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Oberheim PS-1
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- Phaser· Phasers
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- Phasers
Schematic
The schematic is the archived file. Open it at Experimentalists Anonymous, or browse its folder.
Parts list 27 rows
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Check before you build · 1 value the reader of this schematic was not sure of
- Off/Slow Phase: switch type not drawn clearly (shown as a simple toggle to ground), SPST assumed
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 9 | ||||
| ×2 | 270 | 270 | undesignated; +15 and -15 supply droppers; read from the schematic by eye | |
| ×12 | 10K | 10k | undesignated; input, LFO, bias network; read from the schematic by eye | |
| ×4 | 33K | 33k | undesignated; read from the schematic by eye | |
| ×6 | 47K | 47k | undesignated; four in the output mix and JFET switching, two in the LFO; read from the schematic by eye | |
| ×18 | 100k | 100k | undesignated; three per all-pass stage, six stages; read from the schematic by eye | |
| ×3 | 100K | 100k | undesignated; switch drivers and medium-phase rate; read from the schematic by eye | |
| ×2 | 150K | 150k | undesignated; LFO; read from the schematic by eye | |
| ×1 | 220K | 220k | undesignated; LFO; read from the schematic by eye | |
| ×6 | 1M | 1M | undesignated; JFET gates, LFO bias, DC offset feed; read from the schematic by eye | |
| Capacitors 5 | ||||
| ×6 | 0.01uF | 10n | undesignated; one per all-pass stage; read from the schematic by eye | |
| ×2 | 0.33uF | 330n | undesignated; input coupling and LFO integrator; read from the schematic by eye | |
| ×1 | 47uF | 47u | undesignated; FET bias filter; read from the schematic by eye | |
| ×1 | 220uF | 220u | undesignated; LFO; read from the schematic by eye | |
| ×2 | 470uF | 470u | undesignated; 25V supply filters; read from the schematic by eye | |
| Diodes 2 | ||||
| ×4 | 1N4002 | 1N4002 | bridge rectifier; read from the schematic by eye | |
| ×2 | 1N965 | 1N965 / 15V | zener, 15V supply regulation; read from the schematic by eye | |
| Transistors 4 | ||||
| ×4 | 2N3638A | 2N3638A | PNP; legend: all bipolars 2N3638A; read from the schematic by eye | |
| ×3 | 2N4302 | 2N4302 | N-channel JFET; two output switches, one in LFO; read from the schematic by eye | |
| ×1 | P1069C | P1069C | JFET in LFO; read from the schematic by eye | |
| ×6 | ? | ? | N-channel JFETs of the all-pass stages, marked selected; no part number given; read from the schematic by eye | |
| ICs 1 | ||||
| ×4 | 1458 | 1458 | dual op amp; legend: all ICs 1458; three for the six phase stages, one for the LFO; read from the schematic by eye | |
| Trimmers 3 | ||||
| DC Offset | 10K | 10k | read from the schematic by eye | |
| Osc. Ampl. | 10K | 10k | read from the schematic by eye | |
| FET Bias | 10K | 10k | read from the schematic by eye | |
| Switches 3 | ||||
| Off/Slow Phase | SPST | SPST | bypass/phase switch named in the adjustment procedure; read from the schematic by eye | |
| Medium Phase | SPST | SPST | LFO rate select; read from the schematic by eye | |
| Fast Phase | SPST | SPST | LFO rate select; read from the schematic by eye | |