Re: OT: LEDs for amp channel switching

[Douglas Baldwin <coyotelk@optonline.net>]

> Are these latching or momentary switches?

Latching. Big humongoid chrome-plated latching stomp switches. The kind 
that
give off a moderate "click" when you step on them, and you can feel it 
click
in your foot bones. The old Fender-style "reverb and vibrato" type 
switches.

> >Hi Crew-
> >     This is way OT, but I'll bet one of you loopers just might be the
DIY
> >brainiac to solve my problem.
> >
> >I just purchased a Carvin V3 amp head - great sounding 100-watt EL34
> >monster, by the way - but the channel-switching footswitch has no LEDs 
>on
> >it. There are three channels plus a "boost" function, and all four
> >footswitches are simple SPDT switches with one lug unused. I figure it
would
> >be fairly easy to swap the SPDTs for DPDTs or, if necessary, those 
>groovy
> >Fulltone triple-throw DT switches, drill holes in the switch housing, 
>add
> >LEDs and a 9V battery, and I'd be rocking.
> >
> >The problem is, I can't find a schematic that would cause just one
channel
> >light to be on at a time. I'm boggled about how to wire it so that if,
for
> >example, I'm using Channel 1 and want to change to Channel 2, when I
press
> >switch #2 (for Channel 2), the LED for switch #1/Channel 1 goes off and
the
> >LED for switch #2/Channel 2 goes on. So among the three channels, only
one
> >LED can be on at a time. The 4th (boost) switch would remain on or off
> >regardless of which channel is on (that one's easy).
> >
> >     I spent about an hour the other night doing Google searches on all
kinds
> >of guitar and amp DIY sites, and I checked my Craig Anderton books, and 
>I
> >couldn't find anything for this other than to get into some kind of 
>solid
> >state switching chip, which I'd rather avoid. It SEEMS like it would be 
>a
> >simple enough circuit WITHOUT any chips or boards, but I don't do this
kind
> >of thing often enough to figure it out for myself.
> >
> >HELLLLLLLPPPPP!
> >
> >Douglas Baldwin, coyote-at-large
> >www.thecoyote.org
> >coyotelk@optonline.net
> >
> >"Life! Life!
> >Clouds and clowns!
> >You don't have to come down!"
> >- Sly and the Family Stone
>
>
> -- 
> ...
> http://www.zmix.net
>