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ARP 1023 DUAL OSCILLATOR The ARP 1023 Dual Voltage Controlled Oscillator was essentially 2 1004 oscillator boards. It had a rotary panel switch to select the output waveform instead of the "T" or "P" boards as used in the 1004-T/P modules. SCHEMATIC - (click on image to download full-sized version)
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PARTS LIST - UNDER CONSTRUCTION!
| Resistors | 1/4 watt, 10%, carbon composite |
| Trim Pots | Linear Taper |
| Capacitors | 20%, 35 volt, tantalum |
| Capacitors | 20%, 50 volt, ceramic disc |
| Capacitors | 20%, 50 volt, polycarbonate |
| Diodes | |
| 1N4148 | CR1 thru CR9 |
| Potentiometers | Linear Taper |
| 10 K | R7, R26 |
| Transistors | |
| A2803-004-A * | Q1 - Noise Select |
| TZ81 ** | Q2, Q3, Q5 |
| 2N5172 | Q4, Q6 |
| Integrated Circuits | |
| LM301AH | Z1, Z2, Z3 |
* - an ARP part number, most likely a 2N5172. Not all 2N5172's are good as a noise source, so these would have been tested and selected.
** - TZ-81 alternate part was the 2N5249, also defunct. 2N3904 would be a modern equivalent. Also a 2N3906 would be the modern substitute for the TZ-581 (alternate 2N5367) that ARP used as the PNP complement to the TZ-81.
