amplifier
I have a headphone amplifier schematic and I want to make it in stereo. My questions are:
Thanks, Tamas
Amplifier:
Power supply:
I think, before over-complicating stuff with an op-amp, try this: -
It could be that the short circuit detection is using DC to decide whether it is shorted. The dc blocking caps shown are 10uF and in case these do not allow enough bass, be prepared to raise their value to 47uF.
You might also need to have bleed resistors from each input line to shield just to activate the output - try 10k on these.
Hmmm the precision of an analogue pot eh? Compared to the digital nature of a 15 watt digital class D amplifier. So be it.
Lowest input impedance of the chip will be at max gain and this could be as low as 9kohm so use a 1, 2 or possibly 5k pot on the input - wiper to chip and pot low end (CCW) to 0V. Input from external input to pot CW pin. Stereo pot of course.
Here's the data sheet for reference.
Best Answer
This is a Class A amplifier - the output transistor is always conducting until the amplifier reaches negative clip.
It doesn't have much output power and worse yet, the amount of available negative current becomes less as the amp output swings negative.
It should drive headphones just fine but that's about it.
If you want to use a pair of these as a stereo pair, you will want to use an audio-taper dual pot for the volume control.