I have an old Type P210 tc scf. The gain pot went open and I had to tear it apart to clean and lube the pot. All that done, I did some scoping and measuring and found that it's putting a DC offset at the outputs. The offset starts at 7V (roughly half of 15V) and decreases very slowly. I replaced the most obvious cap and that didn't help. Even when unplugged with a shorted input, it takes about an hour to get back to 0.0V.

The schematics are difficult to read, however, it appears that the...

Hello everyone,
I started advanced projects since I crafted tons of simple and intermedium pedals and amps.

This is a really challenge since there are a lot of components.

Here the schematic:
20240804_173822.png

Here my DIYLC layout:
20241007_172204.png

Here the bottom DIYLC of the board already flipped & real pcb bottom
ZomboDroid_07102024052718.jpg

Here a comprehensive photo of the setup:
20241007_171419.jpg

It doesn't work properly.
The diagnosis:
- original signal pass...

Hi all!

I got a reissue OD-850 in from Ibanez.
Traced the pedal and put it next to my vintage unit. They are quite similar.

OD850 RI.JPG

I added a lot of pics between my vintage one and the reissue on my blog; check the link in the sig

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 didn't see another thread about this one, so posting it here.
I picked up a new 2024 MXR YJM308 Overdrive yesterday and in the process of reverse-engineering it.
Many people speculated would just be based on the Fender unit or DOD YJM308, but this appears to be unique with through hole parts on top and SMD on the bottom!!

Still working on the BOM and need to confirm the SMD components, but here is a DRAFT BOM.
How does it sound....good. The original DOD308 I liked, but has a lot of bottom....

I don't think I've seen this one anywhere so I traced mine. This is my first trace so I breadboarded it to make sure it checked out.

A few things I noticed.
- Obviously Oliver left some open lugs on the pots. I drew it as is instead of fixing it.
- I didn't draw out the TRS jacks but all four are TRS.
- The Gain pot didnt have any markings and measured at 870k. I'm assuming it's a 1M and it is definitely a C taper. Probably just a part tolerance thing.
-C101 is 4u7. I've never seen a...

Germanium or silicon guns?

I was eyeing one for some time. The sound is like a muff but with more mids and a great selector switch.

EnjoY!

Biyang - FZ-7.JPG

More pics can be found on my blog; check the link in the sig

Hello everyone, this is my first post here and I am looking for some help. Please keep in mind that I am a novice with electronic repair and reading schematics but I am learning. So I’m starting my journey into pedals with a phase 100 script circa 1975. It came in the mail a few days ago and while it mostly works it does have a couple problems.

It is a little bit of a noisy pedal but that might go away after it warms up a bit or if I change its location in my chain, I’m not sure about that....

Hi guys.
Any idea where to find a schematic for a NUX HG5 pedal?
Thanks in advance.

Hi all!

I searched for it but no dedicated post was made on this effect pedal. There is one on the 'Probe series' but all probe pedals are discussed there.

I got one in for some TLC and to add a LED. The owner makes a lot of nice noise music but in the wash of his playing he couldn't hear if the pedal was on or off. I added an LED to the pedal (and a DC jack / he just cut a hole in the side to get a wire in)

You can find pics and a schematic in my blog; check the link in my sig.

I traced...

Reprinted in Guitar Player magazine circa 1971, from Electronics World Magazine January 1971. MultiTone.pdf
MultiTone1.png
MultiTone2.png

Hello everyone
I built a tonebender mkii, after some transistor choices I have the following parameter.
the sound is not bad, but there is doubt about the lack of leakage in Q1. Is the resistor sufficient?
trimpot Q2 and Q3

9.88v
HFE/Lk (DC55) C B E
Q1 AC128 - 65/0.036mA 8,00
Q2 NKT72u - 76/0.063mA 0.47 0.11
Q3 2N1309 -242/0.403mA 8.04 0.46 0.38

I put a 2m2 resistor Q1 collector base

I've never had a mkii in my hands, so I don't know if it's looking good.
Any tips?
thanks

I had one of these for a while, serial # 011 from 2009, and decided to trace it. I got far enough to realize it was looking a lot like a Big Muff, so I spot-checked the rest, and indeed it is. Starting from a stock Triangle BMP schematic, you can make these changes to get a Yeti:
Q1 - Q4 = BC239C
Add the AMZ Presence (mids) mod, except it's a 4-position switch instead of a pot, with the 4th position bypassing the Tone pot
Sustain pot is A100k instead of B100k
DC filter cap is 220uF...

