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: One, transformer coupled 600Ω balanced. J2, 25 pin “D” connector.
- 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.
Audio Control Unit Model ACU-101 Outline & Mounting
- ; 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.
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