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 !

Hi,

I bought a broken RV-5 because I thought I could repair it. First thing I noticed is that somebody tried to replace the D1 with another non SMD diode, but I quickly replaced it with the original part. By then, I had noticed the IC6 S8520E33 was hot, so I did the 3v3 stabilization mods, except that I used a LD1117V33 with a TO 220 package (I checked and it seems to be the same as the other one; I couldn't find the SOT 223 package anywhere where I live). I soldered the 1117 with little wires...

Hi All, I got an old Boss BE5 multi-effects cheap from Ebay. It mostly works OK but the compressor wasn't working at all. I took it apart and found that someone had changed out the 1 microfarad electrolytic coupling caps for polyester ones but they clipped the leads of the old caps on the component side and tried to solder the new caps on to the tiny bits of the old legs sticking up. This was a bit of a mess and some of the solder joints had broken. Anyway I cleaned up the solder pads, removed...

Hi to all.
Fuzzface has undergone so many modifications, so only mine is missing :D
I set out to redo the fuzzface in a way that would be easy to repeat and not sound as sharp as the silicon transistors. Therefore, I decided to add zener diodes between the base and the collector and it softened the sound. Also, the capacitor at the input is also of reduced capacity so that there is no excess of low frequencies.
Here is the modification scheme:

And here is the video:

Criticism and...

Ok, I might intentionally have double posted this :D. I do apologise, but I think this might be of interest to more people.

I have some Qtron (+) mod questions:

1. Volume mod. I presume it would be done by adding a A10k in a standard way like this?

2. R32 mod. Is it the R32 as in the schematic of this thread ? And with what should it be replaced? I think it is already altered in this version as I read it was replacing the 100k with a 47k or lower. Am I correct?
3. Mix mod. Am I correct in...

Hello, Is there anyone who has the Keeley Compressor Pro and can send me high-quality and high-resolution photos of its PCB ? I want to design a compressor with THAT4320 and I want to get help from this pedal. :D

Hi all!

I have been doing some research upon this issue.

I recently got an old V2 EHX Small stone in that didn't work. In the end I traced the problem to a non functioning EH1048 IC in the LFO section. I replaced that IC with a socket.
- With a spare EH1048 I got from another pedal I get a fine working EHX Small Stone
- With a CA3094 I don't get any working sounds

In all the schematics and information online I can find that everybody mentions that the EH1048 is a rebranded CA3094.

Guess...

I got this unit in as it wasn't functioning correctly. I tried part of the problem to a wrong oriented filter cap. When I measured most electrolyte caps I noticed that they didn't measure properly. In the end I replaced all electrolyte caps.

Belcat - Power Master.JPG

Notice that all voltages (after the fix) are of different values. Guess a low quality pedal!

Check my blog for some pics

Hi friends,

Do you know the exact value of these elements?

R25

R24

C16

Does anyone have a schematic for the Danelectro Rocky Road. I'm working on a rehouse and I'm having trouble with the speed potentiometer. I'd like to see if I have the correct value and if have it wired correctly.

The original pot is marked 104 which I interpreted as B100k.

Hey there,
Ive just recently got a Crybaby gc95 wah. Ive noticed that, when the wah is almost fully pressed toe down (trebly end) , just before clicking the footswitch and turning effect OFF - theres a space there that causes silence - no bypass tone or wah tone. I can sometimes hear it when rocking the pedal and getting too close to the trebly end or when turning off the pedal - theres a little brief cutting of the sound. A couple of time it actually was stuck there even after continuous...

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...

Hey everyone,

I wasn't sure if I should have posted in the old Hudson sidecar thread .

In 2024 Hudson Electronics introduced the Motorcycle as a limited edition:
The Motorcycle is a modified version of our Sidecar overdrive pedal – our take on the soft clipping overdrive circuit with the added versatility of a powerful two band EQ which draws inspiration from a vintage recording console.

I have built many pedals, but I have never drawn a schematic before. I did my best to identify all the...

Does anyone know where to get a replacement DC jack for this pedal? It is not the typical DC jack, there is an additional switching element - it has 5 pins on it. The only source I found so far is

and that's a little expensive for a dc jack and not too available.

Any info appreciated

Thanks

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,

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