Enclosure not stated · 6 knobs
EFM Keyboard Interface
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- Ring Mod / Synth· Full Synths Drum Synths and Misc Synth
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- Full Synths Drum Synths and Misc Synth
Schematic
The schematic is the archived file. Open it at Experimentalists Anonymous, or browse its folder.
Parts list 59 rows
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Check before you build · 7 values the reader of this schematic was not sure of
- Width: drawing 1M vs parts list 50K
- T1: drawing 50K vs parts list 10K
- R19: drawing 1K vs parts list 470
- C8: page 6 .01uF vs parts list and page 7 1.0uF
- R11: only in the parts list
- R16: drawn as a second 'R15'
- U3: two op-amp/OTA sections labelled U3; the comparator near D2 is probably a section of another TL072
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 29 | ||||
| R1 | 10K | 10k | read from the schematic by eye | |
| R2 | 10K | 10k | read from the schematic by eye | |
| R3 | 100K | 100k | read from the schematic by eye | |
| R4 | 10K | 10k | read from the schematic by eye | |
| R5 | 100K | 100k | read from the schematic by eye | |
| R6 | 10K | 10k | read from the schematic by eye | |
| R7 | 100 | 100 | read from the schematic by eye | |
| R8 | 10K | 10k | read from the schematic by eye | |
| R9 | 10K | 10k | read from the schematic by eye | |
| R10 | 33K | 33k | on the drawing; not in the printed parts list; read from the schematic by eye | |
| R11 | 47K | 47k | in the printed parts list only; not found on the drawing; read from the schematic by eye | |
| R12 | 100K | 100k | read from the schematic by eye | |
| R13 | 22K | 22k | read from the schematic by eye | |
| R14 | 100K | 100k | read from the schematic by eye | |
| R15 | 390K | 390k | value from the parts list; drawn as a jumper position ('Jump R15') for the Width option; read from the schematic by eye | |
| R16 | 10K | 10k | drawn labelled 'R15 10K' between the two U4 stages; parts list gives R16 10K; read from the schematic by eye | |
| R17 | 390K | 390k | value from the parts list; drawn as a jumper position ('Jump R17'); read from the schematic by eye | |
| R18 | 33K | 33k | read from the schematic by eye | |
| R19 | 1K | 1k | parts list says 470; read from the schematic by eye | |
| R20 | 2K2 | 2.2k | read from the schematic by eye | |
| R21 | 10K | 10k | read from the schematic by eye | |
| R22 | 10K | 10k | read from the schematic by eye | |
| R23 | 2K2 | 2.2k | read from the schematic by eye | |
| R24 | 10K | 10k | read from the schematic by eye | |
| R25 | 22K | 22k | read from the schematic by eye | |
| R26 | 220 | 220 | read from the schematic by eye | |
| R27 | 33K | 33k | read from the schematic by eye | |
| R28 | 10K | 10k | read from the schematic by eye | |
| R-chain | 100 | 100 | on the keyboard: 100 ohm 1% resistors, one per key minus one (47 for a 48-key keyboard); read from the schematic by eye | |
| Capacitors 9 | ||||
| C1 | 0.1uF | 100n | read from the schematic by eye | |
| C2 | 0.1uF | 100n | read from the schematic by eye | |
| C3 | .001uF | 1n | read from the schematic by eye | |
| C4 | .01 | 10m | read from the schematic by eye | |
| C5 | .01uF | 10n | read from the schematic by eye | |
| C6 | .01uF | 10n | read from the schematic by eye | |
| C7 | 33pF | 33p | read from the schematic by eye | |
| C8 | .01uF | 10n | parts list and the expander page give 1.0uF; read from the schematic by eye | |
| C9 | 0.1uF | 100n | read from the schematic by eye | |
| Diodes 5 | ||||
| D1 | 1N914 | 1N914 | read from the schematic by eye | |
| D2 | 1N914 | 1N914 | read from the schematic by eye | |
| D3 | 1N914 | 1N914 | read from the schematic by eye | |
| ×1 | Diode | DIODE | at U4 pin 7 square output; no designator or part number given; read from the schematic by eye | |
| ×2 | 1N4148 | 1N4148 | Width option, marked * (optional), across P2; read from the schematic by eye | |
| Transistors 3 | ||||
| Q1 | 2N3819 | 2N3819 | or J112; read from the schematic by eye | |
| Q2 | 2N3904 | 2N3904 | read from the schematic by eye | |
| Q3 | 2N3906 | 2N3906 | read from the schematic by eye | |
| ICs 4 | ||||
| U1 | TL072 | TL072 | read from the schematic by eye | |
| U2 | TL072 | TL072 | read from the schematic by eye | |
| U3 | LM13600 | LM13600 | VCA; the drawing also labels the gate comparator op amp near D2 'U3'; read from the schematic by eye | |
| U4 | TL072 | TL072 | read from the schematic by eye | |
| Potentiometers 6 | ||||
| Glide | 1M | 1M | Potentiometer | P1; read from the schematic by eye |
| Width | 1M | 1M | Potentiometer | P2; parts list says 50K; read from the schematic by eye |
| Rate | 100K | 100k | Potentiometer | P3; read from the schematic by eye |
| VCA Init | 50K | 50k | Potentiometer | P4; read from the schematic by eye |
| Mod Range | 50K | 50k | Potentiometer | P5; read from the schematic by eye |
| P. Bend Range | 50K | 50k | Potentiometer | P6; read from the schematic by eye |
| Trimmers 1 | ||||
| T1 | 50K | 50k | parts list says 10K; read from the schematic by eye | |
| Switches 1 | ||||
| S1 | SPST | SPST | Gate Disable; read from the schematic by eye | |
| Other 1 | ||||
| ×1 | ? | ? | two-axis joystick (two pots), value not given; read from the schematic by eye | |