Got a laptop with stereo output and an amplifier with built-in speakers (9V battery-powered) mono input. Can I solder the two channels together in the jack plug for the mono signal?
I wanted to do it once, but my father advised me against it.
The headphone output from the laptop has an amplifier, which can damage it. That depends on how it's set up. He couldn't care less, but I wouldn't risk it.
He wanted to put two resistors in between, but I just don't remember how many ohms.
Just buy an adapter for 5 euro and save yourself soldering.
This is done by not soldering both channels directly, but instead each connected to a mono with an electrolytic capacitor.
I suspect that this has already happened in the socket of the amplifier. Take the test:
Create a separate audio file for each channel. Once with the signal only on the left side, once only on the right side. Play the files using a normal adapter. If both audio files can be heard at the same volume, then both channels are already switched together in the input.
