Here's an odd one
made in Italy, with help from Gary Hurst.

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Hi
Newbie here

I have a Daphon E20CH Chorus pedal which came to me in a broken state, though was an easy fix, and now I'm wondering if I can give it some improvements to make it as quiet as possible and maximise its performance.

It's using the MN3207/MN3102 BBD pair, plus there's a MC4558 and 022D JRC (an 8-pin amp chip). There's 8-10 X C1815 transistors. Most of the caps are green polys - plus several cheap-brand electrolytics. The resistors all appear to be carbon film, the PCB is...

PDF: Electronics-Today-1987-05-OCR-Page-0050.pdf

Electronics-Today-1987-05-OCR-Page-0050.jpg

This one was a tricky bugger.
I am quite unsure about the accuracy of the trace, since I omitted all switching, but here's my shot at it.

Seems to be fairly similar to the Boss DS-1, missing one gain stage that gets added at the end. Horrid sounding crap through my Laney, even the abominable stock DS-1 sounds slightly better than this. But again, will tinker with it and see what mods are doable 8)

This 2nd gen of Arion pedals incorporate a second output with the ability to switch between...

(｡･∀･)ﾉﾞHi everyone, good morning, noon, and evening
I made a relay bypass version of bd2
IMG_20220327_1709A42.jpg

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Here is the schematic

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This is the pcb for decoration

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mounted on the circuit board

Boss BD2 RealyBypass.zip
As well as circuit board fabrication files, and schematic drawings in PDF format

Full article on gain control in PDF: Electronics Today AUS 01 1979 Gain Control Fuzz.pdf

Electronics Today AUS 01 1979 Gain Control Fuzz.jpg

Sorry to :beatdeadhorse: , but I love Zonk machines! No one likes the sound of the Zonk II (including myself, until now). To me it sounded dark and had a weird abrupt cutoff about the notes...especially lower power chords and the higher single note runs. I attributed this to just being a crap circuit, but after adjusting the bias I changed my mind. I replaced the q2 collector resistor (10k) with a pot (as close to 10k as you have.) I used an audio pot, but a linear would probably work better. I...

PDF: Le HAUT-PARLEUR n°1441 - 7 Février 1974 Fuzz tonalité.pdf

Le HAUT-PARLEUR n°1441 - 7 Février 1974 Fuzz tonalité 02.jpg Le HAUT-PARLEUR n°1441 - 7 Février 1974 Fuzz tonalité 03.jpg

Dear all,
somebody have the schematics of this stomp box?
I found one but it doesn't work and I'd like to repair it.

Radio-Electronics-1963-05-OCR-Page-0069.jpg

The French article that was the source for this circuit, seems to be:
AMPLIFICATEUR GUITARE 5 W (ECC83, ELL80 , EZ80), BF REALISATIONS (p. 46 dans Le Haut parleur n° 1061 mars 1963)
But it's sadly not available digitally, as far as I can tell.

PDF: HP1656_05-1980 Pedale fuzz sustain noise gate.pdf

HP1656_05-1980 Pedale fuzz sustain noise gate 01.jpg HP1656_05-1980 Pedale fuzz sustain noise gate 02.jpg HP1656_05-1980 Pedale fuzz sustain noise gate 03.jpg HP1656_05-1980 Pedale fuzz sustain noise gate 04.jpg

PDF: ETI-CA-1980-01 Struss Fuzz.pdf

ETI-CA-1980-01 Struss Fuzz 01.jpg ETI-CA-1980-01 Struss Fuzz 02.jpg ETI-CA-1980-01 Struss Fuzz 03.jpg

PDF: Electronics-Today-1990-06 Fecko Box Fuzz Echo.pdf

Electronics-Today-1990-06 Fecko Box Fuzz Echo 01.jpg Electronics-Today-1990-06 Fecko Box Fuzz Echo 02.jpg Electronics-Today-1990-06 Fecko Box Fuzz Echo 03.jpg Electronics-Today-1990-06 Fecko Box Fuzz Echo 04.jpg Electronics-Today-1990-06 Fecko Box Fuzz Echo 05.png

Low gain fuzzy overdrive “Schlager.Fuzz”

I like to present an overdrive / low gain fuzz—a lockdown project:

Starting from a fuzz face with lower beta germanium transistors, a fuzz circuit was tweaked to lower gain, softer clipping and the ability to handle (fat sounding) humbuckers:

schlager_fuzz_realized_en_grosz.gif

Low cut / mid boost including low cut control was inserted before input—to allow using guitars with “fat” pickups.

