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Relay bypass without a microcontroller

2/17/2018

12 Comments

 
I've seen alot of people wanting microcontroller-free relay bypass boards. There's a few designs out there, but most of them seem overly complicated, so I designed this one. It uses two 2N3904 as a simple switch flip flop and debouncer. It's not perfect (the occasional mistrigger happens) but overall it works pretty well for such a simple design. :)
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I'm selling a Relay Bypass PCB in the shop for an improved version (with solid debouncing) with a smaller size than the vero version. Check it out. :)
12 Comments

Simple buffer and phase inverter

10/16/2017

33 Comments

 
Here is a small utility board - a simple buffer followed by a phase inverter. You can take the output from either stage. It can be very useful if you are adding a clean blend to a circuit that is inverting the phase.
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I recommend putting this in front of your main effect, but keep in mind that not all effects will respond the same with a buffer in front. I didn't include polarity protection, DC filtering and an output capacitor since this is meant to be used together with another effect (not stand alone).
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33 Comments

Penfold Auto Waa

9/8/2015

4 Comments

 
Here's a cool  auto wah from Robert Penfold that can sound really funky and bubbly. 
In the soundclip the resonance and depth are maxed.
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I have adapted it for true bypass and added a volume pot since the output was alittle bit above unity. The controls are a bit finicky, especially the frequency controls that goes from low (so low that it kills the signal) to above the hearing range. I think a log pot work better here. I used a 2M resistor insted of the 1.8M and a BC108B transistor with good results. The 10K trimpot sets the input for the envelope follower. Adjust it until it sounds good and you get a "natural" sounding release.
4 Comments

Cruz Drive by Jon Patton

6/28/2015

5 Comments

 
This is Jon Patton's adaption of the Tube Driver, but it uses a JFET insted of a tube. It also has a few extra goodies thrown in such as an 18v chargepump and a mids switch. This circuit sounds very good IMO and has excellent controls and a wide range of tones. Thanks to Jon for sharing his work!
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5 Comments

Radio France Fuzz

6/7/2015

4 Comments

 
Edit 2015-06-12. Layout updated and verified.

Here is a great sounding silicon fuzz made by Davide Gironi.
Original thread here.
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4 Comments

DiSCO - Dirty Compressor and Overdrive

4/7/2015

1 Comment

 
Edit 2015-06-12. Updated the layout slightly to match the latest schematic. Anode of D7 moved down two rows.

Here is another very nice compressor / overdrive. This one is a brand new creation from Sam Hay, the inventor of the Cherub Chorus that I posted a layout for earlier. Read more about it in the original thread here.
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For schotty diode I used a 1N5817 in my build with good results.
1 Comment

Elektor Compression and Distortion

4/7/2015

1 Comment

 
Here is an old circuit from Elektor, a dirty compressor and distortion in one. I was surprised that this one actually sounds really nice. The compression goes from fairly clean and subtle to very compressed and dirty. The distortion isn't bad either. :)
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I didn't have a BF256C, so I tried both a 2N5457 and a BF245B insted with good results. Just keep in mind the pinout. 
1 Comment

Cherub Chorus

2/28/2015

11 Comments

 
Here is another nice PT2399-based chorus, a bit similar to the Dimension P chorus I posted earlier, but uses a single delay chip insted of two.
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11 Comments

ETI Guitar Note Expander

2/21/2015

0 Comments

 
Another CD4007 based circuit. I was hoping this one could deliver some cool sounds. However, I found that many settings of the rotary switch doesn't sound very useful and the overdrive is lacking.
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0 Comments

Nut Cruncher

12/8/2014

2 Comments

 
This is a GREAT sounding mosfet CMOS overdrive/distortion by Gez.
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2 Comments
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