Enclosure not stated · 1 knob
Univox Microphaser
Based on the Univox Microphaser
Schematic
The schematic is the archived file. Open it at Experimentalists Anonymous, or browse its folder.
Parts list 49 rows
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Check before you build · 2 values the reader of this schematic was not sure of
- D1: drawing labels it both '1S 390' and 'ZPD 4V7'; used the parts note
- S1: pole count assumed from the single-pole symbol
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 31 | ||||
| R1 | 220k | 220k | read from the schematic by eye | |
| R2 | 220k | 220k | read from the schematic by eye | |
| R3 | 470k | 470k | read from the schematic by eye | |
| R4 | 100k | 100k | read from the schematic by eye | |
| R5 | 100k | 100k | read from the schematic by eye | |
| R6 | 100k | 100k | read from the schematic by eye | |
| R7 | 100k | 100k | read from the schematic by eye | |
| R8 | 100k | 100k | read from the schematic by eye | |
| R9 | 100k | 100k | read from the schematic by eye | |
| R10 | 100k | 100k | read from the schematic by eye | |
| R11 | 100k | 100k | read from the schematic by eye | |
| R12 | 100k | 100k | read from the schematic by eye | |
| R13 | 100k | 100k | read from the schematic by eye | |
| R14 | 100k | 100k | read from the schematic by eye | |
| R15 | 100k | 100k | read from the schematic by eye | |
| R16 | 100k | 100k | read from the schematic by eye | |
| R17 | 2k2 | 2.2k | read from the schematic by eye | |
| R18 | 1k | 1k | read from the schematic by eye | |
| R19 | 100k | 100k | read from the schematic by eye | |
| R20 | 22k | 22k | read from the schematic by eye | |
| R21 | 22k | 22k | read from the schematic by eye | |
| R22 | 47k | 47k | read from the schematic by eye | |
| R23 | 2k7 | 2.7k | read from the schematic by eye | |
| R24 | 2k7 | 2.7k | traced from a similar 1976 unit (dotted lines); read from the schematic by eye | |
| R25 | 3k3 | 3.3k | traced from a similar 1976 unit (dotted lines); read from the schematic by eye | |
| R26 | 47k | 47k | read from the schematic by eye | |
| R27 | 33k | 33k | traced from a similar 1976 unit (dotted lines); read from the schematic by eye | |
| R28 | 220k | 220k | read from the schematic by eye | |
| R29 | 27k | 27k | read from the schematic by eye | |
| R30 | 470k | 470k | read from the schematic by eye | |
| R31 | 1M | 1M | read from the schematic by eye | |
| Capacitors 9 | ||||
| C1 | 50n | 50n | read from the schematic by eye | |
| C2 | 50n | 50n | read from the schematic by eye | |
| C3 | 50n | 50n | read from the schematic by eye | |
| C4 | 50n | 50n | read from the schematic by eye | |
| C5 | 50n | 50n | read from the schematic by eye | |
| C6 | 1uF | 1u | electrolytic; read from the schematic by eye | |
| C7 | 33uF | 33u | electrolytic; read from the schematic by eye | |
| C8 | 10uF | 10u | electrolytic; read from the schematic by eye | |
| C9 | 4.7uF | 4.7u | tantalum, drawn 4µ7 Ta; read from the schematic by eye | |
| Diodes 1 | ||||
| D1 | ZPD 4V7 | ZPD 4V7 | 4.7V zener per the parts note; '1S 390' is also printed beside the symbol; read from the schematic by eye | |
| Transistors 4 | ||||
| Q1 | 2SK34D | 2SK34D | N-JFET; or 2SK30A, BF244A, selected; read from the schematic by eye | |
| Q2 | 2SK34D | 2SK34D | N-JFET; or 2SK30A, BF244A, selected; read from the schematic by eye | |
| Q3 | 2SK34D | 2SK34D | N-JFET; or 2SK30A, BF244A, selected; read from the schematic by eye | |
| Q4 | 2SK34D | 2SK34D | N-JFET; or 2SK30A, BF244A, selected; read from the schematic by eye | |
| ICs 1 | ||||
| ×3 | 1458 | 1458 | dual op amp; sections OP1-OP6 (no chip designators drawn); read from the schematic by eye | |
| Potentiometers 1 | ||||
| Rate | A1M | A1M | Potentiometer | P1, 1M log; read from the schematic by eye |
| Trimmers 1 | ||||
| Bias | 100k | 100k | TP1; read from the schematic by eye | |
| Switches 1 | ||||
| S1 | SPST | SPST | effect on/off switch in the output, drawn as a single-pole switch; read from the schematic by eye | |