Getting rid of pop due to switching battery in and out.

[Ptron]

I have a PT80 delay pedal whose primary function is to eat batteries so  I've used a 3PDT switch to disconnect the battery when the effect is switched off. It works fine except that as you might imagine, it sometimes pops pretty good when I switch it on or off. Is there a simple way to get rid of or reduce the pop? (please don't say "use a wall wart" , I need this thing to run on batteries) All told, the pop is better than getting only 2 hours out of a battery but it would be nice to do something about it.

Ptron

[Mark Hammer]

See "Pop filter, reverse polarity protection and power filtering" thread above for some ideas.

[Ptron]

It already has 1M resistors to drain charge on the input and output caps so I don't think that's the source of the problem. I think the it comes from switching the battery in and out.

Ptron

[petemoore]

  Other than voltage 'ramping' up the V+, which is beyond my scope of undestanding as far as applying it to do what you want it to...
  If there's a way to hold the output at ground until after the 'instability' passes after switching I/O the power supply, a simple switch would do it, but it'd be user dependant, perhaps a momentary switch to ground the output during/after PS Switching, that'd do it...
  There's probably a way to quiet the PS Switching or ground the output 'during'..generally it's 'not done' probably because of the disadvantages of cost, complexity...at that point it's easier to just get away from using a battery...see I almost didn't say Wall Wart...

[gez]

Difficult one!  The only thing I can think of is what a lot of hi-fi amps do, mute the output for a short time until things have settled down.  Usually done with a relay...possibly PIC controlled...all these things are going to add to the total current drain though, so might be a false economy. 

Probably a simpler way to do the above, but too tired to think straight.

I don't know the circuit, but if there are actives other than the delay chip that can be replaced with low power devices, i.e. op-amps (ICL7621 is a good sub), it all helps (though probably won't make that much difference). [/ramble]

[gez]

The only thing I can think of is what a lot of hi-fi amps do, mute the output for a short time until things have settled down.  Usually done with a relay

Hmmm, probably wouldn't work if the circuit output isn't at ground potential.  Ignore my drivel.

[gez]

The only thing I can think of is what a lot of hi-fi amps do, mute the output for a short time until things have settled down.  Usually done with a relay

Hmmm, probably wouldn't work if the circuit output isn't at ground potential.  Ignore my drivel.

Hmmm, might work...I need to go to bed! 

[RDV]

See wall-wart and skip the switch. Yeah I know what you said.

RDV