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 !

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

Guys, help me,
I got this pedal dismounted who knows why, i did that long ago.
I remember to like this effect, so i want it to try it one more time.
The pcb board is ok but there is no 3dpt switch connected to the main board, i now have this six pins which i have no idea how to connect. I just want it to hear it again and if i likex it, i will buy a new 3dpt switch and install it.
IMG_0953.jpeg
As you can see i have already tried to make it work and understand how the six pins are connected...

A lot of people really like the old Rockman modules. They have been out of production for a long time now yet there are no schematics available. I understand the US patents expire after 20 years so they would not now be covered (?). Looking at pictures of the stereo chorus pcbs, it looks like it would be possible to clone it and I would love to have a go but without an accurate schematic it would be a world of pain. Has anybody else tried this?

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,

I have got a 720 EHX Looper, which makes a whining square wave tone above 10khz when used in half speed playback mode.

Any Idea what it might be? Or how to troubleshoot it.

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...

Traced from a 2004 unit.

Clearly based on a tube screamer with some interesting addtions/changes. With my set up the Phat switch doesn't do much.

There is no pull down resistors. The Bias rail isn't at half the supply. The last half of the 2nd op-amp is not used.

I can't add the schematic so here is a link to my reddit post with it attached.

This is the most recent refinement of a generic boost/buffer circuit I've been using for a while. It's a soft clipping boost with a subtle crunch, like a perfectly toasted bagel. Bypass scheme inspired by Valve Wizard , diodes-to-ground soft clipping inspired by Thunderbird (and discussed in this thread ).

I used a 10k linear pot but a different taper (log or audio I suppose) would let you omit R6.
My schematic says opamp_quad but feel free to ignore that and use a TL071 or similar.
D5/D6...

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...

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.

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...

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...