Re: OT: LEDs for amp channel switching

[Charles Zwicky <cazwicky@earthlink.net>]

Are these latching or momentary 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


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