I have a nasty yellow rotary telephone which I decided to convert to an internet telephone thingy via 2 headphone jacks. I didn't detatch any of the leads from the terminals on the telephone board, rather I just piggy backed the jacks onto the existing connections. It works fine, however if I connect the headphone function to my speakers, and turn up the volume past a certain point (not very far), I get a whine akin to a theremin or sythesiser which can be varied by the volume control knob, when left alone it leaves a steady tone.
I'm sure this is easily solved, I'm not bothered how to fix it. I just want to know why it happens.
Incedentally, I made a recording of this strange noise. I'll send it to someone if they want to host it (~500kb zipped wav, 20 secs)
I'm sure this is easily solved, I'm not bothered how to fix it. I just want to know why it happens.
Incedentally, I made a recording of this strange noise. I'll send it to someone if they want to host it (~500kb zipped wav, 20 secs)