Enclosure not stated · 1 knob
EHX Muff Fuzz - Op amp versionVerified
Based on the Electro-Harmonix Muff Fuzz· 14 other boards clone it
From the post
The last layout for a while, I honesly don't know when the next one will be uploaded, probably in january. There is three eye surgeries on the horizon... Anyway, I had athe change to trace an old EHX Muff Fuzz of the op amp variety a few weeks ago. As you know, EHX used parts whatever they had on hand in the 70s so there is lots of different schematics online so I have included several options for some of the values. My unit had a 1458 op amp, silicon diodes, 47nF for C1 and 100k for R7.
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 Dirtbox Layouts. No KiCad fragment has been drawn for this circuit yet.
Parts list 15 rows
Report a wrong parseGot parts in a drawer? See what you can build with them.
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 6 | ||||
| ×2 | 1M | 1M | legend: both 1M resistors were sometimes 680k; read from the layout by eye | |
| ×1 | 2.2M | 2.2M | read from the layout by eye | |
| ×1 | 470K | 470k | read from the layout by eye | |
| ×1 | 100K | 100k | read from the layout by eye | |
| ×1 | 10K | 10k | read from the layout by eye | |
| R7 | ? | ? | value not given; legend: both 100k and 470k were used; read from the layout by eye | |
| Capacitors 5 | ||||
| ×1 | 100pF | 100p | read from the layout by eye | |
| ×2 | 100nF | 100n | read from the layout by eye | |
| C1 | ? | ? | value not given; legend: values between 10-47nF were used; read from the layout by eye | |
| ×1 | 10uF | 10u | electrolytic; read from the layout by eye | |
| ×1 | 47uF | 47u | electrolytic; read from the layout by eye | |
| Diodes 2 | ||||
| ×2 | 1N4148 | 1N4148 | D1, D2; legend: 1N34A in earlier versions; read from the layout by eye | |
| D3 | 1N5817 | 1N5817 | read from the layout by eye | |
| ICs 1 | ||||
| IC1 | 1458 | 1458 | legend: 1458, 4558 or 2458; read from the layout by eye | |
| Potentiometers 1 | ||||
| Volume | B100K | B100k | Potentiometer | legend: 100kB or 50kB; read from the layout by eye |
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