Rockman Ultimatum Distortion Generator Pedal [Traced]
Considering only about 50 of the Rockman Ultimatum Distortion Generator pedals were ever released, and having gotten my hands on one for a time, I thought it wise to trace and verify the circuit. I spent a good amount of time, coincidentally with Robert (@PedalPCB) doing a trace of the same pedal at the same time, I took the time to breadboard the circuit based on the trace I made - but without the "low-battery" and "buffered-bypass" sections.
http://endprod.com/filez/Ultimatum_Prot ... one_01.jpg
The complete set of notes, layouts and schematic is here: http://endprod.com/filez/Ultimatum_Trac ... matics.pdf
Robert (@pedalPCB) completed his trace and has already produced his version as a PCB project (Proposition Distortion) of this rare pedal here: https://www.pedalpcb.com/product/pcb504/
Enjoy!
http://endprod.com/filez/Ultimatum_Prot ... one_01.jpg
The complete set of notes, layouts and schematic is here: http://endprod.com/filez/Ultimatum_Trac ... matics.pdf
Robert (@pedalPCB) completed his trace and has already produced his version as a PCB project (Proposition Distortion) of this rare pedal here: https://www.pedalpcb.com/product/pcb504/
Enjoy!
Thanks!
I fail to understand how the output volume pot works the way it's drawn. It would have very little influence on the output volume at any setting. Are you sure the outpot jack doesn't come off the bottom of the volume pot? (pin 1). Then it would make sense.
I fail to understand how the output volume pot works the way it's drawn. It would have very little influence on the output volume at any setting. Are you sure the outpot jack doesn't come off the bottom of the volume pot? (pin 1). Then it would make sense.
It works perfectly. It may not be drawn "conventionally", but it works just fine. Note the lug numbering in relation to the pot rotation. It's the same as if the pot (in the schematic) were vertically flipped and the lug numbers swapped. I'm confident that you can visualize it.
- FiveseveN
- Cap Cooler
Information
Well, it works as it is and same as when so wired on the breadboard. What else can I say?
Sure, the connection from lugs #1 & #2 can separated and the output taken directly from lug #2 instead of the joined #1 & #2 lugs. But to say this doesn't or can't work is just silly.
- phatt
- Transistor Tuner
I see it drawn as a Variable Resistor and as such it would effect the output volume, at least down to the value of R22
If If pin 1 was grounded (bypassing R22) then at zero the output would be nil, a dead short across the signal path = no sound.
I've seen this Variable Resistor idea used as Volume control in a few amp circuits, not common but it does work.
Phil.
If If pin 1 was grounded (bypassing R22) then at zero the output would be nil, a dead short across the signal path = no sound.
I've seen this Variable Resistor idea used as Volume control in a few amp circuits, not common but it does work.
Phil.
Phil - precisely. The 8K2 value of R2 simply prevents the signal from ever going directly to ground. So there will always be some signal going out.phatt wrote: ↑01 Oct 2022, 00:25 I see it drawn as a Variable Resistor and as such it would effect the output volume, at least down to the value of R22
If If pin 1 was grounded (bypassing R22) then at zero the output would be nil, a dead short across the signal path = no sound.
I've seen this Variable Resistor idea used as Volume control in a few amp circuits, not common but it does work.
Phil.
- soulsonic
- Old Solderhand
Information
It forms a voltage divider with R23. It's not typical with C4 being between R23 and VR1, but that's how it works.
"Analog electronics in music is dead. Analog effects pedal design is a dead art." - Fran
Inevitably, I ended up redrawing the whole thing to help me gain a better understanding of its workings. I'm leaving the drawing here in case it helps someone. Note that this is as-built by SR&D. For the sake of 'science", I didn't delete anything from the original (not even the active bypass or low battery indicator). Credit goes to Cybercow, and Robert at PedalPCB. I compared notes with their drawings.
I checked it thoroughly, but please let me know if you spot any errors.
-Jerry
I checked it thoroughly, but please let me know if you spot any errors.
-Jerry