Flash Filter Fuzz

Update 2015-03-29: I added a vero layout of the deluxe version. Thanks to Synsound at the tagboardeffects forum for verifying!

Here is a new original design. :)

The Flash Filter Fuzz is a inverter-based squarewave fuzz with a resonant highpass filter and sample & hold modulation. I made layouts for two different versions, a standard and "deluxe" version.

Here is a demo-video of the deluxe version (modulation starts at about 4:00)

I found this pedal kinda hard to demo, but you should get the idea. :)

The controls are as follows:
Intensity: This controls the strenght of the resonant peak. Turn it up and it will oscillate.
Resonance: This controls the frequency of the filter cutoff/peak.
Rate: Controls the speed of the sample and hold modulation.
Bias: This controls the depth and range of the sample and hold modulation. It was originally intended as a internal trimpot, but I found it very useful as an external pot. Ultimatly it should been two different pots to control both range and depth, so the 200K pot is a bit of a compromise, hence the not so perfect sweeping action.
S&H switch: This is a on/off/on switch that has 3 different modes; LFO disengaged, LFO free running and LFO gated by the guitar signal.

With the LFO free running and the intensity turned up into oscillation the circuit turns into a synth/noisemaker thingy. :D

---

Deluxe version layout and schematic:

flash_fuzz_deluxe_PCB.pdf
File Size:	156 kb
File Type:	pdf

Download File

---

flash_deluxe_vero.png
File Size:	233 kb
File Type:	png

Download File

---

flash_fuzz_deluxe_schem.pdf
File Size:	68 kb
File Type:	pdf

Download File

---

---

Standard version PCB and vero layouts:
This version doesn't have the sample and hold modulation and is alot simpler to build. It's also tuned slightly different so that it doesn't oscillate with the intensity turned up.

flash_fuzz_PCB.pdf
File Size:	110 kb
File Type:	pdf

Download File

---

flash_filter_fuzz.png
File Size:	123 kb
File Type:	png

Download File

---