Two-band debate. Powerful and high-quality homemade sound amplifier Three-robes hammerblocks do it yourself

The debt is used to align the amplitude-frequency characteristic (ACH) low frequency amplifiers. As many unch possess nonlinear characteristic In various frequency ranges: in the low and high frequency range, the gain coefficient is much worse than in the middle-frequency interval. Therefore, for high-quality sound reproduction, it makes sense to use special modules - "Tembloclocks", with which you can adjust the audio signal throughout the range spectrum.

In essence, it is a range of range filters that control the cutting depth in a given frequency range is not a touch of LC and RF frequency and therefore the ACH amplifier is aligned, but at the same time the amplitude of the input signal is reduced slightly, and additional gain may be required. Thus, the timbre settings modules can be divided into two classes: passive (ACH adjustment only) and active (ACH adjustment + amplifying cascade for compensation)

This template design loosens a signal in the average frequency range somewhere 10 times, and therefore it is placed between two amplifiers - preliminary and terminal.

The selection of radio components depends on the resistance of the RC signal source and the load of RN (the input resistance of the next amplifying cascade). We implement the calculation of the ratings of radio elements: variable resistors always take the same with the condition:

R C.

The remaining components are calculated by simplified formulas:

R1 \u003d R4 \u003d 0.1R; R3 \u003d 0.01R; C3 \u003d 0.1 / R; C1 \u003d 22C3; C2 \u003d 220c3; C4 \u003d 15C3

The transistor in the device is used to compensate for the signal loss. Special requirements are not presented to it, it is even possible to take a morally obsolete KT315.

I want to immediately say that this tone regulator can boldly fumbled with those that are used in modern audio engineering, its scheme was copied from a radio amateur magazine, but now I do not remember what exactly. One exactly I can say this design of the temptercycle satisfied as an elephant

Exterior view of the radio amateur construction and placement of components on the printed circuit board, see in the figure at the top of the page

Here are the schemes of passive timbres of the well-known world brands of guitar electronics, such as Fender, Marshall and Vox. From the simplest with one regulator to more complex three-track.

VOX AC30.

Such a simplest design allows only a high-frequency tank. It is used in the simplest lamp combo.

Fender PrinceTon.

Using the Chapel of the Fender Princeton, it is possible to produce as lifting and high frequency lift.

Marshall 18 Watt.

This debate can be touched into the low and high frequency.

Vox Top Boost.

This timbre regulates both high and low frequencies.

Below are several well-known scheme rates - two-pole: Fender "Brownface" Bandmaster 6G7, Ampeg Svt, Marshall JMC800 Mod.2001

From this Trinity the timbres each individual and good in its own way. What to be detonated to you and make the final choice of a unambiguous answer does not exist. There yourself, experiment, the schemes are not complicated and easily repeated by mounted installation or on the dumping board.

For the purity of the article, I will also give the scheme of three-track rates. IMHO the most popular among all radio amateurs.

These brand guitar structures allow you to regulate low, medium and high frequencies. Marshall gives a more weighty sound than the gravestone of FENDER. Below are the ratings of radio components in various variances of these schemes.

The collector or equalizer is a node that is responsible for a cut of one or another frequency in a low-frequency power amplifier. With it, it is easy to cut low, high or medium frequencies, thus setting the amplifier sound under your taste. The device has been widely used and implemented almost in all profuff. Amplifiers can also be completed separately.

Today we consider one of the designs that can work together with any low-frequency amplifier, also automotive.

The collector is active, therefore there is a separate enhancing element, which in principle can be any. The amplifier in such schemas is needed for the final gain of the signal after processing, since the value of the initial signal is greatly reduced (weakens). The amplifier can be built on both the UNG specialized microcircuit and the OU, but in our scheme as an amplifier is a simple scheme on one transistor.

This amplifier can eat from 12 volts, it makes the universal scheme and makes it possible to use in the car. The transistor should choose with the highest gain (HFE). You can use low-power transistors both composite and ordinary. In my embodiment, the BC546 transistor is involved, it is not fundamental, it can be replaced by any other NPN transistor with the corresponding parameters. In my version there are regulators for LF / RF and volume.

