Re: OT: LEDs for amp channel switching

[Douglas Baldwin <coyotelk@optonline.net>]

> Is this the "FS44" you are using?
Yup.

> Are the switches unique for each selection or are they set up as A/B
switches?
I believe they're unique for each selection, with some kind of logic 
circuit
in the head doing the actual routing.

>   when you switch from channel one to channel two do you need to
> deselect channel one?
No. I just stomp on the appropriate switch and the channel switches. Two
stomps for a change of channel would be pretty unergonomic. Or maybe the
word is "dumb."

> 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
If you say so. Doesn't sound too hard. Got schematic?
dB

> >  > 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
> >>
>
>
> -- 
> ...
> http://www.zmix.net
>