Icom IC-751A Instruction Manual page 20

4 - 4 MICROPHONE
4-5 CW KEY
Wiring for a straight key.
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4 - 6 POWER SUPPL Y
•AC OPERATION WITH THE IC-PS30
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IC-751A
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The supplied
HM-36
electret condenser hand microphone or
optional SM-8 or SM-10 desk microphone may be used. Merely plug
it into the MICROPHONE CONNECTOR on the front panel. If you
wish to use a different microphone, make certain it has the proper
output level. Particular care must be exercised when wiring a
different microphone since the transceiver internai electrical switch-
ing system is dependent upon the correct connections. See
SECTION 3 - 1 FRONT PANEL Item
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for MIC CONNECTOR
connections.
HM-36 Schematic Diagram
MIC
ELEMENT
R1: 2k.n
R2: 470.n
C1: 4700pF
C2: 4700pF
C3: 10µF
C4: 0.33µF
For CW operation, connecta CW key to the KEY JACK using the
supplied standard 1 /4 inch, 3-conductor plug. See the diagrams for
connection details.
Note that the keyed voltage when switching with semiconductors or
relays with resistors in the circuit must be less that 0.4 volts.
Wiring for an iambic paddle.
When an AC power supply is required, the IC-PS35 internai power
supply, or the IC-PS30 or IC-PS15 external power supply with
matching size and style is recommended.
CAUTION: Voltages greater than 15 volts OC may damage this
transceiver. Check the source voltage before con-
necting the power cable when using with non-lCOM
AC power supplies.
IC-PS30
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EXTRA 13.SV DC OUTPUTS
-16-
AC OUTLET
187
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