Capacitors in sound circuits are advised to take a film, but the scheme will work perfectly both with usual and with multi-layer ceramics. The printed fee decided not to do, limited himself to the macate circuit board.

Variable resistors are the most common, their resistance can be from 10 to 68k, in my version all resistors on 10 com. The design ultimately placed in the housing from the universal pulse adapter, it approached well in size.

A low-power network transformer from a Chinese radio receiver is involved as a power source, the output produces a voltage around 12 volts, after rectifier, the voltage is already about 16 volts.

The housing drilled the holes for input / output, regulators and a power toggler, it turned out not very good, but it will work.

The scheme coped with its task very well, it does not even feel that a primitive unit works with zero costs. At the expense of costs - they are really zero, all that is used here can be found in the old chemge.

Currently, MP3 players with built-in flash memory are very popular, these are very miniature digital individual audio reproduction tools that run on headphones.

Many of them befunctioning of the playback of audio files recorded in them through a personal computer have built-in VHFM or multi-band digital receivers and sound records both from the built-in microphone and from the built-in radio.

Practically, -audiocenter size with thimble. One problem, they only work on headphones. For high-profile playback, additional external UHCs and acoustic systems are needed.

Alternatively, it is possible to use active "speakers" for a personal computer, but inexpensive "computer columns" are usually not familiar with the concept of "sound quality", and better and more expensive are more expensive.

Schematic diagram of UNG.

A scheme of homemade very budgetary stereo-unch is given here with quite a decent sound quality (at the level of an inexpensive stationary compact music center). A two-channel amplifier, which issues 6W to the channel under the book at a frequency of 1000 Hz no more than 0.6%. Maximum power 9W per channel.

In the amplifier there are analog tone controls on the LF and HF, the volume control and stereo balance. When working, you can use both them and the control source authorities (MP-3 player).

Uncle's input resistance is relatively large (100 kΩ), therefore, if the signal is supplied to the Uncle input not from linear, and from the MP-3 player's telephone exit, you may need to create the equivalent of the headphones to load a telephone source of the signal source. This can be done in parallel to each input of this UNH one by one resistance of 30-100 ohms.

These resistances will play the role of coils of headphones. However, the load equivalent may not be required - it all depends on the circuit of the output cascade of the telephone amplifier of a particular model of MP-3 player.

Fig. 1. The schematic diagram of the LF amplifier on the TDA2003 for a smartphone or player.

Uncle scheme is shown in the figure. It is based on two TDA2003 chips. These are integral umzch, similar to microcircuits K174UN14.

Practically, the TDA2003 microcircuit is a powerful operational amplifier operating with unipolar power, and its gain is determined by the OOS circuit parameters included between the inverse input and output. Here is the same. In particular, the amplification coefficient can be changed by the selection of resistance R18 or R22 (for another channel).

This may be required to adjust the gain at a specific signal source (change in sensitivity), as well as if necessary, to exhibit the equalization of sensitivity in the channels (for example, taking into account the acoustic furnishings of the room, where this unch will work). However, to adjust the reinforcement ratio in the channels there is a sterea balance regulator on a variable resistor R8 which is adjusted by the ratio of the shunting of semi-resistors of the dual R7 (volume controller).

The input signal comes through two connectors L and R. These are "Asian" connectors. To connect to the output of MP-3 player, you need to make a cable - at one end the corresponding telephone plug, on the other two "Asian" plug. From login, the signal enters the passive regulation scheme.

First, the tone controller on RF (R1) and LC (R6). Then the volume control on the dual variable resistor R7 and the sterea balance regulator R8.

From the adjustment scheme, the channel signals come to two UMPs on the A1 and A2 chips.

Power supply

The power supply is transformer, on a low-frequency power transformer T1 type 109-01AF11-01. He has a primary winding by 220V, and the secondary 26V and current 2,2a with a tap from the middle part. The removal forms the midpoint (GND).

Because there is a removal from the center of the secondary winding, the diagram of the rectifier was decided to make the two-speaker circuit on two diodes VD1 and VD2.

Fig. 2. Scheme of the power source for the homemade LF amplifier on TDA2003.

