Hi all,

Newbie alarm, first post :)

I searched the web for some information but didn't find any build reports for the Vandal from Hell yet.

I ordered a kit of the Vandal from Hell kit from Musikding. The build document is here:

PCBGuitarMan posted a picture of the PCB here on FSB in '21:

In the above thread people wrote that they used their circuit with 12V or 18V power supplies, because the Randall circuit used 24V. But in the build doc of the Vandal from Hell it says 9V.

Also,...

Hi all!

i got this pedal in for some TLC as it produced a lot of noise. Turned out to be the CoolAudio V3207 IC. When replaced, all noise is gone!

I've made a schematic; some values of caps were not measurable

Maestro - Comet Chorus.JPG

The sound is really good! The Orbit Mode really rocks!

Check my blog for more pics and info. All links are in the sig

Hi guys, I'm repairing this amp but actually I cannot find a solution.

Clean channel and Power Amp works correctly.
Boost channel works but has a really low volume.

In attachments you will find the schematics.

I checked the tube section and everything is fine. Autotransformer works.

Voltages at tubes are:

1 - 181V
2 - 110V
3 - 110V
4 - 5,8V
5 - 5,7V
6 - 110V
7 - 0
8 - 0,675V
9 - 0

D3 Cathode - 266V

IC3 and IC5 are working because the switch is works correctly. I don't have replacement at...

Hi guys, I'm pretty much an electronics noob--but learning lots from all the stuff available. Now, I tried this mod (though a few might laugh to call it that)
I like the more natural boost sound, but everything else seems sharp and sterile.

I was wondering what you guys thought about this and the vox pathfinder 15 in general/mods

Hi! I've found an interesting tone filter in the shin-ei companion fuzz, but i don't seem to understand how it works and what it exactly does. Could someone help me?

Hi all,

My first try at tracing a circuit and third layout.
The circuit has an input + buffered output and an xlr ofc.
Versatile as it can be powered 9-16VDC or by phantom power.

The layout is verified , as I built it a few hours ago and works perfectly !

Peavey-EDB1-schematic.png

Row H can be ommited as it is not connected to any component.

Peavey-EDB1-layout.jpg

Cheers !

I just bought a used Way Huge Supa-Puss pedal with a broken Feedback controller. It looks like a 9mm D shaft potentiometer, but you push it into the shaft to cycle through the different beat zones. It's labeled 2F4. On the main PCB it's labeled RP5. Does anyone know what the specific part/value is?

Hi,

I recently purchased a vintage Shin-Ei FZ-1A fuzz pedal. It works however there is significant back ground static noise while the pedal is engaged. I basically have no experience repairing pedals however I do have a soldering iron and a meter and figured it maybe something simple. Any help would be greatly appreciated!! I am not sure how to post pictures but here is a link to one that is exactly like mine.

Hello.
I traced a DemonFX Omicron Darkglass that appears to be a copy of the Omicron Darkglass Alfa. I ordered a few PCBs with the schematic I traced, and it works just like the original (Demonfx). The only thing I have changed is the switching bypass, which I have made truebypass (the original used a CD4003 and JFETS). The rest, as is. Here is the schematic, in case you are interested.

okay.. I was struggling to figure out how to make this happen, but Seiche helped out with his suggestion to flip the image (for fitting the SMD) and Fender3D helped out with his pulse LED mod (not included in the layout below, but this link explains it) .. there's a spot on the PCB for that trigger ...so thanks to you both.
here's the pics..
outs incl an LED to show it's enabled, and the right one pulses with the rate.

and the guts.. you can't see it from here, but because I had to flip the...

Helloooooo,

I checked the connections twice and also double-checked the values. The numbering doesn't follow the PCB at all because the PCB numbering is buried under the components.

Here the voltages, all measured against circuit ground (not DC adaptor ground), pedal on, switches off, knobs at 12 o'clock

U1
1 4.73
2 4.73
3 4.67
4 0
5 3.88
6 3.90
7 3.90
8 7.77

U2
1 3.82
2 3.82
3 3.79
4 0
5 4.51
6 4.74
7 4.74
8 7.77

U3
1 3.88
2 3.88
3 3.87
4 0
5 3.81
6 3.83
7 3.83
8 7.78

Q1 J175 Pedal ON
D...

Intro

Hi everyone! I had the chance to get my hands on the MXR Doubleshot for a little while, and found out there are no available schematics anywhere. It's nice to do some selfless circuit tracing once in a while, in the true spirit of FSB.
Starting from what was known already, the Doubleshot is usually described as the dual channel version of the Dime, and we'll see this is accurate. That circuit already has something interesting in its own right, but this one builds upon it with the...

Hello, for everyone that loves Tone Bender MKII, here's some new stuff from Sola Sound that can maybe help avoiding the germanium instability, at least for a good measure.

I've drawn the layout (which is the same of the classic layout) according to the photos I've found here and there. It shows with some bias resistors changed and some corrections on the frequency cut for compensate the silicon brighness.

More info at

Q1 is a germanium AC127 (supposedly quite leaky), no info around Q2 and...

Hello guys! 😄
I found this pedal sitting around in my drawer, something I got a while back from a friend who told me it was some kind of overdrive.

The pedal came with one knob missing and no labels at all. I tried to figure out what the knobs do and wrote down some labels I applied, but honestly, I’m not sure if I got everything right since I’m kind of a noob with this stuff...

Could someone help me figure out if my guesses are correct? In particular, I’m really curious about what the two...

Hi folks!
Here is the TC Vintage Delay analog circuit schematic (a few parts are missed).

Cheers!

Good evening everyone, I know these are pretty basic questions, but since I'd like to start venturing into building some of these effects , I'd like to have the clearest ideas possible.
What I'm asking you is how these three different types of pedals should be used:

Preamp and amp emulation: should they be used like any other pedal or should they be put in the send-return? What should we expect in terms of sound? That is: if I put a Fender amp emulator on a Vox AC30 will it sound like a Fender...

I've been working on a WH-1 recently that didn't function yet seemed to have proper clocks and voltages. I don't have a schematic so I was doing what I could. I had another WH1 come in with separate issues, but the effect functioned after fixing. I took the opportunity to swap some ROMs to see if I could find the issue (I already previously swapped the big IC don't remember the label with no change). Swapping U22 brought the LED back, but no effect, then it seemed to freeze up. Also swapping...

Hi

I'm a new member and new to pedal building. Thanks for the forum!

I just completed a build based on the Small Bear Electronics Ursa Minor distortion circuit.

I completed the breadboard build and liked the sound of the two main options a) using a Darlington pair of transistors, and b) asymmetric diodes using an Si b2b with a Ge + Si. In fact, I liked it so much I decided to do a full pedal build.

Shipping costs to Australia made ordering the dedicated PCB and enclosure uneconomical,...

Hi Folks,

I'm new here and this is my first post. I recently built a PCB guitar mania Ghost Device and although the reverb effects and it's controls are all responding like they, the output signal is too loud and driving my amp to distortion.

I've done a search on the forum and found somebody was having the opposite problem. Their output signal was too low and they changed the value of R13(?) from 1m to 470r. If the output in my build it too high, should I just do the opposite, considering my...