1590A · 2 knobs
D*A*M FR-70 FuzzRongVerified
Based on the D*A*M FR-70 FuzzRong· 1 other board clones it
From the post
This is DAM's take on the silicon FuzzRite. Loud, snarly, and nasty fuzz tones in this circuit. Q1 is a KSP42, which seems to be pretty similar (if not the same) to a MPSA42. I've read of MPSA18s working in that spot as well. Q2 is a 2N4401, which should be easier to track down, though a 2N3904 should work just fine there as well. As always, socket and experiment. The depth pot is listed at 470k, but a 500k will work just fine. I've added power filtering, polarity protection, and an LED resistor on board and the whole thing should fit nicely in a 1590a.
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 Effects Layouts (blog). No KiCad fragment has been drawn for this circuit yet.
Parts list 15 rows
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| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 5 | ||||
| ×3 | 470K | 470k | read from the layout by eye | |
| ×1 | 2.2K | 2.2k | read from the layout by eye | |
| ×1 | 220K | 220k | read from the layout by eye | |
| ×1 | 1M | 1M | read from the layout by eye | |
| ×1 | 100K | 100k | read from the layout by eye | |
| Capacitors 5 | ||||
| ×2 | 47nF | 47n | read from the layout by eye | |
| ×1 | 1nF | 1n | read from the layout by eye | |
| ×1 | 22nF | 22n | read from the layout by eye | |
| ×1 | 220pF | 220p | read from the layout by eye | |
| ×1 | 47uF | 47u | electrolytic; read from the layout by eye | |
| Diodes 1 | ||||
| ×1 | 1N4001 | 1N4001 | read from the layout by eye | |
| Transistors 2 | ||||
| Q1 | KSP42 | KSP42 | read from the layout by eye | |
| Q2 | 2N4401 | 2N4401 | read from the layout by eye | |
| Potentiometers 2 | ||||
| Depth | B470K | B470k | Potentiometer | read from the layout by eye |
| Volume | B100K | B100k | Potentiometer | read from the layout by eye |
Other boards based on the D*A*M FR-70 FuzzRong
- DAM FR70 FuzzRong Tagboard Effects