ABC box wiring?

fixr1984 · August 27, 2006, 09:23:10 PM

Im trying to make a ABC box. What it would be is an input and 3 outputs. I'm trying to get it so that each output
can be turned on and off independentaly from each other but also that i could connect b and c together at the same time with LED's.
I did a search and found This but I'm struggling to figure out the two at once feature.
I would assume that it is 2 dpdt switches in the schematic and that I would need to add a third.
Also I should say that this is to switch between 3 amps not effects, dont know if that would make any difference.

Meanderthal · August 27, 2006, 09:44:59 PM

I know a guy who has one of these. It only outputs one send at a time. You can't turn all 3 sends on at once. A is just "on, off" and B&C work like an a/b box ONLY when A is off.
If you want the option of multiple outputs at once, you might want to use buffers to keep a good tone. A project I've been working on uses buffers to split the signal, I got the idea from the splitter blend project. Instead of the 2 buffers in that circuit you would need 3. Then use seperate switches for each send.
Just what I would do...

fixr1984 · August 27, 2006, 10:21:57 PM

Quote from: Meanderthal on August 27, 2006, 09:44:59 PM
I know a guy who has one of these. It only outputs one send at a time. You can't turn all 3 sends on at once. A is just "on, off" and B&C work like an a/b box ONLY when A is off.

I wouldnt want to turn all three on at once just to be able to have any one of the three on independently of the others but still have the option to have 2 at once.
I assume that you mean that A is on or off only. When A is off B and C can be either both on or one at a time. This Picture shows one switch as A or B, and the other switch is A and B. Does this mean you seclect output A or B with the first switch and the second will
select it as both A and B together? Basically what I want its to have Switch 1 to turn A on or off and switch 2 to select between B and C and the third
switch to change to both B and C. Is that possible?

Meanderthal · August 27, 2006, 10:35:42 PM

Sure! Just make that last diagram as the b half of an a/b and you'd an a/b/c/bc.

fixr1984 · August 27, 2006, 10:58:21 PM

Got it, thanks for the help on that. Another question, can I take the red wire from the second switch (labeled as " A and B LED") and connect it to the negative
side of both LED's to turn them both on rather than having a separate signal light? Obviously I would remove the LED and wire to B+.

fixr1984 · August 27, 2006, 11:40:55 PM

Nevermind, after looking at it I can see that it would work to turn both LED's on but when you would turn either A or B
on it would in turn light up the other one as well.

fixr1984 · August 28, 2006, 07:05:37 PM

I added another switch and changed the wires around by the "B" and "C" LED's. Will both LED's
light when B and C switch is turned on, and will they still be able to light independently off of the other switch?
I added the diodes going to the negative to keep them from grounding off each other. Does it look like i have it
wired right or did I miss something.

boogietube · August 28, 2006, 08:22:17 PM

Don't really know but I built this and it works perfect:
http://www.morleypedals.com/abces.pdf

fixr1984 · August 28, 2006, 08:34:42 PM

Quote from: boogietube on August 28, 2006, 08:22:17 PM
Don't really know but I built this and it works perfect:
http://www.morleypedals.com/abces.pdf

Can you turn two outputs on at once? Thats what im looking for?

boogietube · August 29, 2006, 04:08:16 PM

No, Sorry

News:

ABC box wiring?