I think this is a good idea?

[ambulancevoice]

well, i got a schematic recently, and it explained the 3pdt switching it used
now, these days we use 3pdt with one spdt section for an LED indicator
well, on the schematic, the LED power indicator was wired to the power supply
BUT
the spdt section was not used to cut it off
it was used to cut the power instead, turning off the led and cutting the power

how does that sound to you???...

[birt]

depends on the circuit. some effects have a really really short time to start working after you give them power, some will take longer and you will hear this after you switch it on. some even make strange sounds :p

[bkanber]

Yeah, back when I first started doing pedals, I wired a couple of 3PDT switches to switch power as well as bypass. I've never had a major problem with it, but in general it's a better idea to switch power with the input jack. As birt said, some effects take a little time to "warm up" (ie, charge capacitors and stuff). Also, if things aren't grounded properly, you can get popping when you switch the effect on.
So I'd say just go for the wiring you're used to: switching power with the jack and only the LED with the switch. That's the widely accepted method.

[gez]

Personally, I'd never do this.

Think about most circuits we build here (running from a 9V supply).  Firing up from being off, their outputs tend to bias at around half supply.  From 0V to 4.5V at the output in a fraction of a second.  In AC terms, that 4.5V rise gets coupled through the output cap and charge drains off via the pulldown resistor/load on the other side of the cap until the potential (on that side) is 0V again.  This momentary spike can/will be perceived as audio noise. 

It's why decent hi-fi amps have switching to the speakers to mute them while the amp 'settles in'. 

[ambulancevoice]

well, in that case, someone should contact LAL (Lastgasp Art Laboratories) and tell them not to use this method...

[gez]

well, in that case, someone should contact LAL (Lastgasp Art Laboratories) and tell them not to use this method...

Perhaps there's more to their circuits than you think.  As I mentioned above, it's possible to do this if you momentarilly suspend audio out via switching (often relays in hi-fi due to the large currents).  Various project magazines have used PICs (amoungst other things) to control said switching.  Then again, they could just be a bunch of clueless f*****s. 

Can't say I've ever heard of them.  Where did you get the info from (link)?  Might clear things up.

[ambulancevoice]

well, in that case, someone should contact LAL (Lastgasp Art Laboratories) and tell them not to use this method...

Perhaps there's more to their circuits than you think.  As I mentioned above, it's possible to do this if you momentarilly suspend audio out via switching (often relays).  Various project magazines have used PICs (amoungst other things) to control said switching.  Then again, they could be a bunch of clueless f*****s

Where did you get the info from (link?).  Might clear things up.

nope the schematic is just opamps and shit
its for a resistive filter or something
Rattle Crow its called
http://lalweb.com/rc/rc-e.html

[gez]

Well, they've got a website on the internet so they must know what they're doing...( )

Edit: There might be some quirk of the circuit that allows them to get away with this.  Who knows.

[mnordbye]

Anyway, it sound wicked! The sound samples on the website are hilerious..