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#31
Build Reports / Re: Moka Pot Fuzz [Harmonic Pe...
Last post by jessenator - November 27, 2025, 04:04:35 AMQuote from: Aleph Null on November 27, 2025, 01:50:32 AMOne of these days I'm gonna put a moseft boost in a 1590XX just to spite you!
#32
Build Reports / Re: Moka Pot Fuzz [Harmonic Pe...
Last post by gordo - November 27, 2025, 02:44:54 AMSuperb! I love the Velcro fuzz stuff but your lower gain stuff, like what you did with the Peacock, is killer too.
#33
Build Reports / Re: Moka Pot Fuzz [Harmonic Pe...
Last post by Aleph Null - November 27, 2025, 01:50:32 AMOne of these days I'm gonna put a moseft boost in a 1590XX just to spite you!
#34
Build Reports / Re: Moka Pot Fuzz [Harmonic Pe...
Last post by jessenator - November 26, 2025, 11:22:31 PMStellar as always! Even if the box is too capacious
#35
Build Reports / Moka Pot Fuzz [Harmonic Percol...
Last post by Aleph Null - November 26, 2025, 10:24:18 PMThis is my highly tweakable take on the Harmonic Percolator. I've added a modified Push-Me-Pull-You in series for octave fuzz goodness.
Water slide decal on bare aluminum for the graphics. I wanted the metallic look of a Moka Pot.
I used my standard I/O and bypass layout.
A mosfet boost feeds the fuzz section to allow for more saturation. This is especially important as I decided to leave out clipping diodes. They just seemed to mask the character of the fuzz. The Lows control is pre-fuzz. From fully clockwise to noon, it tightens up the fuzz response. Below noon it noticeably attenuates low-end content. The Gain control is just a volume control for the boost output, which feeds the Harmonic Percolator section. I arrived at the values here after much experimentation, trying to get as much tonal variation as possible. The Highs control uses negative feedback to attenuate treble in the Q2 gain stage. Placing it here effectively cuts high-end content without masking the character of the fuzz. Clang sets the bias of Q3 (which in turn effects the bias of Q2). This goes from smooth saturation when counterclockwise (think Albini values), up through the spitty ripping-velcro type sounds the percolator is known for, and into farty misbiased octave down sounds as you move clockwise. Lastly, Octave blends in a separate octave up circuit, which is based on Tim Escobedo's Push Me Pull You, and is optimized to compliment the fuzz. As this sub-circuit comes after the boost and percolator sections, it is sensitive to the other controls.
I'm pleased wth this design. It gets all the sounds I'd want from a Harmonic Percolator while remaining farily ugly proof (for a fuzz).
Here's a demo:
As always, I have extra PCBs. If anyone is interested in building one, DM me.
Water slide decal on bare aluminum for the graphics. I wanted the metallic look of a Moka Pot.
I used my standard I/O and bypass layout.
A mosfet boost feeds the fuzz section to allow for more saturation. This is especially important as I decided to leave out clipping diodes. They just seemed to mask the character of the fuzz. The Lows control is pre-fuzz. From fully clockwise to noon, it tightens up the fuzz response. Below noon it noticeably attenuates low-end content. The Gain control is just a volume control for the boost output, which feeds the Harmonic Percolator section. I arrived at the values here after much experimentation, trying to get as much tonal variation as possible. The Highs control uses negative feedback to attenuate treble in the Q2 gain stage. Placing it here effectively cuts high-end content without masking the character of the fuzz. Clang sets the bias of Q3 (which in turn effects the bias of Q2). This goes from smooth saturation when counterclockwise (think Albini values), up through the spitty ripping-velcro type sounds the percolator is known for, and into farty misbiased octave down sounds as you move clockwise. Lastly, Octave blends in a separate octave up circuit, which is based on Tim Escobedo's Push Me Pull You, and is optimized to compliment the fuzz. As this sub-circuit comes after the boost and percolator sections, it is sensitive to the other controls.
I'm pleased wth this design. It gets all the sounds I'd want from a Harmonic Percolator while remaining farily ugly proof (for a fuzz).
Here's a demo:
As always, I have extra PCBs. If anyone is interested in building one, DM me.
#36
VFE Projects / Re: VFE Ice Scream
Last post by caspercody - November 25, 2025, 11:29:37 PMThanks!!
I love the sound of the Nobels overdrive, and the flexibility of the Ice Scream pedal. Was kind of hoping to try to get the smooth overdrive out of my Ice Scream build by changing the diode configuration in the negative loop and adding the hard clipping of the Nobels
I love the sound of the Nobels overdrive, and the flexibility of the Ice Scream pedal. Was kind of hoping to try to get the smooth overdrive out of my Ice Scream build by changing the diode configuration in the negative loop and adding the hard clipping of the Nobels
#37
Open Discussion / Re: Naughty Chimp
Last post by redkurn - November 22, 2025, 09:05:48 AMcool, that might help a bit to understand what bean did since the schematic he mentions is where this whole curiosity began.
#38
VFE Projects / Re: VFE Ice Scream
Last post by madbean - November 22, 2025, 05:55:54 AMThe only appropriate place to add hard clipping would be after IC2.1 and before the Hi Cut control. I'm not sure that this style of circuit would benefit from that option, though.
#39
Open Discussion / Re: Naughty Chimp
Last post by jessenator - November 21, 2025, 11:38:17 AMQuote from: redkurn on November 21, 2025, 09:49:24 AMwhat ever happened to the pcb, pdf etc? been looking for it and the drawing above also references the schematic i found that bean posted a couple years ago. trying to work out what was modded so maybe i can teach myself. finally.https://www.madbeanpedals.com/forum/index.php?topic=34623.msg331057#msg331057
I believe the corrected schematic linked in the post above is where it's at. might start by comparing it to Robert's 1:1 trace to see what the mods are.
Far as a board goes, the one layout posted earlier in this thread might be a jumping off point, but might not be based on the final schematic Bean posted above.
#40
Open Discussion / Re: Naughty Chimp
Last post by redkurn - November 21, 2025, 09:49:24 AMwhat ever happened to the pcb, pdf etc? been looking for it and the drawing above also references the schematic i found that bean posted a couple years ago. trying to work out what was modded so maybe i can teach myself. finally.