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Audio Control Unit Model ACU-101

Audio Control Unit Model ACU-101

The Audio Control Unit is designed to combine audio signals from four input sources into a single mixed audio output signal. The audio output and all four audio inputs are coupled to the ACU-101’s internal circuitry through 600Ω balanced transformers. Each of the four inputs have independent level controls located on the front panel. These controls allow volume adjustment of any particular input from OFF to a comfortable listening level. The ACU-101 has a gray, back lit front panel and is housed in a chassis that will fit in a standard Dzus slot. A 25-pin “D” connector is provided for the audio output and all four audio inputs. A D38999 series III connector is provided for connection to the power source. The power switch, located on the front panel, is a locking toggle switch. The locking toggle switch is provided to reduce the possibility of inadvertently turning the ACU power ON or OFF. A green power indicator is illuminated when the power switch is in the ON position.

  • Inputs: Four, transformer coupled 600Ω balanced. J2, 25 pin “D” connector.
  • Volume controls: Four located on the front panel, one control for each input.

  • Output
  • Output: One, transformer coupled 600Ω balanced. J2, 25 pin “D” connector.

  • Primary Power
  • Primary Power: 28 ± 6 VDC, isolated from signal ground and chassis ground, J1 M38999 Series III connector.

  • Frequency Response: Flat, ±2 dB from 85 Hz to 20 kHz.
  • Gain: Adjustable from –60 dB to +6 dB.
  • Front Panel: Gray, back lit with power switch and green power indicator.
  • Operating Temperature Range
  • Full Performance: 0 °C to +55 °C
  • Degraded Performance: -25°C to -1 °C
  • Non-Operating Temperature: -40 °C to +71 °C
  • Shock: 10 g’s for 11mS.
  • Vibration: Double amplitude, sinusoidal excitation of 0.1 inches from 5 Hz to 20 Hz, and ±2 g’s between 20 Hz and 500 Hz.
  • Cooling: Conduction, through chassis.
  • Weight: 1.5 lb. Max.
  • ; Size: Depth 7.200” Max, Width 5.750” Max, Height 1.500” Max.
  • Mounting: 2 each Dzus fasteners.
  • Power Consumption: Nominal 2.25 watts, 3.5 watts Max. Not including illuminated panel.
  • Power Switch: Locking Toggle Switch.
  • ; J1: D38999/20-W-A-98-P-N
    Pin A 28 VDC
    Pin B 28 VDC RTN
    Pin C Chassis

  • J2: M24308/4-3, 25 Pin “D”
    Pin 1 Channel 1 + Input
    Pin 2 Channel 1 – Input
    Pin 3 Channel 1 Center Tap
    Pin 4 Channel 2 + Input
    Pin 5 Channel 2 – Input
    Pin 6 Channel 2 Center Tap
    Pin 7 Channel 3 + Input
    Pin 8 Channel 3 – Input
    Pin 9 Channel 3 Center Tap
    Pin 10 Channel 4 + Input
    Pin 11 Channel 4 – Input
    Pin 12 Channel 4 Center Tap
    Pin 13 + Output
    Pin 14 – Output
    Pin 15 Output Center Tap
    Pin 16 No Connection
    Pin 17 No Connection
    Pin 18 No Connection
    Pin 19 No Connection
    Pin 20 Signal Ground
    Pin 21 Signal Ground
    Pin 22 Signal Ground
    Pin 23 Chassis
    Pin 24 Back lighting
    Pin 25 Back lighting return / Chassis.

Audio Control Unit Model ACU-101 Outline & Mounting
Front View
Audio Control Unit Model ACU-101 Front View
Rear View
Audio Control Unit Model ACU-101 Rear View
Top View
Audio Control Unit Model ACU-101 Top View

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