gres
Full Member level 4
Welcome
Recently fall into my hands Tonsil SD-409 headphones, after plug to stereo system can play very well. But they can’t work with PC, cell phone or mp3 player, because of resistance 600ohm.
I searched thought a lot of diagrams of headphones amplifiers and decided that TDA2822m is the best one for me.
Amplifier can be powered by 1.8-15V voltage, current takie is about 40mA
Power source in this case is 9V/200mAh accumulator.
I hate solder spiders, system I’ ve built on small universal board ( I didn’t edge for a few elements)
Under the board you can see laminat, that I add after finishing as a screen, I really ticks me off when I heard buzzing noise after touch board from bottom. That small part have eliminated the problem.
Board is tight by nuts to screws, that I glued by double- unit glue for laminate, - it grab really strong.
Biggest fault that I found : hole for small jack is for about half millimeters higher then others – but this is not a serious problem I think ?
Original text comes from https://www.elektroda.pl/rtvforum/topic1518351.html
Diagram from catalogue notes: