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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a circuit diagram showing a conventional
example. FIG. 2 is a circuit diagram showing an embodiment of the present invention. 1 ·····
Microphone unit, 2, 3 · · · · · · · · · · · · · · · · · · · · · · common earth, 5 · · · cadmium sulfide element, 6 · ·
· · · · · element.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a microphone
transmit / receive switching circuit. FIG. 1 shows a conventional microphone transmission /
reception switching circuit. At the time of reception in FIG. The switch 5 company reception 11H
is disconnected from the input circuit of the microphone, and the ground line 11 of the speaker
is connected to the common ground of the set main body to form a reception circuit. At the time
of transmission, the switch shown in FIG. The switch 3 is in the transmission state, and the input
circuit of the 7 '. Line 1 ° through all through OB) The ground line 1 ° of the speaker
connected to the microphone amplifier (not shown) of the transceiver is disconnected and the
power supply line of the receiving circuit Are grounded, the receiver circuitry is disabled, and the
transmitter circuitry is formed. The switch 3 and the switch of 2 circuits are needed, and the
switch of 2 circuits may not be able to be used locally. The object of the present invention is to
eliminate the above-mentioned drawbacks of the prior art and to switch the transmission and
reception into one circuit. In the present invention, a switch for transmitting and receiving is
formed into one circuit, and a current flowing through the switching circuit causes a light
emitting element such as a light emitting diode or a lamp to emit light, and this light is received.
The element (ods 3 is used for the signal circuit of all three tube crophones to turn the signal
circuit of the microphone 0 N-OFF. FIG. 2, which will be described with reference to all the
drawings of the present invention, is a microphone transmission / reception switching circuit of
the present invention. In the present invention, the cadmium sulfide element 5 is incorporated in
the signal circuit of the microphone, and one of the light emitting elements (for example, tfLItD)
6 is incorporated in the B power source switching circuit of the receiving circuit. In the receiving
state, the light emitting element 6 does not emit light, so that the cadmium sulfide element 5 has
a high resistance value close to 1 MΩ, and the signal circuit of the microphone is OFF with
respect to the microphone amplifier (not shown). On the other hand, when the switch 3P is
switched to the transmission state, the light emitting element 6Vc current flows to emit light, the
cadmium sulfide element 5 receives light, and the resistance value becomes several hundreds Ω,
and the signal circuit of the microphone is connected to the microphone amplifier. The audio
from can be input to the microphone amplifier and can be transmitted. If two switches are used
in the transmission / reception switching circuit as in the prior art? 0N10 If IPF does not take
timing t, OB) The lanshiper oscillates abnormally and all anomalies occur at the time of
transmission / reception switching, but the power supply is switched with one circuit as in the
present invention and it is used as a trigger to receive / emit light If the element works, the
timing is naturally taken to switch, and it will be 3.7 if the company causes abnormal oscillation.
Also, in the case of one circuit switch compared to two circuit switches, equipment? It can be
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