ARP 4001 Exponential Sub-Module
The 4001 was an encapsulated NPN-based exponential current generator (current source).
SCHEMATIC
- (click on image to download full-sized version)
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ARP 4001 Exponential Sub-Module The 4001 was an encapsulated NPN-based exponential current generator (current source). SCHEMATIC - (click on image to download full-sized version)
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PARTS LIST
| Resistors | 1/4 watt, 10%, carbon composite |
| 10 K | R4 |
| 15 K | R5 |
| 1.5 Meg | R2 |
| 2.2 Meg | R3 |
| Tempco Resistors | 1/4 watt, 3%, +3500ppm |
| 100 Ohm | R1 |
| Diodes | |
| 1N4148 | CR1, CR2 |
| Transistors | |
| TZ-81 * | Q3 |
| TZ-581 ** | Q4, Q5 |
| TZ-81 | Q1, Q2 (matched pair) |
* - TZ-81 alternate part was the 2N5249, also defunct. 2N3904 would be a modern equivalent.
** - TZ-581 alternate part was the 2N5367, also defunct. 2N3906 would be a modern equivalent.