Enclosure not stated · 2 knobs
Moog 904C
- Category
- Other· Filters Wahs and VCFs
- Controls
- Center Frequency · Bandwidth
- Price
- see vendor
- Tags
- Filters Wahs and VCFs
Schematic
The schematic is the archived file. Open it at Experimentalists Anonymous, or browse its folder.
Parts list 20 rows
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Check before you build · 1 value the reader of this schematic was not sure of
- Coupler Switch: upper (A/B) and lower (C/D/E) decks assumed to be one ganged switch; pole count inferred from the wafer contacts
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 11 | ||||
| ×3 | 10K | 10k | two in series from switch B to the buffer input, one feedback from output; read from the schematic by eye | |
| ×1 | 68K | 68k | buffer bias; read from the schematic by eye | |
| ×2 | 680 | 680 | one buffer collector, one to -6 at the PNP pair; read from the schematic by eye | |
| ×1 | 33 | 33 | +12 supply dropper; read from the schematic by eye | |
| ×1 | 100 | 100 | buffer emitter; read from the schematic by eye | |
| ×10 | 100K | 100k | control summing network; read from the schematic by eye | |
| ×2 | 51K | 51k | control summing network (D deck); read from the schematic by eye | |
| ×2 | 15K | 15k | differential pair loads; read from the schematic by eye | |
| ×1 | 330 | 330 | PNP pair emitters; read from the schematic by eye | |
| ×1 | 68 | 68 | in series with .005 between pair collectors; read from the schematic by eye | |
| ×1 | 5.6K | 5.6k | NPN pair tail to -6; read from the schematic by eye | |
| Capacitors 4 | ||||
| ×1 | .01uF | 10n | read from the schematic by eye | |
| ×1 | 80uF | 80u | electrolytic, supply filter; read from the schematic by eye | |
| ×2 | 10uF | 10u | electrolytic, buffer input and output coupling; read from the schematic by eye | |
| ×1 | .005uF | 5n | read from the schematic by eye | |
| Transistors 2 | ||||
| ×3 | 2N2926 | 2N2926 | NPN (or TI416): buffer transistor and the lower differential pair; read from the schematic by eye | |
| ×2 | 2N3702 | 2N3702 | PNP: upper differential pair; read from the schematic by eye | |
| Potentiometers 2 | ||||
| Center Frequency | 5K | 5k | Potentiometer | read from the schematic by eye |
| Bandwidth | 5K | 5k | Potentiometer | read from the schematic by eye |
| Switches 1 | ||||
| Coupler Switch | 9P3T | 9P3T | 3-position front-panel rotary, decks A-E (A, B, C, D two poles each, E one); series / LP-HP / parallel; read from the schematic by eye | |