Enclosure not stated · 1 knob
M3 Emthree Mini SynthyVerified
Based on the M3 Emthree Mini Synthy
From the post
This is an obscure octave down fuzz from Italy, manufactued in 70's. The three pontentiometers adjust normal fuzz, one octave down and two octave down. Note that I made small mod to this one since the original SAJ110 IC is long gone obsolete and expensive. It is replaced with a CD4024 binary counter and divider IC.
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 22 rows
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| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 10 | ||||
| ×1 | ? | ? | LED resistor, value not given; read from the layout by eye | |
| ×1 | 47K | 47k | read from the layout by eye | |
| ×1 | 470K | 470k | read from the layout by eye | |
| ×3 | 100K | 100k | read from the layout by eye | |
| ×2 | 33K | 33k | read from the layout by eye | |
| ×2 | 1M | 1M | read from the layout by eye | |
| ×1 | 220K | 220k | read from the layout by eye | |
| ×2 | 330K | 330k | read from the layout by eye | |
| ×1 | 4.7K | 4.7k | read from the layout by eye | |
| ×1 | 680Ω | 680 | read from the layout by eye | |
| Capacitors 5 | ||||
| ×2 | 47nF | 47n | read from the layout by eye | |
| ×3 | 1nF | 1n | read from the layout by eye | |
| ×1 | 1.5nF | 1.5n | read from the layout by eye | |
| ×1 | 100uF | 100u | electrolytic; read from the layout by eye | |
| ×1 | 1uF | 1u | electrolytic; read from the layout by eye | |
| Diodes 1 | ||||
| D1 | 1N5817 | 1N5817 | read from the layout by eye | |
| Transistors 1 | ||||
| ×4 | BC109 | BC109 | Q1-Q4; legend: BC109 or BC239C; read from the layout by eye | |
| ICs 1 | ||||
| IC1 | CD4024BE | CD4024BE | SAJ110 in original; read from the layout by eye | |
| Potentiometers 3 | ||||
| Straight | B500K | B500k | Potentiometer | read from the layout by eye |
| 1 Octave | B500K | B500k | Potentiometer | read from the layout by eye |
| 2 Octave | B500K | B500k | Potentiometer | read from the layout by eye |
| Switches 1 | ||||
| Switch | SPST | SPST | read from the layout by eye | |