ARP 1045 VOICE

The ARP 1045 ... consists of 4 boards:

  • A VCO Board as used in the1004-T/P and 1023 modules,
  • (2) ADSR Boards as used in the 1003 and 1046 and
  • A Filtamp Board (Transistor Ladder Low Pass VCF and VCA) as used int the 1005
  • SCHEMATIC - VCO Board - (click on image to download full-sized version)

    PARTS LIST - VCO 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.

    SCHEMATIC - Envelope Generator Board - (click on image to download full-sized version)

    PARTS LIST - Envelope Generator 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

    SCHEMATIC - Filtamp Board - (click on image to download full-sized version)

    PARTS LIST - Filtamp Board - see 1005 parts list.

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