Enclosure not stated · 2 knobs
Old-Style VCF
Schematic
The schematic is the archived file. Open it at Experimentalists Anonymous, or browse its folder.
Parts list 22 rows
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| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 10 | ||||
| ×1 | 360Ω | 360 | from +15V; read from the schematic by eye | |
| ×4 | 1k | 1k | ladder supply, two ladder legs, base to ground; read from the schematic by eye | |
| ×4 | 2k2 | 2.2k | two ladder collectors, bias divider, output emitter; read from the schematic by eye | |
| ×1 | 8k2 | 8.2k | bias divider; read from the schematic by eye | |
| ×1 | 3M3 | 3.3M | output transistor base bias; read from the schematic by eye | |
| ×1 | 1k8 | 1.8k | in series with Resonance; read from the schematic by eye | |
| ×3 | 47k | 47k | audio input, modulation input, cut-off wiper; read from the schematic by eye | |
| ×1 | 68k | 68k | +15V to Cut Off pot; read from the schematic by eye | |
| ×1 | 3k9 | 3.9k | tail; read from the schematic by eye | |
| ×1 | 82Ω | 82 | tail to -15V; read from the schematic by eye | |
| Capacitors 5 | ||||
| ×1 | 1u | 1u | electrolytic, audio input; read from the schematic by eye | |
| ×3 | 4n7 | 4.7n | diode-ladder capacitors; read from the schematic by eye | |
| ×1 | 100n | 100n | read from the schematic by eye | |
| ×2 | 150u | 150u | electrolytic, supply decoupling; read from the schematic by eye | |
| ×1 | 10u | 10u | electrolytic, audio output; read from the schematic by eye | |
| Diodes 1 | ||||
| ×8 | 1N4148 | 1N4148 | diode ladder; read from the schematic by eye | |
| Transistors 2 | ||||
| ×3 | BC547 | BC547 | NPN: differential pair and output follower; read from the schematic by eye | |
| ×1 | BC557 | BC557 | PNP; read from the schematic by eye | |
| Potentiometers 2 | ||||
| Cut Off | B25k | B25k | Potentiometer | 25k lin; read from the schematic by eye |
| Resonance | B1k | B1k | Potentiometer | 1k lin, wired as a variable resistor; read from the schematic by eye |
| Trimmers 1 | ||||
| ×1 | 470k | 470k | 1V/octave input trimmer; read from the schematic by eye | |
| Switches 1 | ||||
| ×1 | SP3T | SP3T | LP/BP/HP mode selector; read from the schematic by eye | |