Enclosure not stated · 3 knobs
Schematic
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Parts list 58 rows
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Check before you build · 7 values the reader of this schematic was not sure of
- All-pass ground resistors: read as 22K but could be 220K or 330K, the scan is too coarse
- 4700 count: 12 assumed, one may be 3900
- C3: 1uF or .1uF
- C4: drawn 1000, assumed pF
- A9 feedback 3900 vs 3300 and the 8200 to ground
- LED/diode marked #681 in the PSU
- Most designators are illegible; quantity refs used
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 28 | ||||
| ×2 | 390K | 390k | input pulldown and A1 feedback; read from the schematic by eye | |
| ×1 | 3900 | 3.9k | input series; read from the schematic by eye | |
| ×12 | 4700 | 4.7k | all-pass stage input and feedback resistors, plus A2 stage; count approximate, one may read 3900; read from the schematic by eye | |
| ×1 | 8200 | 8.2k | A2 non-inverting input; read from the schematic by eye | |
| ×6 | 22K | 22k | all-pass stage resistors to ground; could be 220K, last one could be 330K; read from the schematic by eye | |
| ×1 | 10K | 10k | R18, feedback send from phase output; read from the schematic by eye | |
| ×1 | 10K | 10k | R20, output mixer A9; read from the schematic by eye | |
| ×1 | 3900 | 3.9k | A9 feedback; could be 3300; read from the schematic by eye | |
| ×1 | 8200 | 8.2k | A9 input to ground; could be 3200; read from the schematic by eye | |
| ×1 | 18K | 18k | R30 output pulldown; read from the schematic by eye | |
| ×1 | 560 | 560 | output series; read from the schematic by eye | |
| ×2 | 100 | 100 | PSU, regulator transistor base feed; read from the schematic by eye | |
| ×2 | 2000 | 2k | PSU zener bias R46/R47; read from the schematic by eye | |
| ×1 | 2200 | 2.2k | PSU, in series with the LED/diode; read from the schematic by eye | |
| ×1 | 47K | 47k | R32, LFO; read from the schematic by eye | |
| ×1 | 68K | 68k | R33, LFO; read from the schematic by eye | |
| ×1 | 120 | 120 | under Rate pot; read from the schematic by eye | |
| ×1 | 39K | 39k | R35, LFO integrator input; read from the schematic by eye | |
| ×1 | 560 | 560 | under Depth pot; read from the schematic by eye | |
| ×1 | 3300 | 3.3k | R38, trimpot leg; read from the schematic by eye | |
| ×1 | 47K | 47k | R39; read from the schematic by eye | |
| ×1 | 2200 | 2.2k | R40; read from the schematic by eye | |
| ×1 | 68K | 68k | R37, into lamp driver op amp; read from the schematic by eye | |
| ×1 | 3600 | 3.6k | R41; read from the schematic by eye | |
| ×1 | 220K | 220k | R42; read from the schematic by eye | |
| ×1 | 1K | 1k | R43; read from the schematic by eye | |
| ×1 | 220 | 220 | R44, in series with TP2; read from the schematic by eye | |
| ×1 | 68K | 68k | R45; read from the schematic by eye | |
| Capacitors 14 | ||||
| ×1 | .047uF | 47n | C1 input, drawn .047; read from the schematic by eye | |
| ×1 | 33pF | 33p | C2; read from the schematic by eye | |
| ×1 | 1uF | 1u | C3 across A1 feedback; drawn '1 mf', could be .1; read from the schematic by eye | |
| ×1 | .001uF | 1n | C4 across A2 feedback, drawn 1000 (pF assumed); read from the schematic by eye | |
| ×1 | 3300pF | 3.3n | C5, drawn 3300; read from the schematic by eye | |
| ×6 | 6800pF | 6.8n | all-pass stage caps C6-C11, drawn 6800; read from the schematic by eye | |
| ×1 | .47uF | 470n | C12 phase output; read from the schematic by eye | |
| ×1 | 1uF | 1u | C13, electrolytic, drawn 1mf; read from the schematic by eye | |
| ×1 | 220pF | 220p | C14 across A9 feedback; read from the schematic by eye | |
| ×1 | 10uF | 10u | output coupling, drawn 10mf; read from the schematic by eye | |
| ×2 | 470uF | 470u | PSU filter, drawn 470mf; read from the schematic by eye | |
| ×2 | 47uF | 47u | PSU outputs, drawn 47mf; read from the schematic by eye | |
| ×2 | .01uF | 10n | PSU bypass C21/C22, drawn .01; read from the schematic by eye | |
| ×1 | .47uF | 470n | C15 LFO integrator, drawn .47; read from the schematic by eye | |
| Diodes 3 | ||||
| ×4 | 1N4002 | 1N4002 | bridge rectifier D1-D4; read from the schematic by eye | |
| ×2 | 1N4742A | 1N4742A / 12V | zener references; read from the schematic by eye | |
| ×2 | 1N914 | 1N914 | LFO and lamp-driver diodes; read from the schematic by eye | |
| Transistors 3 | ||||
| Q2 | 2SC828 | 2SC828 | NPN regulator; read from the schematic by eye | |
| Q3 | 2SA666 | 2SA666 | PNP regulator; read from the schematic by eye | |
| Q4 | 2SC1452 | 2SC1452 | NPN lamp driver, or 2N4401; read from the schematic by eye | |
| ICs 1 | ||||
| ×6 | RC4558 | RC4558 | sections A1-A12, RC4558 or TI 4558; 6 dual chips assumed; read from the schematic by eye | |
| Opto 1 | ||||
| ×1 | PG53-650-6 | PG53-650-6 | lamp/photocell module, six photocells in the all-pass stages; read from the schematic by eye | |
| Potentiometers 3 | ||||
| Feedback | B10K | B10k | Potentiometer | drawn 10K linear #405; read from the schematic by eye |
| Rate | A25K | A25k | Potentiometer | drawn 25K log #406; read from the schematic by eye |
| Depth | B10K | B10k | Potentiometer | drawn 10K linear #405; read from the schematic by eye |
| Trimmers 2 | ||||
| TP1 | 10K | 10k | adjust for clipping point at bottom of waveform; read from the schematic by eye | |
| TP2 | 1K | 1k | adjust lamp current at maximum excursion; read from the schematic by eye | |
| Switches 1 | ||||
| S2 | SPST | SPST | mains power switch; read from the schematic by eye | |
| LEDs 1 | ||||
| ×1 | ? | ? | in series with 2200 across the supply, marked '#681'; pilot lamp/LED, part unclear; read from the schematic by eye | |
| Other 1 | ||||
| ×1 | 1A | 1A | mains fuse; read from the schematic by eye | |