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Analog Chorus bypass works, led flashes, no sound

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bellyjeans55

Post subject: Analog Chorus bypass works, led flashes, no sound

Posted: Mon Apr 23, 2018 12:40 pm

Joined: Mon Apr 23, 2018 12:18 pm
Posts: 3

Bypass works fine; when pedal is engaged led flashes relative to the rate potentiometer but no sound passes through.

Update: resistor wire was touching side of trimpot. Pushing it slightly away fixed the problem.

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Last edited by bellyjeans55 on Tue Apr 24, 2018 2:52 pm, edited 1 time in total.

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byoc

Post subject: Re: Analog Chorus bypass works, led flashes, no sound

Posted: Mon Apr 23, 2018 6:02 pm

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Joined: Sun Jan 22, 2006 1:39 pm
Posts: 5991
Location: Richland, WA

Have you adjust the trimpot yet?

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jimilee

Post subject: Re: Analog Chorus bypass works, led flashes, no sound

Posted: Tue Apr 24, 2018 9:18 am

Joined: Sun Nov 18, 2012 5:13 pm
Posts: 4780
Location: Soddy Daisy,TN

Flashing led indicates a grounding issue most of the time. What are you powering it with. Also, check for solder bridges and you off board wiring.

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bellyjeans55

Post subject: Re: Analog Chorus bypass works, led flashes, no sound

Posted: Tue Apr 24, 2018 9:29 am

Joined: Mon Apr 23, 2018 12:18 pm
Posts: 3

Update: I've reflowed all the joints and the issue remains.

byoc wrote:

Have you adjust the trimpot yet?

I have, no difference in sound anywhere along its range.

jimilee wrote:

Flashing led indicates a grounding issue most of the time. What are you powering it with. Also, check for solder bridges and you off board wiring.

Maybe I was unclear, the led is pulsing the way it's supposed to, its rate is following the rate pot. Does that still indicate a grounding issue? I'm powering it via DC adapter. I also didn't see any solder bridges.

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byoc

Post subject: Re: Analog Chorus bypass works, led flashes, no sound

Posted: Tue Apr 24, 2018 11:35 am

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Joined: Sun Jan 22, 2006 1:39 pm
Posts: 5991
Location: Richland, WA

jimilee wrote:

Flashing led indicates a grounding issue most of the time. What are you powering it with. Also, check for solder bridges and you off board wiring.

No. The LED is supposed to blink on and off with the LFO rate.

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byoc

Post subject: Re: Analog Chorus bypass works, led flashes, no sound

Posted: Tue Apr 24, 2018 11:36 am

Site Admin

Joined: Sun Jan 22, 2006 1:39 pm
Posts: 5991
Location: Richland, WA

please post voltage readings.

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jimilee

Post subject: Re: Analog Chorus bypass works, led flashes, no sound

Posted: Tue Apr 24, 2018 12:07 pm

Joined: Sun Nov 18, 2012 5:13 pm
Posts: 4780
Location: Soddy Daisy,TN

byoc wrote:

jimilee wrote:

Flashing led indicates a grounding issue most of the time. What are you powering it with. Also, check for solder bridges and you off board wiring.

No. The LED is supposed to blink on and off with the LFO rate.

That’s crazy, I didn’t remember mine doing that.

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duhvoodooman

Post subject: Re: Analog Chorus bypass works, led flashes, no sound

Posted: Tue Apr 24, 2018 1:48 pm

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Joined: Tue Jan 02, 2007 1:24 pm
Posts: 16222
Location: Albany, NY

I'll leave the diagnosing to Keith (byoc) or Morgan, since they are w-a-a-a-y-y better with these BBD effects than I am. One suggestion I would make would be to shorten up your wiring substantially, and clean up the footswitch soldering at the same time. Shorter wiring greatly reduces the possibility of picking up an LFO "beat" sound in the output. Refer to the photo on page 4 of the Analog Chorus instructions as a good example to be shooting for.

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bellyjeans55

Post subject: Re: Analog Chorus bypass works, led flashes, no sound

Posted: Tue Apr 24, 2018 2:51 pm

Joined: Mon Apr 23, 2018 12:18 pm
Posts: 3

Solved without needing to take voltage readings! The wire on one of my resistors was touching the side of the trimpot. A little push away and everything works great.

And I definitely intend to redo the wiring. Seems silly that the instructions explicitly say to make the leads 3.5", but that's just a minor UX niggle.

Thanks for the help everyone!

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