I built a 2 channel lm1875 amp and when I turn it off it makes a popping sound. I've tried a bunch of different grounding schemes to no avail (currently star grounded.) It makes no difference as to what the volume is set at as to how loud the popping is.
You didn't say which type of power supply your amp is using. A single supply has a few capacitors that must charge then discharge. A split supply has much less chance of causing on-off popping.
Good point, this supply has 4 MUR860 diodes, into two 1500uF caps, the a couple 0.1uF caps and some 1ohm resistors. It gives me +/-23.6 volts. I'm running it on a center tapped transformer I pulled from a non working CB base station.
Do you have the 1 ohm & .22uF cap at the output? If that is not helping, the data sheet recommends 10 ohms in parallel with 5 uH, all in series with the load.
Yeah, I have those. I might try your suggestion, but probably not. It'd be more pain than its worse. It barely pops, just enough to be noticable. Thanks anyway.