Is there a cure for the Echobase's delay bleed in bypass?

[Nitefly182]

I finished an Echobase recently and its really great sounding. Im having an issue with the delay signal bleeding in bypass, however. With the tails on it bleeds all the time. With the tails off it bleeds whenever I have my amp switched on to the gain channel with the delay going into the input. Has anyone else noticed this problem? Is there a known fix or is it a quirk of the bypass scheme?

[edd29]

I finished an Echobase recently and its really great sounding. Im having an issue with the delay signal bleeding in bypass, however. With the tails on it bleeds all the time. With the tails off it bleeds whenever I have my amp switched on to the gain channel with the delay going into the input. Has anyone else noticed this problem? Is there a known fix or is it a quirk of the bypass scheme?

there's no problem with echo base if done a correct value parts or no short circuits
just double check your pcb compare it to schematic  that's my only advice my friend.

[Paul Marossy]

Did you wire it grounded circuit input true bypass? If not, that might fix your problem.

EDIT: Of course, the above doesn't apply if it's an electronic switching scheme. I haven't looked at the Echo Base schematic for a while...

[Nitefly182]

Im using the electronic switching scheme although Im considering true bypassing it to ditch the bleed.

[Taylor]

Seems likely that the signal's bleeding from, e.g., the feedback pot, into the input or something similar. I've built 2 EBs and neither has this problem, so I think it's your build. If you're positive nothing's wrong with the board, I'd take a look at where wires are passing that might be bleeding, and try using shielded wire for the input and output.

[slacker]

Like Taylor said there shouldn't be any bleed through, mine has none anyway. I think a couple of people have mentioned a small amount on their builds, but I'm not aware that it's a major issue.
The only time I get any bleed through when bypassed is if  I have it in "Boss" mode with the feedback cranked right up, even then I have to turn the amp up stupidly loud to be able to hear it, at normal levels the hum from my guitar is louder than any bleed through.
If you're getting it in "tails" mode it means some signal must be getting to the PT2399, either through the first CD4066 switch or via solder bridge or something. I'd try changing the CD4066 first just in case there's a problem there, also check the voltages on the CD4066 to make sure the switching is working properly.

[Auke Haarsma]

just popping in to say I have also bleedthrough in bypass. I'll check if swapping the 4066 could solve this.

I have used my own 'designed' pcb btw. with added tempo-led.

[slacker]

How bad is the bleed through?

[Auke Haarsma]

noticeable. Especially when driving the EB with a gainy pedal. It is louder than any hum etc. At band-levels it can be cleary heard.

[Nitefly182]

I just true bypassed mine although moving about 6 wires is probably something I should go in and do.

[John Lyons]

It may be a wire routing issue.
If you have the in/out wire bundled up
parallel together they will bleed
into each other. Shielding will help
but physical placement is the cause.

Just an idea.

John

[Nitefly182]

It may be a wire routing issue.
If you have the in/out wire bundled up
parallel together they will bleed
into each other. Shielding will help
but physical placement is the cause.

Just an idea.

John

The in and out wires were both shielded and as far apart as possible. The delay time and feedback pot wires ran parallel to the modulation wires for about 1.5" which may be causing a tiny bit of extra noise.