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NG-4 Fuzz
Bootstrapping is great , I said as much myself. Sometimes that love gets a bit too far, sometimes you build a whole career on it. Either...
Aug 28, 20242 min read
314 views
0 comments

Bijous: pretty BJT overdrives
Also on FSB! https://www.freestompboxes.org/viewtopic.php?p=297316 Introduction Electric guitarists have been long enamored with...
Dec 27, 20239 min read
782 views
1 comment


Chewborg Envelope Filter
Introduction On my quest through re-imagining effects pedals, I felt like envelope-controlled filters deserved some attention. As it is...
Aug 6, 20239 min read
721 views
1 comment

"That" compressor
I had wanted to make a compressor circuit for a long time, because it's a popular and somewhat easy to make effect, but the existing DIY...
Jun 30, 202310 min read
953 views
5 comments

Trembling Satellite tremolo
The Tremulus Lune is by far the most popular DIY tremolo project, and for good reasons: it's a simple enough circuit that does all you...
Jun 4, 20235 min read
556 views
2 comments

Cable shielding tester
There are times when instrument cables let through an unacceptable amount of interference, usually from mains. It could be a faulty cable...
May 27, 20233 min read
165 views
1 comment

CMOS multi-waveform generator
Anyone who has done any considerable amount of repairs and troubleshooting knows the importance of having a signal generator. For audio...
May 18, 20235 min read
390 views
4 comments

Pevy Knave Guitar Preamplifier
Check also the FSB thread! Peavey, Pavey, Pevy, or is it Pee-vee? One of my favorite amplifiers is still to this day the Peavey Bandit...
Apr 28, 202310 min read
499 views
0 comments

Morley M2 Volume Wah (M2WA) schematic
There's not much information about this series from Morley. This company seems to have tried many different control schemes for the wah,...
Apr 27, 20232 min read
118 views
0 comments

Mooer Micro DI schematic
I've got my hands on an undersized Mooer Cabsim/Balanced driver pedal, and without even sparing any time actually trying how it sounds,...
Apr 24, 20232 min read
253 views
0 comments

MXR M-151 Doubleshot schematic tracing
I had the chance to get my hands on the MXR Doubleshot for a little while, and found out there are no available schematics anywhere. It's...
Apr 2, 20234 min read
164 views
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FBT mini club schematic schema
Let's keep the parade of old Italian amplifiers going. This is a very small and lightweight combo amplifier from, I guess, the late 70s....
Mar 7, 20231 min read
175 views
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FBT Mini-Maxi 52 schematic schema
Second in the series, this is an old Italian transistor amplifier that has been in my house for a very long time. It doesn't sound very...
Mar 1, 20231 min read
133 views
0 comments

"True" MOSFET clipping at 9V? Green Turtle overdrive and other applications
MOSFETs, the incredible devices at the core of modern devices, computers, power supplies and… distortion pedals? For some reason, there’s...
Feb 23, 20236 min read
568 views
0 comments

Meazzi Emthree M3 Studio 30 schematic schema
Although this site is mostly dedicated to my own original circuits and builds, I've originally envisioned it as something wider, to...
Feb 22, 20231 min read
167 views
0 comments

Pelota 2: PT2399 delay
Check also the FSB thread It’s been a couple of years since I’ve made the first Pelota delay: from the very name, it was a circuit...
Jan 21, 202314 min read
790 views
2 comments

LFOstortion
Just as I was finishing working on the Enveloping Timbre, I realized I could try different kinds of control voltages, such as a LFO to...
Dec 4, 20222 min read
272 views
0 comments

Enveloping Timbre: envelope distortion
Keep the clarity of your attack before letting the distortion embrace you: the best of both worlds! At least that was the original idea...
Nov 28, 20229 min read
385 views
1 comment


PUP: a host of Perfectly Usable Phasers
I’ve always liked phasers, in fact one of my first pedals I’ve ever built was a Phase 45 clone. Not only I liked how it sounded, another...
Oct 22, 202215 min read
1,116 views
2 comments

Dudson Narrowcast V2
This is a circuit I've made a little more than a year ago, as an answer to a very popular distortion pedal based on preamplifiers of the...
Oct 6, 20225 min read
1,000 views
5 comments
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