True bypass not true bypassing

[timd]

I have had issues with true bypass in the past. I have made an APC/Mims Oscillator into a guitar pedal and an AM/FM radio into a guitar pedal - both with true bypass. The issue with both is that I can hear the signal (though with a lower volume) with bypassed. I thought true bypass was an all or nothing deal. Any thoughts?

[kodiakklub]

what schematic are you using for the TB?

[kodiakklub]

grounded input true bypass. as simple as it can get.

[timd]

This one:



http://www.sabrotone.com/wp-content/uploads/2011/01/TrueBypassWiring.jpg

[Jdansti]

This one:



http://www.sabrotone.com/wp-content/uploads/2011/01/TrueBypassWiring.jpg

It looks to me like the drawing is using the enclosure to provide a ground path between the input and output jacks. You might want to try a jumper between the two ground lugs on the jacks. If the bleed-through goes away, you probably don't have one or both jacks well grounded to the enclosure.

[timd]

Does the fact that these circuits are a source of sound themselves also matter in some way?

[timd]

This one:



http://www.sabrotone.com/wp-content/uploads/2011/01/TrueBypassWiring.jpg

It looks to me like the drawing is using the enclosure to provide a ground path between the input and output jacks. You might want to try a jumper between the two ground lugs on the jacks. If the bleed-through goes away, you probably don't have one or both jacks well grounded to the enclosure.

I will try this and report back!

[timd]

Jdansti - You rock because your help fixed the issue and made my day! You're right - the bypass I linked was counting on the case to connect the inputs. Because of the size of the radio circuit I was working with, I bought a plastic case. Last time I checked, plastic doesn't really conduct...Thanks again!

[Jdansti]

Glad you got it going!  It always helps to have another set of eyes look at something. I'd be lost at work without other people reviewing my work!

[petey twofinger]

what schematic are you using for the TB?

grounded input true bypass. as simple as it can get.

forgot to switch accounts did we ?

oopsies !