Amplifier for 500 rubles. Do it yourself

    It has long been, I decided to write just now.

    S-30B speakers were available.
    I wanted to make home acoustics to my computer. Not enough amplifier.

    I went shopping. The lower price of low-power amplifiers / receivers (30 watts speakers at the peak) is about 6,000 rubles.
    I decided to do it myself.

    Let's get started.

    Tube - for audio files, and a lot of problems. Transistor - it takes a long time to configure, and the element base must be selected precisely, because the errors in parts sold in markets and in stores sometimes reach 10%.
    As a result, the choice fell on the microcircuit.
    Googling and reading the forums, I chose the TDA2050 chip.

    Inclusion scheme:

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    As you can see, the body kit is minimal.
    They also need radiators.

    He took 500 rubles. and moved towards the radio markets and shops.

    The entire elemental base cost a little more than 100 rubles.

    A power source was also needed. I will not delve into the details of nutrition. Diode bridge + output Conder - another about 100 rubles.

    I bought radiators on the market from the old first stump 2 pcs for 20 rubles.

    + I bought more stuff, which will be below.

    Returned home. It is necessary to make signets. I decided not to bother for a long time. He took a piece of textolite from the bins, marked the tracks, drew them by hand with a marker, which is in the photo below.

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    Etched with ferric chloride (again I got it from old stocks).

    I decided not to drill the seal, but to solder the parts from above onto the tracks.

    To the power supply a little more responsible. Here he still drilled a textolite, because the condors are large and if you solder them from above, you get a mechanical load on the copper foil big, it can peel off. Well, + stabilizers for + -12 volts just in case, for the future I attached a transistor with a resistor on conventional zener diodes +.

    About the transformer a bit later.

    All connected by a canopy. Connected a sound source and speakers. Poper self-excitation. Beeps and that's it. I soldered straight to the feet of the food mikruh film Conder 100nan. Excitement is gone. I drove an hour - it works.

    Now the case.
    The old Vega 10U-120S was lying around (of which there was a transformer).

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    He threw everything except trance out of him.

    I cleaned it from silver, put a plate on the front panel. I painted everything (the usual paint from the spray mat remained).

    Here's what happened (I did it about 2 years ago, so it’s already worn out): I

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    plugged the power supply into the place of the 2 conders that were there:

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    The volume control is a regular 2 kilo-ohm variable: I

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    fastened the amplifiers to 1 bolt. They are lightweight, so they hold on reliably: I used to

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    buy a knob for 10 rubles at one time:

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    Wires for an audio signal: I bought 2 meters of a microphone cable for 30 rubles a meter.

    Everything began to look like this:

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    On the back wall of the input jack and terminal output.
    Twisted. Connected a computer and speakers. Everything worked right away and without complaints.

    I am not a big fan of sound. In my opinion, it plays no worse than what is sold in a store at a price of 6-10 thousand rubles. But it was definitely better than it was when there were native offal in this amplifier case. The skyscrapers appeared normal, the bass more or less erupted. It was probably bad because of the dried up old Conder in the old giblets.
    In general, after it was all ready, 30 rubles were left from 500 rubles. All this taking into account the passage from stores to stores.

    After some time, I took a Magnat Monitor Sub 200 A subwoofer (then it cost me 5,000 rubles). But this is a conversation about acoustics and another topic.

    Since then, I have never complained about the sound. Everything works flawlessly. Enough for background music and for films and for parties, so that the neighbors listen.

    ps This story was a long time, so some in the moments could lie a little.

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