Willen
Well-Known Member
Recently I build an audio amplifier (schematic attached) based on TDA2822 8 pin DIP. But it's generating a kind of loud noise like "TaDat! TaDat!! TaDat!!!......" frequently twice or thrice in a second, almost louder than audio output. +5 volts is supplied by laptop USB and audio source is same laptop's headphone output.
It's amazing that it works so nice if I used same USB supply (from laptop) but my cellphone as audio source. What could be the reason and what can I do for further calibration?
Here's what I made exactly- (attachment)
It's amazing that it works so nice if I used same USB supply (from laptop) but my cellphone as audio source. What could be the reason and what can I do for further calibration?
Here's what I made exactly- (attachment)