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dc Power
The amplifier may be operated from a battery power source. Ensure correct polarity
connection when connecting batteries. The amplifier requires a 24V dc source. Both dc and
ac power supplies can be used simultaneously. If an ac supply is present the amplifier will
automatically use this. Failure of the ac supply will cause the amplifier to switch to the dc
supply if present. The dc supply is unswitched, so an external switch will need to be fitted
to isolate this supply.
Facility Terminals
dc Output
The two left-hand terminals of the four terminals labelled FACILITY provide a 24V current
protected output, which can be used to supply external devices (such as relays or line pre-
amplifiers) to a maximum of 250mA (2A on the ADS5240 model)
Restoration
When a closure of any of the priority terminals is detected, the terminal marked 'Rest' will
conduct to ground (open collector). This can be used to drive volume restoration relays in
volume controls or to drive 'busy' lamps in multiple microphone systems.
Accessories
1 x Instruction Manual
1 x Mains Supply Lead
1 x 19-inch Rack Mounting Kit
Page 11 of 15
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