Low cut condenser value / low cut frequencies could be...

Here’s a PCB I made that uses the part numbers from the Big Muff Page. Find a schematic there and populate this board!

Here is an Elk Electrosound I did.

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Hi All!

Many years ago I put out a free ' Pedal Builder's Vector Pack ' to help my fellow DIY'ers design, plan, test-fit and drill their pedals. I've been hard at work on Version 2 for six months now, it's grown to 20 pages with 200 illustrations :shock: For version 2, I've gone the Etsy route to help offset my labor costs. It's got lots of new knobs, hardware, enclosure sizes, drilling templates, etc. Hope some of you who have been using version 1 or are just hearing about this now will get...

Hi folks, I've got one of the above units (the 3 switch version) in for a repair. It works for all of 10 minutes then cuts out/goes glitchy and really fuzzy (way more than it should, sounds like the speaker has gone).

I've been in touch with Tech 21 and had a lengthy hack and forth but I'm not getting much luck. I've found a schematic on this site so that's a start but the jacks need de-soldered to get the board out to inspect it. Do any of you have any ideas on what I should check when I do...

hello guys, is there any store that sells fuzz face style enclosure?
thanks

So I've had this old green sticker BF-2 that never worked. I was from a guy who passed, wife sold his pedals and I bought it. It was cheap and felt bad about complaining so I kept it for about a decade at this point.

The issue is: the pedal definitely suffered some water damage. You can see the rust in the board and inside the pedal. It was probably partially submerged for a while.

The pedal turns on and sound passes through, but there is no effect to be heard. You can maybe hear a...

A fun variation on the classic D+/250 style circuit that nobody asked for. I like the original but wanted a little more flexibility from it.

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IC1 is a precision Vref supply which I like to include when I can.

IC2 is a super useful variable capacitance multiplier, borrowed from the page on gyrator filters at you can read more on it there. Here's its used to get a Timmy-style pre-clipping bass control but by virtually changing the capacitor value in the feedback network, as opposed...

Hi all.
I came across this forum looking for a volume fix for a DOD FX50B and I found it, which was really great after not using that pedal for that particular issue.

So... I began playing the thing through some amps and finally got to my little Fender Frontman 15 which we all know are not quality amps.
That being said, I won't sell it and got to think about modding it up:

1.- Adding a reverb tank. It has the circuit printed, so... could I just solder the missinf components and build a tank...

When opening up the case of my MXR carbon copy the stomp switch fell apart. I replaced it but now the pedal does not pass signal. Well, actually you still can hear the pop being delayed when either the battery or input is plugged in with the pedal turned ON. There is no signal with switch in both positions otherwise.

I have soldering experience working on tube amps but little on pedals and PCB's. I wonder if I damaged the board or something? The original switch was a major pain to get out and...

PDF: ETI-Guide-to-Making-Music-1988 Flanger.pdf

ETI-Guide-to-Making-Music-1988 Flanger 1.jpg ETI-Guide-to-Making-Music-1988 Flanger 2.jpg ETI-Guide-to-Making-Music-1988 Flanger 3.jpg

Amtron UK835 - Guitar Preamplifier.pdf
Amtron UK835 - Guitar preamplifier_2.pdf

Amtron UK835 - Guitar Preamplifier 1.jpg Amtron UK835 - Guitar Preamplifier 2.jpg Amtron UK835 - Guitar Preamplifier 3.jpg Amtron UK835 - Guitar Preamplifier 4.jpg Amtron UK835 - Guitar Preamplifier 5.jpg

Amtron UK857 - Guitar fuzz box.pdf

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