I made some inroads towards tracing the PS-001 Distortion.

Turns out it is more than an MXR Distortion+ with a Muff tone control. Structurally it's more like a Boss DS-1.
(Given the similarity of the Guyatone PS-005 Overdrive to the Boss OD-1 it's not surprising there is some similarity to the Boss DS-1.)

Unfortunately there's some ambiguity regarding the tone control caps. (The two polyester caps on the middle-edge of the PCB where the wires are).

Enclosure:
guyatone PS-001 distortion -...

Guyatone made a large number of pedals by there's surprisingly few schematics.

I started off looking at the Guyatone PS-001 Distortion but there's not a lot of PCB pics out there.

In the process I found some info on the sister pedal Guyatone PS-005 Overdrive. At times people have tried to guess what this one is as well

I managed to trace the structure of the circuit. It looks like a Boss OD-1 (ish) circuit with a Muff Tone control. Unfortunately no values.
guyatone PS-005 overdrive -...

I got this fuzz as I wanted to try another Germanium Fuzz Face sound.

It is a great fuzz face like pedal with germanium NPN transistors (MP38A)

I traced the pedal:
ZCAT - Cat fuzz.jpg

More info and pics on my blog; in my sig is the link

Hi. After all, sorry for my English.

Is anybody interested in tracing the Aguilar Octomizer?
I have one a long time ago, and tried to trace it myself, but don't have the time and knowledge to do it.
I degooped the little secret part of the PCB, but I'm afraid I scratched too much and deleted the marking on an IC. And there is a smd diode broken too, that I think it's a dual smd diode, kind of 1n4148.
I can messure any resistor or capacitor, or desolder too.
Here it's a shared folder with...

Built RG Keen's Lera from Geofex to add to a PedalPCB clone of the Walrus Julia.

The On/Off switch works and the Lera does affect the sound of the Julia by adding a warble. The speed is quite fast. Neither the ramp up/down switch, the instant/delayed switch, nor any of the three trimpots have any effect on the sound.

I added the optional 10uF capacitor to the output of the 78L05 but no difference to the sound.

The build doc says Once you get it wired up, check it out with a...

Hi. Does anyone have quilter phantom block circuit?

Germanium Fuzz Machine

The designed effect is modeled on the classic Fuzz Face. I used SFT322 germanium transistors (NOS). They have lower gain than AC128/2N404, which gives us a much lower level of distortion. Perfect for rock 'n' roll songs.

The Fuzz has a 125B style housing, crocodile skin paint coating, anodized aluminum faceplate, and laser engraved inscriptions.

Instead of the standard linear FUZZ adjustment potentiometer, I used the Rev-Log potentiometer. We can adjust the gain more...

I have a 1980 long dash Boss OD-1 with the 4558. But I have a few issues with the pedal...I think. For one, the pedal doesn't work on a battery, yet the jack doesn't seem to be shunted. The LED never illuminates, even momentarily, yet the LED is tested and working fine. Also, the pedal just doesn't sound right to me. I've never played an OD-1 before, but it seems very dark and muddy with humbuckers. The 2nd half of the overdrive knob seems to not affect the sound at all, at least to what I'm...

I bought a used Way Huge Supa-Puss pedal with a broken Feedback control. It looks like a 9mm D-shaft potentiometer, but you push on the shaft to cycle through the different beat subdivisions. It is labeled 2F4. On the main PCB, it is labeled RP5.

Someone mentioned to me that it could be an encoder, but I have no idea. Does anyone know what the specific part/value is?

Hello everyone.

I've traced the 'Mountain Range' side of the Fuck Mountain by SS/BS. According to marketing this is the SS/BS Mountain Range circuit. The Mini/Fuck side is already out there.

It's an interesting if not rather simple circuit. I'd have done things differently for sure. That output cap could cause switch popping. You could replace it with a 100n and the new cut off frequency would not be a perceptible change.

I have not dismantled the unit as it isn't mine. Due to this; all pot...

Traced schematic and photos

EHX_RamsHeadReissue_Schem_GBisson.png

RamsHead_01.jpg

RamsHead_02.jpg