ARP 1003 DUAL ENVELOPE GENERATOR

The ARP 1003 consisted of 2 identical ADSR boards.

SCHEMATIC - ADSR Board - UNDER CONSTRUCTION! - (click on image to download full-sized version)

PARTS LIST - ADSR BOARD - UNDER CONSTRUCTION!

Resistors1/4 watt, 10%, carbon composite
Trim PotsLinear Taper
Capacitors20%, 35 volt, tantalum
Capacitors20%, 50 volt, ceramic disc
Capacitors20%, 50 volt, polycarbonate
Diodes
1N4148CR1 thru CR9
PotentiometersLinear Taper
10 KR7, R26
Transistors
A2803-004-A *Q1 - Noise Select
TZ81 **Q2, Q3, Q5
2N5172Q4, Q6
Integrated Circuits
LM301AHZ1, 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.

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