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Re: OT: LEDs for amp channel switching



Is this the "FS44" you are using?


Are the switches unique for each selection or are they set up as A/B 
switches?

  when you switch from channel one to channel two do you need to 
deselect channel one?

I think that if you were to arrange the LEDs in series and use a 
diode matrix to determine which LED was lit for which combination you 
could get it working

>  > 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
>>


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