ARP 4005 VCA Sub-Modules
The 4005-1P, 2N and 3P were encapsulated differential input variable gain sub-modules (A.K.A. VCA).
4005-1P
Parts Placement and SCHEMATIC - (click on image to download full-sized version)
PCB - actual size
Used for all 3
PARTS LIST
| Transistors | |
| TZ-81 * | Q3 |
| TZ-581 ** | Q4, Q5 |
| TZ-81 | Q1, Q2 (matched pair) |
4005-2N
Parts Placement and SCHEMATIC - (click on image to download full-sized version)
PCB - actual size
Used for all 3
PARTS LIST
| Tempco Resistors | 1/4 watt, 3%, +3500ppm |
| 100 Ohm | R1 |
| Transistors | |
| TZ-81 * | Q3 |
| TZ-581 ** | Q4, Q5 |
| TZ-81 | Q1, Q2 (matched pair) |
4005-3P
Parts Placement and SCHEMATIC - (click on image to download full-sized version)
PCB - actual size
Used for all 3