Getting this thread started as a new release that is getting a LOT of attention and I don't see any discussions yet on FSB!

This vintage octave-up/ring modulator showed up on Reverb for just a few days. Here are the seller's pics if anyone wants to trace it. The only adjustments are two trim pots. The instructions are posted on Effects Database and are included here for continuity. Apparently Thurlby is still in business in the UK, as Aim-TTi (Thurlby Thandar Instruments) which manufactures test equipment and power supplies.

Thurlby front.png
Thurlby angle.png
Thurlby jacks.png
Thurlby back.png
Thurlby...

Hello,
I want to revive my Big Jam SE-5 flanger pedal. It uses the SAD512d (8-pin chip, different from the original SAD512) delay line, and it appears that's the component that's gone faulty in my unit. It seems these chips are commonly failing now, and unfortunately appear to be rare and expensive when they do work.

I've seen that the R5106 was a drop-in replacement chip back in the day, but even those are scarce now.

But I've also heard that the RD5106ANP should work (though the datasheets...

Do I need to unsolder the jacks?

This is a very simple buffered splitter project. You can use it to create two equal outputs for your guitar or another pedal. This is handy for running a stereo amplifier setup, splitting a single signal into two effects pedals, or any of several other applications in which you need to have two equal, buffered outputs. The circuit consists of a simple transistor input buffer that feeds a pair of parallel op amp-based output buffers.

From an EE perspective, this isn't a perfect circuit. From a...

What sort of psychotic madman would do this....
I've worked on Mutron Filters over the years, including a month ago but this is insane.

They stuffed it in the control cavity
Topology looks different, three batteries - one for the LED's, two for power or it has a separate power supply box with multi pin cable.
Several intermittent things, looks like a severe pain to work on.

Hi there,

I have a green box MXR 118 Analogue delay that i have brought back from the dead and am trying to align but cannot find the alignment procedures for clock frequency and location of trim pots anywhere...

It is the SAD1024 version with 118-3001 102 board.

I have found a couple of alignment sheets on here but they are for the PT2399 modded version and refer to trim at point A with no reference to what point A is.

Thanks,

Hi guys, i have here a musikding Engineering thumbs Compressor kit that is not working!

Schematic:

Guts Shot

Since i’m not the one who mounted the kit, i checked every component polarity etc. resolder a bunch of holes, and identified a wrong transistor in the circuit. It was with a BC337 instead of a BC327.
I changed the transistor, but its somehing else wrong.
I have bypass sound. When its on, seems like there’s no effect applied. Level pot its working , the other ones i can’t notice...

New Joyo fuzz that I just got from Amazon. It’s definitely a big muff clone of some sort. Someone on Reddit said it was a Swollen Pickle clone and I don’t hear that at all. Probably just taking that from the name. I had the original three knob Swollen Pickle and it was literally the most bassy and scooped pedal I've ever used. 100% unusable in a band setting, my guitar was gone the second I stepped on it. This Joyo has good midrange content and tons of gain. Sounds like a rams head or triangle...

Greetings! Been looking for pictures of this thing with no luck. Was wondering if anyone would mind taking pictures of one of these? Thank you!

I built an EQD Crimson Drive version 2 clone three years ago
using a PCB I developed myself.
I used a BFW12 JFET, the pedal worked well.

Using BFW12:
EQD_CrimsonDriveVersion2 BFW12 Schematic.jpg
Crimson Drive PCB BFW12.JPG
Ready-to-Print PDF-files:
Crimson Drive PCB BFW12 Componets Side.pdf
Crimson Drive PCB BFW12 Solder Side.pdf
Gerber & Drill files:
EQD_CrimsonDriveVersion2 BFW12 Gerber & Drill files.zip

Using J201:
Voltages were read in the original pedal....

Had a quick look inside this one the other evening.
Light wasn't great for photos and I didn't do a full tracing.

Components match VERSION 9 NYC REISSUE BIG MUFF PI . First version with 3003 PCB. NPN transistors
on this page

Most of the component references match up with the Kit Rae schematic too.
Resistors are SMD.
All caps are full size, no SMD caps.
All transistors are full size 2N5088.
Clipping diodes are 1N6263
All pots are B100k.

Voice switch
============
Switches the C9 capacitor...

IMO a really good sounding distortion with a pretty good range of settings.
Heavy metal housing, good mechanical and electrical workmanship.
ONERR DST-2 Topview.jpg
ONERR DST-2 Knobs.jpg
OnerrDST-2_PCB_Componets.jpg
OnerrDST-2_PCB_SolderSide.jpg
OnerrDST-2_PotentiometerPCB.jpg
OnerrDST-2_Wiring.jpg
OnerrDST-2_PCB_Layout.JPG
ONERR DST-2 Schematic.JPG

Hi,

I'm an absolute beginner. I have a Donner Ultimate Comp I purchased seven years ago and the new model doesn't sound as good. The old model has a loose power jack. How hard would it be to fix that? I don't want to mess up my pedal if they don't make them like they used to anymore. It works fine but I think it was shorting out another pedal when on a daisy chain. I've put it on it's own power supply since then, and no more daisy chains. Any advice would be appreciated! :worship:

FYI,

I received a yellow Colorsound Wah/Fuzz/Swell, probably dated ca. 70ies pedal to replace the scratchy pot. The pedal had been in repair for that, but the owner re-installed the original pot again because the pedal did not behave right after the installation of the new pot. This has several reasons (see lateron). Since changing the pot(s) on this pedal presents a problem I would like to share with you how I managed to fixed it. Skip on to the quintessence on the bottom if you do not want...

A few years ago I made this MXR Distortion Plus PCB clone and now I have reworked it using SprintLayout 6.0 .
MXR_plus2_Layout.JPG
Ready-to-print PDF-files:
MXR_plus2_componets side.pdf
MXR_plus2_solder side.pdf
SprintLayout 6.0 file:
MXR_plus2.zip
Gerber & Drill files:
MXR_plus2_gerber & drill.zip