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Devi Workhorse/Cherry Pop tone control
Posted: Mon Oct 25, 2010 12:03 am
by McSpunckle
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...
Here's a schematic I did in paint (from Devi's SM schematic):
- VFMSM-schematic.gif (7.64 KiB) Viewed 2599 times
It's acting screwy, though. Oscillates way too easily, which you'd expect from a feedback path like that.
Re: Devi Workhorse/Cherry Pop tone control
Posted: Mon Oct 25, 2010 12:25 am
by nbabmf
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.
Re: Devi Workhorse/Cherry Pop tone control
Posted: Mon Oct 25, 2010 2:13 am
by McSpunckle
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.
Thanks for the info!
Re: Devi Workhorse/Cherry Pop tone control
Posted: Mon Oct 25, 2010 7:56 am
by nbabmf
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.
Re: Devi Workhorse/Cherry Pop tone control
Posted: Mon Oct 25, 2010 10:10 am
by McSpunckle
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...
Re: Devi Workhorse/Cherry Pop tone control
Posted: Mon Oct 25, 2010 3:56 pm
by Teej212
i thought the tone control for the CP was a BMP tone stack, no?
Re: Devi Workhorse/Cherry Pop tone control
Posted: Mon Oct 25, 2010 11:27 pm
by McSpunckle
There isn't one in this pedal.
Re: Devi Workhorse/Cherry Pop tone control
Posted: Thu Oct 04, 2012 2:22 am
by nbabmf
Almost 2 years later... I have the pedal and am trying to fix it.
Re: Devi Workhorse/Cherry Pop tone control
Posted: Thu Oct 04, 2012 10:42 pm
by spacelordmother
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...
Re: Devi Workhorse/Cherry Pop tone control
Posted: Fri Oct 05, 2012 10:37 am
by eatyourguitar
Devi does it again! hooking your output to +9v through only 110k
Re: Devi Workhorse/Cherry Pop tone control
Posted: Sun May 26, 2013 1:34 am
by controlFreak
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!
Re: Devi Workhorse/Cherry Pop tone control
Posted: Sun May 26, 2013 1:43 am
by Achtane
lel
Re: Devi Workhorse/Cherry Pop tone control
Posted: Sun May 26, 2013 10:23 am
by Dr Satan
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.