Devi Workhorse/Cherry Pop tone control

McSpunckle · Post by **McSpunckle** » Mon Oct 25, 2010 12:03 am

Hey, kids. I'm trying to get a pedal working right, and I can't find any info. I basically need to know how the Cherry Pop/Workhorse tone control is wired. So! Anyone with one that wants to take a look... :cool:

Here's a schematic I did in paint (from Devi's SM schematic):

: VFMSM-schematic.gif (7.64 KiB) Viewed 2597 times

It's acting screwy, though. Oscillates way too easily, which you'd expect from a feedback path like that.

nbabmf · Post by **nbabmf** » Mon Oct 25, 2010 12:25 am

100k pot.

Lug 1: collector of Q2
Lug 2: 3.3M resistor
Lug 3: lug 3 of the volume pot, not the grounded one which should be lug 1

You might want to switch lugs 1 and 3 depending on how the "tone" control works.

McSpunckle · Post by **McSpunckle** » Mon Oct 25, 2010 2:13 am

And the other leg of the 3m3 is connected to the base of Q2, correct?

It seems I got it right...

So the search continues. :no:

Thanks for the info!

nbabmf · Post by **nbabmf** » Mon Oct 25, 2010 7:56 am

McSpunckle wrote:And the other leg of the 3m3 is connected to the base of Q2, correct?

Yep.

Everything is pretty much at max gain. If you want to bring it back under control, the first thing I would do is put a small resistor (less than 1k) from the emitter to ground on Q1 and Q2. Play with the values. Your basic gain formula is (collector resistor)/(emitter resistor). You have some feedback resistors and caps changing that as well, but those are important to the overall sound.

McSpunckle · Post by **McSpunckle** » Mon Oct 25, 2010 10:10 am

Oh, I posted that schematic to see if it was correct. I'm just trying to make a pedal work properly that had some loose wires, and that was the only part of the circuit I didn't know.

You're right, though. Some emitter resistors would be great for this circuit...

Teej212 · Post by **Teej212** » Mon Oct 25, 2010 3:56 pm

i thought the tone control for the CP was a BMP tone stack, no?

McSpunckle · Post by **McSpunckle** » Mon Oct 25, 2010 11:27 pm

There isn't one in this pedal. :idk:

nbabmf · Post by **nbabmf** » Thu Oct 04, 2012 2:22 am

Almost 2 years later... I have the pedal and am trying to fix it.

spacelordmother · Post by **spacelordmother** » Thu Oct 04, 2012 10:42 pm

nbabmf wrote:Almost 2 years later... I have the pedal and am trying to fix it.

If needed, I have both and can provide gut shots...

eatyourguitar · Post by **eatyourguitar** » Fri Oct 05, 2012 10:37 am

Devi does it again! hooking your output to +9v through only 110k :picard:

controlFreak · Post by **controlFreak** » Sun May 26, 2013 1:34 am

Yeah, maybe add a DC blocking cap to pin 3 of the "tone" pot before it connects to the volume, you don't want DC on the output!

Achtane · Post by **Achtane** » Sun May 26, 2013 1:43 am

Dr Satan · Post by **Dr Satan** » Sun May 26, 2013 10:23 am

controlFreak wrote:Yeah, maybe add a DC blocking cap to pin 3 of the "tone" pot before it connects to the volume, you don't want DC on the output!

I'd say put it between the collector junction and the "tone" pot. That way you keep DC off the pot too.

ilovefuzz.com

Devi Workhorse/Cherry Pop tone control

Devi Workhorse/Cherry Pop tone control

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Re: Devi Workhorse/Cherry Pop tone control

Re: Devi Workhorse/Cherry Pop tone control

Re: Devi Workhorse/Cherry Pop tone control

Re: Devi Workhorse/Cherry Pop tone control

Re: Devi Workhorse/Cherry Pop tone control

Re: Devi Workhorse/Cherry Pop tone control

Re: Devi Workhorse/Cherry Pop tone control

Re: Devi Workhorse/Cherry Pop tone control

Re: Devi Workhorse/Cherry Pop tone control

Re: Devi Workhorse/Cherry Pop tone control

Re: Devi Workhorse/Cherry Pop tone control