Hello,

I've had a Walrus Audio Canvas Mono in my possession for a few days, so of course I've taken it apart to see what's inside... ( in conclusion, it's very expensive for very little ).

I'll have a look at the schematic (relatively simple at first glance)

on the other hand, I'm looking for a way to measure the two transformers without destroying or unsoldering them.

For now, I'm going to measure their resistances, I'll try to measure the impedance, and I'll inject an AC voltage on one...

Hello everyone, everything good?
I put together this version of Fender Blender....

Firstly there were 5 bc239c transistors with hfe around 600, it was very noisy.

I changed the first two transistors with 2n3904 with hfe=360, now it sounds decent.

However, the boost tone has volume problems, I checked the R34 and R35 but I couldn't find this diagram, which resistors did the reissue change to fix this volume problem in the boost tone?

grateful
André

Hey there!

It's Jordi, I'm the developer of ImageToPCB, not sure if any of you are familiar with the software. Summarizing it allows to convert images to gerber and drill files ready to send to a PCB manufacturer.

Recently a user made a video showing how she combines DIY Layout Creator and ImageToPCB so I thought about posting here as it might be of interest for the community.

This is my first attempt at PCB design. I chose a simple circuit and followed along to DigiKey's KiCad tutorials. . The One Chip Pony only does one trick—and it only uses one chip!

Clown color hydro-dip finish felt appropriate.

Maybe it looks a little silly in such a large enclosure, but I needed the extra room for the giant knob! This layout was designed specifically to accommodate the knob and switch, and also to be easy to troubleshoot.

An input gain stage feeds a comparator....

one 12 speaker and two 8 speakers mounted in the sides...

ga83s.jpg

ga83s.pdf

Found these pictures on a Reverb listing:

GA83S 00.webp GA83S 01.webp GA83S 02.webp GA83S 03.webp GA83S 04.webp

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

Cheers!

Hi guys, i really appreciate some help here.
I have an EHX Freeze with PCB Rev B.
The Pedal was working intermittently, and after i disassembled it i noticed two major problems:
- Broken Toggle Switch;
- Footswitch with signals/marks that has been opened before.

After some research i ordered the exact same parts:
- Toggle Switch: 2MD3T1B1M2QES (on-Off-on)
- Momentary Footswitch SPDT On-Momentary On 3 Pin PCB Mount.

I carefully dessolder the old ones, and mounted the brand new parts, and like...

One of this rock opera's orchestra guitarists posted this somewhere more than 20 years ago. I forgot I had it until the topic came up on another forum. Thought I'd post it here for the record (which is the meaning of the file names: Side 1, Side 2, etc. refer to the 2-disc LP set.)

Came across one of these used in NL, for big bucks, so I was intrigued (sceptic) to see what makes it tick.
Apparently they are not made anymore. TEFI has a gut shot on their website, but I found one for sale with legible markings on two IC's.
BBD based (like the Fairfield Circuitry shallow water).
GE_04-2-R.jpg
Inside
GE_09-R.jpg
The BBD
bz5jzfydruiftcpaxdh1.webp

simple clock, it seems, rather than the random one in the Fairfield circuitry, and some old transistor, I have some 2N3565...

hagstrom_210-bass_sch.pdf_1.png
hagstrom-bass-210-1108918.jpeg

using an ECLL800 triode + double pentode

Roger Mayer Voodoo 1, Version 2 (Big Box)

Hey guys,

Having some problems with my RM V1, ver 2 (big box), is anyone able to share some gut shot photos of their RM V1?

It would be great for me to be able to refer to, as I think my pedal has been modded/messed with in the past.

Thanks.

Hello all. I'm new to the forum so I hope I'm doing this right.

I recently acquired an original Dunlop 535 Non Q Crybaby but it looks like someone has tampered with the mini PCB for the Rotary Switch. There are several capacitors and resistors missing and I'm not entirely sure the capacitors that are there are the stock values either. I would like to get it back to stock if possible but I'm having trouble finding a schematic that I trust. The only Non Q schematic I could find was from an...

