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Super Contributor
hcprimerib
Posts: 2,666
Registered: ‎09-08-2005

built A/B switch, has bleed through on off channel

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‎01-30-2013 04:05 PM

So I built one of these AB switches, but when I have it on the output , the other has a little bleed through.

 

I use it to go to an amp, and a tuner.  I don't want the tuner in the circuit, hence the AB idea.  But when it's on the tuner out, I can hear a little guitar through the amp.  Any ideas why?

http://www.beavisaudio.com/projects/Looper-Switcher/A-B-Switch-No-LED.png

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Quote Originally Posted by SweepLegatto View Post
The noise comes from the cabinet, not from the pots of the front panel.
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Super Contributor
rushtallica
Posts: 28,246
Registered: ‎02-10-2004

Re: built A/B switch, has bleed through on off channel

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‎01-30-2013 04:30 PM

I'm not sure why there's some bleed through, but if you make it true bypass with a 3PDT, I think that'd probably fix it.
http://www.diystompboxes.com/smfforum/index.php?topic=25052.0

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Super Contributor
hcprimerib
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Re: built A/B switch, has bleed through on off channel

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‎01-30-2013 04:55 PM

actually, this is supposed to be true bypass

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Quote Originally Posted by SweepLegatto View Post
The noise comes from the cabinet, not from the pots of the front panel.
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Regular Contributor
HKSblade2
Posts: 190
Registered: ‎01-17-2013

Re: built A/B switch, has bleed through on off channel

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‎01-30-2013 10:10 PM

Leakage via the switch, noisy wiring? Did you use shielded cable? I had a cheapo Carvin amp switch and it was noisy. I went with shielded cable to eliminate most of the bleed. Didn't get it all though. Eventually bought a Radial unit. Solved the problem.

Most good switchng units have buffered I/O. Try shielded cable.

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Super Contributor
hcprimerib
Posts: 2,666
Registered: ‎09-08-2005

Re: built A/B switch, has bleed through on off channel

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‎01-31-2013 05:59 AM

Bah, it was a flaw in the diagram design.  I went with the simpler "eric johnson" wiring and it's noiseless:

 

http://i269.photobucket.com/albums/jj50/walterw2/abschematic.gif

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Quote Originally Posted by SweepLegatto View Post
The noise comes from the cabinet, not from the pots of the front panel.
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Super Contributor
rushtallica
Posts: 28,246
Registered: ‎02-10-2004

Re: built A/B switch, has bleed through on off channel

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‎01-31-2013 04:09 PM

I'm glad you got that sorted and may have to try getting one together someday, too. 8)
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Quote Originally Posted by isvoid View Post
triumphs, be them big or small, it all distills down to that
~Confucious say, Man who stands on toilet is high on pot~
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