It's gooped, and traced, don't tear yours up.

I'll post the schematic shortly, it's verified now.

Hey cool, that's pretty close to what I have as well. A couple values difference, but overall similar. Those dead-end components were pretty cool, can't say I've seen that before. :lol: BTW I didn't get a message (or email) from you, where did you send it? From the picture, the trace to R21 seems cu...

This one was a fun one.

Aside from the goop there were a couple dummy traces like the one in the pic below, as well as a handful of decoy components.

I'll post a schematic once it's verified. (It's definitely Zendrive-based, just FYI)

Lani wrote:Anyone know if this schematic has been verified. I have a bunch of old DBX 2150a that I would love to try in this circuit. I belive they are compatible. I'm looking into building a SSL too!!

I have some PCBs for it, but haven't had a chance to verify them yet.

I'm still unpacking after the move, once my computer is up and running I'll get the schematic for you. In the meantime... Input goes parallel into the overdrive and RMS detector circuits, output of overdrive into unity gain buffer then FET based gate (shunts signal to VREF when gated), through one l...

No need to trace it, I have a schematic for it.

The FETs in mine were marked 62P, which is still a J201.

If I get a chance I'll measure their specs with my DCA75, but not sure if I'll have the time to crack it back open.

Yep, there was a source bypass cap on the second and third JFET stages. The trimpots are also set up slightly differently. Yours uses 50K trims with a 10K fixed resistor, mine has 100K trims with no fixed resistor. Otherwise everything else is the same as your schematic. Your cap values are correct,...

Ahh yes, you are correct. It would have been C11 on your PCB.

atalas wrote:Eh I'm confused now. I'm pretty confident the treble control is hooked up the way it's shown in the schematic.

I can confirm, the Treble control is correct as drawn in your schematic.

You are missing a Source bypass cap on the third FET stage (it would be C5 looking at your pic of the PCB).

equinox wrote:We are assuming no other changes like caps thou!

Yep, of course. I'm just interested because of Manfreds simulations with the 10K pot in the existing circuit.

I have no doubt the traced values are correct for that revision of the circuit.

I made a frequency response compare of the Sizzle filter with both potentiometer values (10 kOhms and 100 kOhm). Thereby the value steps were 1 kOhm respectively 10 kOhms. The 10 kOhms potentiometer gives more significant changes than the 100kOhms potentiometer does. Very cool, much appreciated! :D...

R21 / R26 are 1K.. unfortunately no pic of the Sizzle pot value, but I'm fairly certain the schematic is correct for this revision.

Build docs uploaded now; https://www.pedalpcb.com/docs/PedalPCB-Muzzle.pdf Also OA3 needs + and - to be swapped. Just to clarify... the pin numbers were correct, the graphical symbol just needed to be updated. It's corrected now. The C7 / R7 / C8 junction really confuses the hell out of me... They ...

I noticed there are a couple FET in one of the gut shots for the G3. One is directly off the wiper of the volume pot and the other you can barely see under the gain pot. Maybe for muting? Those are SOT23 dual diodes packs. There is a BJT bypass mute circuit that wasn't included in the Tyrian or San...

Yeah man, docs will be posted soon... I'm way behind again.

Been swapping some computers around all week, should be starting to play catch up very soon.

Dsmnoisemaker wrote:OTOH, I just don´t like that much that pedalPCB is making money out of my design (a small fee would have been nice)

Hey bud, I'm not a monster (nor am I getting rich off of it), shoot me an email.

@bugg, is that in the actual JHS pedal? Yep. The reverb and "analog chorus" are both digital algorithms coming from the FV-1. In the original the boost is just an SHO style circuit tacked on the end... It's a tremendously noisy circuit. The clone has a lower noise floor than the original but it's n...

Feel free to post the schematic.

You might be surprised to find out how many pedals use the FV-1. Although it's far from a SHARC it's certainly capable of more than just cheap karaoke machines.