Enclosure not stated · 4 knobs
Moog 921
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- Ring Mod / Synth· Oscillators LFOs and Signal Generators
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- see vendor
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- Oscillators LFOs and Signal Generators
Schematic
The schematic is the archived file. Open it at Experimentalists Anonymous, or browse its folder.
Parts list 176 rows
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Check before you build · 3 values the reader of this schematic was not sure of
- R336: reads 533K 1% (not a standard E96 value; could be 523K or 536K)
- IC7: drawn 'IC7' beside pin 7, probably IC507
- R509: 1K with a +3%/°C tempco, drawn '1K +3% TC'
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 105 | ||||
| R301 | 49.9K | 49.9k | 1/2W 5% unless noted; 1%; read from the schematic by eye | |
| R302 | 9.09K | 9.09k | 1%; read from the schematic by eye | |
| R303 | 22K | 22k | read from the schematic by eye | |
| R304 | 383K | 383k | 1%; read from the schematic by eye | |
| R305 | 76.8K | 76.8k | 1%; read from the schematic by eye | |
| R306 | 66.5K | 66.5k | 1%; read from the schematic by eye | |
| R307 | 100K | 100k | 1%; read from the schematic by eye | |
| R309 | 267K | 267k | 1%; read from the schematic by eye | |
| R310 | 66.5K | 66.5k | 1%; read from the schematic by eye | |
| R311 | 100K | 100k | 1%; read from the schematic by eye | |
| R312 | 100K | 100k | 1%; read from the schematic by eye | |
| R313 | 100K | 100k | 1%; read from the schematic by eye | |
| R314 | 33K | 33k | read from the schematic by eye | |
| R315 | 10K | 10k | read from the schematic by eye | |
| R316 | 330K | 330k | read from the schematic by eye | |
| R317 | 10K | 10k | read from the schematic by eye | |
| R318 | 10K | 10k | read from the schematic by eye | |
| R319 | 10K | 10k | read from the schematic by eye | |
| R320 | 10K | 10k | Q303 base resistor; R320 is also printed on the 2K clamp trimmer; read from the schematic by eye | |
| R321 | 200K | 200k | 1%; read from the schematic by eye | |
| R322 | 100K | 100k | 1%; read from the schematic by eye | |
| R323 | 100K | 100k | 1%; read from the schematic by eye | |
| R324 | 49.9K | 49.9k | 1%; IC304 feedback; R324 is printed twice; read from the schematic by eye | |
| R324 | 20K | 20k | second R324 on the drawing (IC304 + input to ground); read from the schematic by eye | |
| R325 | 100K | 100k | read from the schematic by eye | |
| R326 | 100K | 100k | read from the schematic by eye | |
| R327 | 100K | 100k | read from the schematic by eye | |
| R328 | 100K | 100k | read from the schematic by eye | |
| R329 | 10K | 10k | read from the schematic by eye | |
| R330 | 499K | 499k | 1%; read from the schematic by eye | |
| R331 | 499K | 499k | 1%; read from the schematic by eye | |
| R332 | 51K | 51k | read from the schematic by eye | |
| R333 | 100K | 100k | 1%; read from the schematic by eye | |
| R334 | 100K | 100k | 1%; read from the schematic by eye | |
| R335 | 100K | 100k | 1%; read from the schematic by eye | |
| R336 | 533K | 533k | 1%; read from the schematic by eye | |
| R337 | 100K | 100k | read from the schematic by eye | |
| R338 | 100K | 100k | 1%; read from the schematic by eye | |
| R339 | 51K | 51k | read from the schematic by eye | |
| R340 | 100K | 100k | 1%; read from the schematic by eye | |
| R506 | 47.5K | 47.5k | 1%; read from the schematic by eye | |
| R507 | 47.5K | 47.5k | 1%; read from the schematic by eye | |
| R509 | 1K | 1k | +3% tempco resistor (TC); read from the schematic by eye | |
| R510 | 1K | 1k | 1%; read from the schematic by eye | |
| R512 | 221Ω | 221 | 1%; read from the schematic by eye | |
| R513 | 1K | 1k | read from the schematic by eye | |
| R514 | 82K | 82k | read from the schematic by eye | |
| R515 | 18.7K | 18.7k | 1%; read from the schematic by eye | |
| R519 | 100K | 100k | 1%; read from the schematic by eye | |
| R524 | 27.4K | 27.4k | 1%; read from the schematic by eye | |
| R525 | 100K | 100k | 1%; read from the schematic by eye | |
| R542 | 27K | 27k | read from the schematic by eye | |
