Power switch causes loud pop

[Outlaws]

I just build a nice breadboard that has a power switch and will eventually have a bypass toggle and some other stuff, but for now I jsut have the power switch hooked up.  When I turn the power on and off I get a LOUD pop.

My grounds are all connected to the distribution bus on the BB.

What could be the cause of this?  Is it fixable?

[toneless]

There is an interesting and usefull article about those ugly "POPS" over at geofex.com.

I don't know what schematic you are working on but you may need to use a 4.7M resistor from the input to ground. Reed a few things, experiment and you will actually throw away your little "bug".

Make a search at the forum, too! There are a lot of thread with this subject.

[petemoore]

The first advice I can give is what you already probably figured out, attenuate or cancel the output signal chain to save amp/speaker/ear from 'seeing' this POP.
 I think it's pretty common for this to happen, always did for me, I don't know of a cure for it.
 You mentioned bypass switching also, I'm talking about disconnecting/connecting PS.

[R.G.]

Unless you are using a balanced plus-and-minus power supply, the circuit itself has to internally charge up to the proper bias voltages every time you turn on the power. In particular, for a single-voltage power supply, the input and output caps have to charge to about 1/2 the power supply voltage. This is a huge transient, and there's really no effective way to eliminate it except possibly manually holding the output shorted to ground until the innards of the circuit have stabilized.

The pop is an inherent consequence of using a power supply switch only and no bypass switch. Don't sweat it until you get that bypass switch hooked up. This problem is a consequence of your breadboarded setup and will not plague you when you get it into a proper box.