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)
|Resistors||1/4 watt, 10%, carbon composite|
|Tempco Resistors||1/4 watt, 3%, +3500ppm|
|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.
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