| R543 | 10K | 10k | read from the schematic by eye | |
| R544 | 470 | 470 | read from the schematic by eye | |
| R546 | 68.1K | 68.1k | 1%; read from the schematic by eye | |
| R547 | 47.5K | 47.5k | 1%; read from the schematic by eye | |
| R548 | 100K | 100k | read from the schematic by eye | |
| R550 | 220K | 220k | read from the schematic by eye | |
| R551 | 15K | 15k | read from the schematic by eye | |
| R552 | 220 | 220 | read from the schematic by eye | |
| R553 | 22K | 22k | read from the schematic by eye | |
| R554 | 33K | 33k | read from the schematic by eye | |
| R556 | 33K | 33k | read from the schematic by eye | |
| R557 | 33K | 33k | read from the schematic by eye | |
| R558 | 10K | 10k | read from the schematic by eye | |
| R559 | 4.53K | 4.53k | 1%; read from the schematic by eye | |
| R560 | 10.7K | 10.7k | 1%; read from the schematic by eye | |
| R561 | 180K | 180k | read from the schematic by eye | |
| R562 | 2.2K | 2.2k | read from the schematic by eye | |
| R563 | 10K | 10k | 1%; read from the schematic by eye | |
| R564 | 1.2K | 1.2k | read from the schematic by eye | |
| R566 | 2.4K | 2.4k | read from the schematic by eye | |
| R567 | 100K | 100k | read from the schematic by eye | |
| R568 | 75K | 75k | 1%; read from the schematic by eye | |
| R569 | 470K | 470k | read from the schematic by eye | |
| R571 | 470 | 470 | read from the schematic by eye | |
| R572 | 100K | 100k | read from the schematic by eye | |
| R573 | 10K | 10k | read from the schematic by eye | |
| R574 | 24K | 24k | read from the schematic by eye | |
| R579 | 1.5K | 1.5k | read from the schematic by eye | |
| R584 | 68K | 68k | read from the schematic by eye | |
| R586 | 8.2K | 8.2k | read from the schematic by eye | |
| R587 | 8.2K | 8.2k | read from the schematic by eye | |
| R588 | 470 | 470 | read from the schematic by eye | |
| R589 | 27K | 27k | read from the schematic by eye | |
| R590 | 680 | 680 | read from the schematic by eye | |
| R591 | 270K | 270k | read from the schematic by eye | |
| R593 | 18K | 18k | read from the schematic by eye | |
| R594 | 470 | 470 | read from the schematic by eye | |
| R595 | 18K | 18k | read from the schematic by eye | |
| R596 | 6.2K | 6.2k | read from the schematic by eye | |
| R597 | 2.2K | 2.2k | read from the schematic by eye | |
| R599 | 1.5K | 1.5k | read from the schematic by eye | |
| R600 | 499K | 499k | 1%; read from the schematic by eye | |
| R601 | 1MEG | 1M | read from the schematic by eye | |
| R602 | 20K | 20k | 1%; read from the schematic by eye | |
| R5 | 1K | 1k | front panel range ladder, matched set (note 2); read from the schematic by eye | |
| R6 | 1K | 1k | matched set; read from the schematic by eye | |
| R7 | 1K | 1k | matched set; read from the schematic by eye | |
| R8 | 1K | 1k | matched set; read from the schematic by eye | |
| R9 | 1K | 1k | matched set; read from the schematic by eye | |
| R10 | 1K | 1k | matched set; read from the schematic by eye | |
| R11 | 1.5K | 1.5k | front panel, sine output; read from the schematic by eye | |
| ×1 | 680 | 680 | no designator; Q501 emitter area; read from the schematic by eye | |
| ×1 | 150 | 150 | no designator; Q501 base area; read from the schematic by eye | |
| Capacitors 15 | ||||
| C302 | 0.1uF | 100n | read from the schematic by eye | |
| C303 | 0.1uF | 100n | read from the schematic by eye | |
| C501 | .01uF | 10n | read from the schematic by eye | |
| C502 | 100pF | 100p | read from the schematic by eye | |
| C503 | 27uF | 27u | electrolytic; read from the schematic by eye | |
| C504 | 1.0uF | 1u | read from the schematic by eye | |
| C505 | .033uF | 33n | read from the schematic by eye | |
| C506 | .005uF | 5n | read from the schematic by eye | |
| C509 | 10uF | 10u | electrolytic, supply; read from the schematic by eye | |
| C510 | 10uF | 10u | electrolytic, supply; read from the schematic by eye | |
| C511 | .001uF | 1n | read from the schematic by eye | |
| C512 | .005uF | 5n | read from the schematic by eye | |
| C513 | .0022uF | 2.2n | read from the schematic by eye | |
| C515 | 500pF | 500p | C515 is printed twice; read from the schematic by eye | |
