In this implementation all manner of transistor drive and fuzz tones are available - the input capacitor blend alone can tailor the character across a big range and it even does lower gain quite well. After some breadboarding and SPICE experimentation I discovered that it shuts off the waveform at the peak of each cycle, producing a frequency "doubling" effect unlike a rectifier-based design. A few such designs feature a PNP/NPN clipping cell which caught my attention. It takes some inspiration from the Escobedo/Devi Ever lineage of transistor fuzz (one of the first pedals I ever owned was a Devi Ever Hyperion), which are haphazard yet undoubtedly brilliant. This is a six-transistor silicon fuzz/drive with some unusual sounds at extreme settings. The original also runs the chips at +/-16V which is possible but takes up a lot of PCB space, so this one uses a charge pump for +/-9V bipolar operation and the gain is reduced slightly to mitigate clipping at the input. A "bad" op amp like an LM1458 might actually sound better at high gain - the originals used LM307 op amps which are close to the LM301 in design. Any dual op amp which is pin-compatible with a TL072 should work. These amps are known for their clean tones, but the trashy op amp distortion is in a class of its own. The topology looks a lot like a Fender preamp, with impedances scaled to suit op amp operation rather than vacuum tubes. Simple op amp preamp inspired by the MusicMan HD65, HD130, etc.
SIMPLE DELAY PEDAL SCHEMATIC SERIES
( Build Document) Musicman HD Series Preamp And use a big enclosure to have more room for tone. If you can find one use an LM386N-4 for best results, as other versions can have a sputtery note decay.
SIMPLE DELAY PEDAL SCHEMATIC FREE
The build document has suggested part numbers but feel free to experiment. Does it sound better? Debatable, but it looks rad. ( Schematic) Mojo TitanĪn homage to the almighty Sonic Titan power amp distortion, which uses an LM386 IC for its unique distortion characteristics. This build uses "mojo" parts such as mil-spec resistors and oversized film caps. It fits in the same size enclosure and the PCB layout is also on OSH Park. I also drew up an FX10+ which runs at about +/-17V, in case you want more headroom than you'll ever know what to do with. ( Build Document - note this is out of date, use at your own risk) This is a good beginner to intermediate project. The build document references the older layout so in the mean time you can use the schematic and BOM for reference.
We sold a bunch of these boards but we will be updating the layout into a more compact form for open source availability. It does a great job of warming up a thin guitar or brightening up muddy pickups. This was a collab with my friend Scot at S&K pedals, who also occasionally helps build our custom shop units. It's a secret weapon in many rigs, as running it after a distortion or fuzz pedal can produce extra heavy or cutting tones. The DOD FX10 Bi-Fet is a simple and incredibly powerful op amp preamplifier/booster.
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