Enclosure not stated · 3 knobs
Keeley PSIVerified
Based on the Keeley Psi Fuzz· 3 other boards clone it
From the post
Info about the original:
We set out to take a classic design with lots of history and make it obviously something new.
We took the op-amp version of old PI and inverted one of the stages, brought out the midrange, tightened the bass, and most importantly, added a Germanium transistor output!
Yes, this is a opamp-transistor hybrid. Don’t be miffed by op-amps in your pie folks, the germanium touch at the end makes everyone smile around the shop here.
Schematic
This is a board layout, a drawing of where each part goes, and the post may link the schematic it was drawn from. Open the layout at Tagboard Effects. No KiCad fragment has been drawn for this circuit yet.
Parts list 33 rows
Report a wrong parseGot parts in a drawer? See what you can build with them.
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 16 | ||||
| ×3 | 220K | 220k | read from the layout by eye | |
| ×3 | 100K | 100k | read from the layout by eye | |
| ×1 | 33K | 33k | read from the layout by eye | |
| ×1 | 510K | 510k | read from the layout by eye | |
| ×1 | 47K | 47k | read from the layout by eye | |
| ×1 | 47R | 47 | read from the layout by eye | |
| ×1 | 22K | 22k | read from the layout by eye | |
| ×1 | 15K | 15k | read from the layout by eye | |
| ×1 | 470K | 470k | read from the layout by eye | |
| ×1 | 3K3 | 3.3k | read from the layout by eye | |
| ×1 | 5K6 | 5.6k | read from the layout by eye | |
| ×1 | 1M | 1M | read from the layout by eye | |
| ×1 | 10K | 10k | read from the layout by eye | |
| ×1 | 1K5 | 1.5k | read from the layout by eye | |
| ×1 | 8K2 | 8.2k | read from the layout by eye | |
| ×1 | 1K2 | 1.2k | read from the layout by eye | |
| Capacitors 10 | ||||
| ×4 | 1u | 1u | film box; read from the layout by eye | |
| ×1 | 470n | 470n | read from the layout by eye | |
| ×1 | 220n | 220n | read from the layout by eye | |
| ×1 | 100n | 100n | read from the layout by eye | |
| ×1 | 120n | 120n | read from the layout by eye | |
| ×2 | 10n | 10n | ceramic; read from the layout by eye | |
| ×1 | 1n | 1n | ceramic; read from the layout by eye | |
| ×1 | 220p | 220p | ceramic; read from the layout by eye | |
| ×2 | 10u | 10u | electrolytic; read from the layout by eye | |
| ×1 | 100u | 100u | electrolytic; read from the layout by eye | |
| Diodes 1 | ||||
| D1 | 1N34A | 1N34A | read from the layout by eye | |
| Transistors 1 | ||||
| ×1 | AC187 | AC187 | germanium NPN; read from the layout by eye | |
| ICs 1 | ||||
| ×1 | TL074 | TL074 | read from the layout by eye | |
| Potentiometers 3 | ||||
| Voltage | A10K | A10k | Potentiometer | read from the layout by eye |
| Cream | A50K | A50k | Potentiometer | read from the layout by eye |
| Voice | B10K | B10k | Potentiometer | read from the layout by eye |
| LEDs 1 | ||||
| ×2 | LED | LED | D2, D3, clipping LEDs; read from the layout by eye | |
Other boards based on the Keeley Psi Fuzz
- Keeley Psi Fuzz Dirtbox Layouts
- Keeley Psi Fuzz Effects Layouts (blog)
- Kinetic Fuzz PedalPCB · 125B · $8.00