| C515 | .47uF | 470n | second C515 on the drawing (bottom of the 91-125 board); read from the schematic by eye | |
| Diodes 7 | ||||
| CR301 | 1N4148 | 1N4148 | read from the schematic by eye | |
| CR302 | 1N4148 | 1N4148 | read from the schematic by eye | |
| CR303 | 1N4148 | 1N4148 | read from the schematic by eye | |
| CR501 | 1N4148 | 1N4148 | read from the schematic by eye | |
| CR502 | 1N4148 | 1N4148 | read from the schematic by eye | |
| CR503 | 1N4148 | 1N4148 | read from the schematic by eye | |
| CR504 | 1N4148 | 1N4148 | read from the schematic by eye | |
| Transistors 14 | ||||
| Q301 | 2N3904 | 2N3904 | read from the schematic by eye | |
| Q302 | 2N3904 | 2N3904 | read from the schematic by eye | |
| Q303 | 2N3906 | 2N3906 | read from the schematic by eye | |
| Q304 | 2N3904 | 2N3904 | read from the schematic by eye | |
| Q305 | 2N3906 | 2N3906 | read from the schematic by eye | |
| Q307 | 2N3906 | 2N3906 | read from the schematic by eye | |
| Q501 | 2N4402 | 2N4402 | read from the schematic by eye | |
| Q504 | 2N3904 | 2N3904 | read from the schematic by eye | |
| Q505 | E400 | E400 | dual N-channel JFET; read from the schematic by eye | |
| Q506 | 2N3904 | 2N3904 | read from the schematic by eye | |
| Q507 | 2N3904 | 2N3904 | read from the schematic by eye | |
| Q508 | 2N3904 | 2N3904 | read from the schematic by eye | |
| Q509 | 2N3904 | 2N3904 | read from the schematic by eye | |
| Q514 | E112 | E112 | N-channel JFET; read from the schematic by eye | |
| ICs 15 | ||||
| IC301 | 741A | 741A | read from the schematic by eye | |
| IC302 | 741 | 741 | read from the schematic by eye | |
| IC303 | 741 | 741 | read from the schematic by eye | |
| IC304 | 741 | 741 | read from the schematic by eye | |
| IC305 | 741 | 741 | read from the schematic by eye | |
| IC306 | 741 | 741 | read from the schematic by eye | |
| IC307 | 741 | 741 | read from the schematic by eye | |
| IC502 | 741 | 741 | read from the schematic by eye | |
| IC504 | 741 | 741 | read from the schematic by eye | |
| IC506 | 741 | 741 | read from the schematic by eye | |
| IC7 | 3080 | 3080 | OTA (CA3080); drawn 'IC7', probably IC507; read from the schematic by eye | |
| IC508 | SG3821 | SG3821 | transistor array; read from the schematic by eye | |
| IC509 | SG3821 | SG3821 | transistor array; read from the schematic by eye | |
| IC510 | 748 | 748 | read from the schematic by eye | |
| IC511 | 741 | 741 | read from the schematic by eye | |
| Potentiometers 4 | ||||
| Aux Out Level | A50K | A50k | Potentiometer | R1, drawn 50K AUD; read from the schematic by eye |
| Freq | 5K | 5k | Potentiometer | R2; read from the schematic by eye |
| Width | B25K | B25k | Potentiometer | R3, 25K LIN; read from the schematic by eye |
| Clamp | B2.5K | B2.5k | Potentiometer | R4, 2.5K LIN; read from the schematic by eye |
| Trimmers 12 | ||||
| R308 | 1K | 1k | cermet; read from the schematic by eye | |
| R320 | 2K | 2k | clamp trim; R320 also printed on a 10K resistor; read from the schematic by eye | |
| R511 | 100Ω | 100 | scale trim; read from the schematic by eye | |
| R545 | 1K | 1k | hi adj; read from the schematic by eye | |
| R549 | 100K | 100k | bottom end; read from the schematic by eye | |
| R555 | 10K | 10k | top end; read from the schematic by eye | |
| R565 | 1K | 1k | tri offset; read from the schematic by eye | |
| R570 | 100K | 100k | rect width; read from the schematic by eye | |
| R585 | ? | ? | sine shape; no value printed; read from the schematic by eye | |
| R592 | 200K | 200k | sine sym; read from the schematic by eye | |
| R598 | 1K | 1k | sine offset; read from the schematic by eye | |
| ×1 | 2K | 2k | no designator; top of the range resistor ladder, to +12V; read from the schematic by eye | |
| Switches 4 | ||||
| SW1 | SP6T | SP6T | range: 32', 16', 8', 4', 2', 1'; read from the schematic by eye | |
| SW2 | SP5T | SP5T | aux out waveform; read from the schematic by eye | |
| SW3 | SPST | SPST | scale; read from the schematic by eye | |
| SW4 | 3PDT | 3PDT | coarse range, sub audio / audio; read from the schematic by eye | |