I didn’t have a printed circuit board for it and decided to assemble it on another board from a radio receiver, where there was a microcircuit that has 16 legs. And so, first we remove all the parts from the board, then carefully remove the microcircuit so that the tracks remain intact. We install the TDA7496SA (it has 15 legs) in the place where the micro from the receiver stood. You'll have to tinker a little, because the paths go in different directions. The microcircuit body must be connected to the minus.
And of course you can’t leave it without a radiator, otherwise it will heat up very quickly and may fail. As for the transformer, I took it from an old power supply and the output is 21.22 volts and no less than 0.6 amperes. If the voltage is somehow below 16 volts, you will have to install 220 uF capacitors at the output, otherwise the sound quality will be worse than we thought.Follow the amp, the same is very important. If it is more than 22 volts, then you can replace it with 470 uF and 1000 uF and then there is no point.
Here I have already placed the board in the housing from the old doorbell. The transformer did not fit and I decided to assemble it separately with a diode bridge. For the audio input, I installed a headphone jack and I think it cannot be replaced with anything, and the same is true in other devices. It has three terminals inside, one is a general minus, and the other two can be said to be pluses (this is for a stereo system).
And for audio output I decided to use a jack from a DVD, or from a TV. For power supply I installed a socket and plug from an old electrophone from the 70s. These things can also be found in old televisions and tape recorders.
As for the diode bridge, when I assembled it on the KD202 they showed the worst side, the sound was not clear, although these diodes are used in audio equipment. I installed D226 and there are no problems. I decided not to show the power supply because she was the size of a fist. Any self-respecting radio amateur has the same D226 diodes.
This is a ready-made amplifier. Capacitors must be placed after the diode bridge of at least 1000 microfarads. Try to at least connect two of these in parallel. The more capacitors, the less noise (background) of alternating voltage will be, and this is very important for high-quality and clear sound. I wrote all this for beginners...