The source is not stabilized. You can use another transformer with similar parameters. If there is one winding by 11-13V, the straightener will need to make a pavement on four diodes. You can feed from the finished source, a constant voltage of 12-18V at a current not lower than 2 A, for example, from a power unit of some computer peripheral or office equipment.

Finally

Acoustic systems contain two dynamics - one medium-frequency (broadband) 25W resistance of 4 ohms, and one high-frequency power 15w and an 8 ohm resistance. The high-frequency speaker is connected through the C13 condenser (C14), which, together with the resistance of the high-frequency dynamics, forms the simplest Filter of HF.

Broadband speakers FD115-7, high-frequency FDG20-1 types. In principle, other acoustic systems can be used, setting parameters - maximum power not lower than 10W, 4 ohm resistance.

When the microcircuits are heated, so they need heat sink. Radiators can be made of galvanized metal profile, which is used to assemble the frames of plasterboard designs (ceilings, partition). For each radiator, you need to cut off two pieces of 20-25 cm long.

Then one of the pieces cut along two the same parts in the form of two corners. Further, two corners fold the "intelligence" and placed in the middle of a whole piece. All mating surfaces need to be labeled with heat-conducting paste.

In the middle of the design, the hole is drilled where the microchip is fixed.

The diagram of the lamp timbre for the amplifier is based on the LM1036N controlling the volume and balance in the car radio. An additional control input allows you to simply simply apply the volume compensation.

All that you need for the assembly with your own hands of the damble on the transistors is LM1036N, 15 capacitors, several fixed resistors and several potentiometers. As a result, you will receive a quality device for controlling the volume and other sound parameters.

Step 1: Basic Information

The scheme I used is given in the manufacturer's technical passport: Link

Look at page 6.

The scheme works just fine, so if this is your first experience - use this, it will work perfectly, unless you spoil the items.

You will need:

• LM1036N.
• 47 μF x 1
• 0.47 μF x 2
• 0.01 μF x 2
• 0.22 μF x 4
• 0.39 μF x 2
• 10 μF x 2
• 10 μF x 1
• 47K resistors x 4
• 47K potentiometers x 4
• Switch X 1.
• 3.5 Audio Jack Connectors (Mom and Dad) (size can be any)
• Cable (use inbox protected and outgoing)
• Empty fee to which you will succeed
• Soldering iron and cutting tools
• Plastic housing
• Buttons for potentiometers

All about everything I spent about 1000 rubles.

Step 2: Experiment

I started with the assembly of the scheme on the batch. It is very convenient if you are new to and are not sure that everything will immediately work out, but keep in mind, you should not particularly trust simulation. When I did tests, there were quite a lot of noise in the audio signal.

You can skip this step and immediately get to the soldering, if you are sure that you will succeed.

I want to note that to check the incoming signal I used my fingers. When you touch the plug, there must be a bad sound, similar to noise. Unscrew the potentiometer that is responsible for the volume to the maximum if you do not hear any sound, then you should not connect your phone, as there may be a short circuit in the diagram or just something is not so connected.

Note: All electrolytic capacitors must be connected correctly. They have a marking on one of the sides (most often on the negative), spend a little time to deal with it.

After I heard the noise in each of the channels, I connected my phone and turned on the music, checked all the buttons and listened to the difference in the sound.

Another point is the output signal. I used ordinary headphones. If you use cheap, you can not notice a special difference in the settings.

Step 3: We make a scheme

In the first photo, I soldered most of the components. Try to install capacitors as close as possible to the chip, as this will reduce the length of the tracks and minimizes the noise. It will also help when choosing a case, it will be less and the fee in it will better fit.

In the second photo you can see the finished scheme with output cables soldered below. Yellow and red - channels, black - grounding.

On the third photo you can see small input cables. They go from old headphones, in which there are 3.5 mm connector, which means it should not be soldered.

Step 4: Make Case

Most likely, you want to set the potentiometers on one side of the box. I used the plastic housing in size of my board. He drilled four holes in front to cover through them the axis of the potentiometer, which are delayed on a small plastic part inside the housing.