUT method. For convenience of connecting power and connect the output voltage on the board there are screw terminals.

Pulse power supply diagram 12 V

The advantage of this scheme is that this scheme is very popular in its kind and it is repeated by many radio amateurs as their first impulse power supply and efficiency, and once again, no longer speaking. The diagram is powered by a 220 volt network voltage in the input is a filter that consists of a throttle and two film capacitors calculated for a voltage of at least 250 - 300 volts with a capacity of 0.1 to 0.33 μF them can be taken from a computer power supply unit.

In my case there is no filter, but it is desirable to put. Next, the voltage enters the diode bridge calculated on the reverse voltage of at least 400 volts and a current of at least 1 amp. Can and put ready diode assembly. The further scheme is a smoothing capacitor with an operating voltage of 400 V, since the amplitude value of the network voltage is in the area of \u200b\u200b300 V. The capacity of this capacitor is selected as follows, 1 μF per 1 watt of power, since I'm not going to dig up a large current from this block, In my case, there is a condenser at 47 μF, although it is possible to pump up one hundred watts from such a scheme. The meal of the chip is taken from the change, the power supply is organized here. The resistor R1, which ensures that the current is desirable, it is desirable to put more than two watts that is heated as it is carried out, then the voltage is rectified with only one diode and enters the smoothing capacitor and then on the microcircuit. 1 Chip output plus power and 4 output is minus power.

You can collect a separate power source for it and apply according to the polarity of 15 V. In our case, the microcircuit operates at a frequency of 47 - 48 kHz for such a frequency of the RC chain consisting of a resistor R2 15 com and film or ceramic capacitor per 1 nf. With this scenario, the details of the microcircuit will work correctly and produce rectangular pulses on their outputs that enter the shutters of powerful field keys through the R3 R4 resistors. Renses of them may deviate from 10 to 40 ohms. Transistors It is necessary to install N channels, in my case cost IRF840 with an operating voltage of the flow of the source 500 V and the maximum flow current at a temperature of 25 degrees 8 A and the maximum dispersible power of 125 watts. Further according to the scheme pulse transformer, after it is a full-fledged rectifier of four Her308 brand diodes, ordinary diodes do not fit here as they will not be able to work at high frequencies, so we put the ultra-free diodes and after the bridge the voltage already enters the output capacitor 35 volts 1000 μF, it is possible to 470 microf Large containers in pulse power blocks are not required.

Let's go back to the transformer, it can be found on the boards of computer power supplies, it is not difficult to determine here it is not difficult in the photo the biggest here it is necessary for us. To rewind such a transformer, it is necessary to glue the glue to which the halves of ferrite are glued, for this we take a soldering iron or soldering hair dryer and slowly warm up the transformer, you can lower in boiling water for several minutes and gently disconnect the half of the core. We chat all the basic windings, we will wink your own. At the calculation of the fact that I need to get a voltage in the region of 12-14 volts, the primary transformer winding contains 47 turns with a wire of 0.6 mm in two veins, we make isolation between the winding of the usual scotch, the secondary winding contains 4 turns of the same wire in 7 live . It is important to carry out the winding in one direction, each layer isolate with a scotch, noting the beginning and the end of the windings otherwise it will not work, and if there is a block then the unit will not be able to give all the power.

Block checking

Well, now let's test our power supply as my option is fully working, I immediately connect to the network without a safety lamp.
We will check the output voltage as we see in the area 12 - 13 in not much walking from the voltage drops on the network.

As a load car lamp At 12 in a capacity of 50 watts, the current is respectively 4 A. If such a unit is supplemented with a current and voltage adjustment, put the input electrolyte of greater tank, then you can safely collect charger For auto I. laboratory block Nutrition.

Before starting the power supply, you must check the entire installation and turn on the network via an insurance lamp of incandescent 100 watts, if the lamp is full of intensity means looking for errors when installing the nozzles not washed flux or no one component and T d. With the correct assembly, the lamp should be slightly To flare and go out, it says to us that the condenser at the entrance has been charged and there is no mistakes in the montage. Therefore, before installing the components on the board, they must be checked even if they are new. Another one is not enough important moment After starting the voltage on the chip between 1 and 4, the output must be at least 15 V. If this is not so selecting the R2 resistor rating.