MODEL 2820A & 2825A Two Diver Communicator—User Manual

CONTROLS & CONNECTIONS
OTHER CONNECTIONS 5.6
EXTERNAL BATTERY - (Input) - External 12 VDC power input, to operate the unit from
an external battery or power source. Power requirements are 12 volts DC (nominal), not
less than 9.5 or more than 18 volts. Source must be able to supply a peak current of three
amps for proper operation. With the model /23 Option these jacks are used for charging the
internal batteries.
It is highly recommended to use an Amron External Charger, Model 2823-602 as external
power supply. The Amron External Charger was specifically designed for use with all
Amron communicators and has a high degree of insulation between the primary and
secondary circuits for diver protection and safety.
WARNING: When using an external power source, it is required to use an insulated DC
power supply that has very low ripple voltage. It has to be properly insulated from AC line
for diver protection and safety. An improperly insulated power supply could cause diver
electric shock.
TAPE RECORDER – provides an isolated output, of both diver and tender conversations
(balanced), suitable to drive a tape recorder or audio input of a VCR. This feature allows
recording of conversations between diver and tender.
AC POWER – AC power cord is mounted in the option panel located on right side of the
communicator front panel. The option panel has an AC power indicator to identify the
presence of AC power.
Communicator operates with both 110V and 220V (50 or 60 Hz). There is an internal
power supply card that detects the supplied AC voltage either 100V or 220V and
automatically switches the internal relays to the proper voltage. There is no manual switch
to select the supplied voltage as it switches automatically inside the power supply. Also this
internal power supply regulates the voltage to 14 VDC to supply the amplifier card and
charges the internal batteries at the same time.
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