Forget it I figured it out

Hi all! I have this dead effect after bad repair... I made schematic of it but I not checked it. So It can has mistakes. And It can has sligth difference in some capacitors values greater than 2u2. So check it please if you will make it and dimentions too.
In PCB I saved original topology (check ZIP file).

Just got a Fender 75 amp. I've spent two whole working days restoring it to factory specs. To make future easier for someone, here are layouts - of a Riviera-Era footswitch (which works for all Riviera-era amps, see and of a Hi/Lo and Standby switches in a 75.

Fender Riviera Era Footswitch.jpg

Fender 75 HiLo and StandBy Switch.jpg

I recently got this vintage pedal PUE Sustain Filter (Poles are really creative at naming stuff), and it was described as Polish Big Muff, so I decided to check out the circuit. PUE was producing guitar pedals in the 80s in Lodz, Poland.

PXL_20240303_202929008.jpg

It has a plastic enclosure with battery only a power supply (however, the DC jack was added by a previous owner), and the PCB has a metal screen attachment, which is supposed to keep out radio interference. PCB is single-sided,...

Hey FSB,

This is my first post here. I wanted to share the schematic for the Lone Wolf Audio Left Hand Wrath that I recently traced. Big surprise it was nothing remotely original, as it was an almost direct copy of the Dunwich Modded HM-2. I did add a CLR and polarity protection diode. Also, this works 100% using a One Spot for 9v power. The LWA LHW did not utilize a V+ or G- plane, Simply, it is a f'in mess.

FYI the trace image was not 100% complete, as I realized what it was mid-process and...

Hi everyone,
I am new on this forum and I thought it could be nice to share the selfmade schematic of my old Guyatone PS-015 Over Drive which sounds fantastic!
As you may see, big part of it is related to the electronig switching system which can be easily replaced by a mechanic mechanic 3PDT with true bypass configuration.
I didn't build it up yet so I cannot guarantee that the schematic is 100% faulty free.
If somebody have comments or finds mistakes, please let me know.
Schematic_Guyatone...

Hello everyone,
After I had already succumbed to various beginner's difficulties and my first attempt at making a noise gate failed miserably, after a while I felt like taking the Noise Gate project into my hands again and instead of immediately reaching for a soldering iron, I started playing around with a breadboard first.
I found a french language guide here ( where the One-Knob Noisegate ( was modified so that it closes without a MOSFET and instead with a BJT.
This initially worked on the...

I recently designed a tremolo circuit for a build I am doing, and I am struggling with it. The basic design is a uni-vibe style LFO (That I took from the EQD The Depths) with an inverting op-amp in unity gain afterward. This powers an LED, which works in conjunction with KE-10720 photosensors that power the bias voltage of an op-amp in a non-inverting configuration. This is doubled and put after two HP or LP filters. I then put another op-amp in to make up gain, and then a treble booster at the...

Hey all, just got a TS9 Tamura mod and I'm going to trace it this weekend and see what the changes are.
The IC is a Magic IC per the ad copy from a very distinct type and manufacturer of a set of TS that sounded great- ha. Anyway, there's no ID on it. Doesn't look sanded off, not sure if its coating, just a BLACK IC. I used a few normal ways to remove ink (dry erase marker followed by alcohol swab, then a fast acetone wipe) and can't even find if there WAS something on there. Honestly looks...

I Got this m wave mini universe reverb pedal some time ago. It sounds absolutely killer, but there's a problem with that lts been there since the beginning and lots of people also experience it.

When engaged, it pops! It pops and introduces this into the reverb sound. The weird thing is, the longer the pedal stays active, the lesser this popping effect becomes when switched on and off. It makes me think of a capacitor issue, but seems like lots of people complain about it on YouTube comments....

Probably a hard one to get details on because it was so rare. But does anyone have a Sola Sound / Rainger FX Freakenbender Tone Bender Fuzz to trace. Would love to build one of those beasts.

I got this pedal quite cheap. It sounds horrible (check the bias voltages on the schematic)

Got it sounding real good by raising the voltage at the collector of Q2 to around 4.8V by placing a 25k trimpot parallel to R5

Harley Benton - Silly Fuzz.JPG

Check the pictures at my blog or insta