Was anybody successful building a JJ Rocket Boing clone using pedalPCB sproing PCB? I reflowed all my solders, checked for bridges, switched my IC for different kind of opamps without success.
The output gain is way below unity. When plugging a guitar, I get no signal at all (or so low that I can't amplify enough to distinguish it from the static noise).
With an audio probe, I notice that the signal out of the first opamp (pins 1-2 or IC2.1) in the schematic at https://docs.pedalpcb.com/project/Sproing-PedalPCB.pdf is already way below unity. Would a resistor in the feedback loop between these two pins help (not that I know how I would handle this on the PCB...)?
Does anybody have any other idea? I'm kind of bummed. First pedal using a PCB after building 10 or so from vero or tagboard without too much trouble...
PedalPCB sproing [SOLVED]
-
grrrunge
- Diode Debunker
Information
Sounds odd. Could you measure the voltages on all 8 pins of IC2 and list them here.
A true believer in the magic of Sherwood Forest Pedal Pirates
---
New base of operations: http://www.knucklehead.dk
---
New base of operations: http://www.knucklehead.dk
-
cspar
- Breadboard Brother
Have you double checked that your 3pdt is orientatied correctly?
"There is discussion, brainstorming, disagreement, testing, verified layout and schematic. We are the fucking stompbox university -- only for those who still read though..." - Modman
Not the issue but thanks for steering me in the right direction. It was a bad switch. I am so used to testing circuits before boxing them and wiring jacks and switches that it did not come to my mind.
In retrospect, once I had checked all voltages, it should have been the next thing to check.
Lesson learned!