I tell you I have an old cassette radio that does not turn on and apparently I think that it is the source inside the case there is a board that contains 2 chips, one of amplifier and another of radio am / fm. I connected speakers to the amplifier chip and injected sound, gave it voltage and it worked only that it did not control the volume or anything. NOW what I want to do is if with this logic I can also make it work to the am / fm chip by placing some speakers giving it the voltage it requires and make it work will it be possible ???? And finally, if it were to work, could they work together? each with its voltage that of the 9v amplifier and the other with 3v out there I hope you can help me because the cassettes and all that is the least I know little electronic I hope you can guide me these are the am / fm chips TA8127N and ka2206 amplifier