Enclosure not stated · 7 knobs
DOD 908B
Based on the DOD 908B
- Category
- Delay· Delay Echo and Samplers
- Controls
- In Level · Out Level · Mix · Regeneration · Speed · Width · Delay Time
- Price
- see vendor
- Tags
- Delay Echo and Samplers
Schematic
The schematic is the archived file. Open it at Experimentalists Anonymous, or browse its folder.
Parts list 68 rows
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Check before you build · 5 values the reader of this schematic was not sure of
- 15uF: drawn 'N.P. 15uF', may be .15uF
- 2M: pencil-drawn resistor, possibly an added mod
- Out Level/Mix ganging read from dashed lines
- Mode: switch type inferred
- Counts of undesignated parts (10K x23, 1K x13, 47K x11) tallied by eye
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 17 | ||||
| ×1 | 100 | 100 | read from the schematic by eye | |
| ×13 | 1K | 1k | read from the schematic by eye | |
| ×2 | 2K | 2k | delay-time divider; read from the schematic by eye | |
| ×1 | 3.3K | 3.3k | read from the schematic by eye | |
| ×23 | 10K | 10k | read from the schematic by eye | |
| ×1 | 12K | 12k | LED meter ladder; read from the schematic by eye | |
| ×9 | 18K | 18k | bucket-brigade filter stages; read from the schematic by eye | |
| ×3 | 22K | 22k | read from the schematic by eye | |
| ×6 | 33K | 33k | read from the schematic by eye | |
| ×11 | 47K | 47k | read from the schematic by eye | |
| ×1 | 62K | 62k | read from the schematic by eye | |
| ×8 | 100K | 100k | read from the schematic by eye | |
| ×2 | 220K | 220k | read from the schematic by eye | |
| ×7 | 330 | 330 | LED current limiters and LED common; read from the schematic by eye | |
| ×1 | 470K | 470k | read from the schematic by eye | |
| ×3 | 1M | 1M | two drawn 1M, one 1MEG; read from the schematic by eye | |
| ×1 | 2M | 2M | drawn faintly in pencil at the U103 input; may be a later addition; read from the schematic by eye | |
| Capacitors 14 | ||||
| ×2 | 25pF | 25p | NE570 compander; read from the schematic by eye | |
| ×3 | 120pF | 120p | read from the schematic by eye | |
| ×1 | .0012uF | 1.2n | read from the schematic by eye | |
| ×2 | .0015uF | 1.5n | read from the schematic by eye | |
| ×6 | .0056uF | 5.6n | read from the schematic by eye | |
| ×3 | .01uF | 10n | read from the schematic by eye | |
| ×2 | .033uF | 33n | read from the schematic by eye | |
| ×1 | .1uF | 100n | read from the schematic by eye | |
| ×2 | .22uF | 220n | electrolytic; read from the schematic by eye | |
| ×4 | 1uF | 1u | electrolytic; read from the schematic by eye | |
| ×2 | 4.7uF | 4.7u | electrolytic; read from the schematic by eye | |
| ×8 | 10uF | 10u | electrolytic; read from the schematic by eye | |
| ×1 | 15uF | 15u | drawn 'N.P. 15uF', non-polar; could be .15uF; read from the schematic by eye | |
| ×3 | 470uF | 470u | electrolytic, supply filters; read from the schematic by eye | |
| Diodes 4 | ||||
| ×9 | 1N4148 | 1N4148 | read from the schematic by eye | |
| ×8 | 1N4001 | 1N4001 | two bridge rectifiers; read from the schematic by eye | |
| ×1 | 1N751A | 1N751A / 5V1 | zener; read from the schematic by eye | |
| ×1 | 1N754A | 1N754A / 6V8 | zener; read from the schematic by eye | |
| Transistors 10 | ||||
| T1 | 2N5089 | 2N5089 | read from the schematic by eye | |
| T2 | 2N5089 | 2N5089 | read from the schematic by eye | |
| T3 | 2N5089 | 2N5089 | read from the schematic by eye | |
| T4 | 2N5089 | 2N5089 | read from the schematic by eye | |
| T5 | J113 | J113 | JFET; read from the schematic by eye | |
| T6 | J111 | J111 | JFET; read from the schematic by eye | |
| T7 | 2N5089 | 2N5089 | read from the schematic by eye | |
| T8 | 2N5089 | 2N5089 | read from the schematic by eye | |
| T9 | 2N5089 | 2N5089 | read from the schematic by eye | |
| T10 | 2N5089 | 2N5089 | read from the schematic by eye | |
| ICs 11 | ||||
| U101 | RC4558 | RC4558 | read from the schematic by eye | |
| U102 | RC4558 | RC4558 | read from the schematic by eye | |
| U103 | LM324 | LM324 | read from the schematic by eye | |
| U104 | RC4558 | RC4558 | read from the schematic by eye | |
| U105 | RC4558 | RC4558 | read from the schematic by eye | |
| U106 | LM324 | LM324 | read from the schematic by eye | |
| U107 | LM324 | LM324 | LED level meter; read from the schematic by eye | |
| U108 | NE570 | NE570 | compander; read from the schematic by eye | |
| VR1 | 7805 | 7805 | +5V regulator; read from the schematic by eye | |
| VR2 | 7812 | 7812 | +12V regulator; read from the schematic by eye | |
| VR3 | 7912 | 7912 | -12V regulator; read from the schematic by eye | |
| Potentiometers 7 | ||||
| In Level | 100K | 100k | Potentiometer | read from the schematic by eye |
| Out Level | 100K | 100k | Potentiometer | dual-gang (dashed link to the mix-out section); read from the schematic by eye |
| Mix | 100K | 100k | Potentiometer | dual-gang; read from the schematic by eye |
| Regeneration | 1MEG | 1M | Potentiometer | read from the schematic by eye |
| Speed | 500K | 500k | Potentiometer | read from the schematic by eye |
| Width | 100K | 100k | Potentiometer | read from the schematic by eye |
| Delay Time | 100K | 100k | Potentiometer | read from the schematic by eye |
| Trimmers 1 | ||||
| Regen Trim | 5K | 5k | read from the schematic by eye | |
| Switches 3 | ||||
| In/Out | DPDT | DPDT | read from the schematic by eye | |
| Repeat | SPDT | SPDT | infinite repeat; read from the schematic by eye | |
| Mode | SP4T | SP4T | Flange/Chorus/Double/Echo selector, drawn as four linked contacts; exact switch type not given; read from the schematic by eye | |
| LEDs 1 | ||||
| ×10 | LED | LED | 4 level meter (+3/0/-5/-10 dB), in/out, repeat, 4 mode LEDs; no part number given; read from the schematic by eye | |