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JPS56155585

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DESCRIPTION JPS56155585
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a circuit diagram of a crabbone microphone
showing an example, and FIG. 2 is a circuit diagram of a carbon microphone to which a monitor
circuit according to an embodiment of the present invention is added. 1.2: power supply
terminal, 3: output terminal, R1 ° R2: bias resistance, C: bypass capacitor, D two light emitting
diode, M: carbon microphone.
DETAILED DESCRIPTION OF THE INVENTION The present invention is also DC to monitor the
carbon micro Hoff D operation by flickering the brightness of the light emitting diode. 1 l-fS
sweet microphone monitor by VU meter. Or, there is a leveler with a light emitting diode, etc., for
C, but in any case the height 1 + [[i? l 'In addition to this, a circuit such as another amplifier is
required to operate the meter, which is complicated C. In the present invention, the light emitting
diode is flipped with a simple circuit configuration that can be added to the main body of the
cosplay mic cophone in order to remove these entry points, and the operation of the
phycrophone can be monitored by this flickering of brightness Yes ('I have a FIG. 1 is a circuit
diagram of a commonly used carbon microphone. In this operation, a DC current of about 4 A is
applied to the carbon microphone M from the DC power supply positive terminal 1 through the
DC bias resistor R1 and the change in the operation resistance of the carbon microphone M due
to voice etc. is used as an AC signal. It is taken out from the output terminal 3 via the AC bypass
capacitor C. FIG. 2 is a circuit diagram of a carbon microphone to which a monitor circuit
according to an embodiment of the present invention is added. A parallel circuit of a light
emitting diode D and a direct current bias resistor R2 is inserted between the light emitting diode
D and the negative terminal 2 of the direct current power supply, and the mounting direction of
the light emitting diode D is as follows. Follow the direction of the DC current of the circuit. The
values of resistors R1 and R2 are selected so that the current flowing through the diode D is
5rTIA to 10nIAt. Carbon micro phone M7) 力 Force resistance is expressed. ) C1 light emitting
diode D (a direct current flowing through <& lt; L, causing the brightness of the light emitting
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diode D to flicker. Cow's carbon micro ho / Mx remic output. The output tf-3t through the bypass
capacitor C is sung. Therefore, the intensity of the flicker of the light emitting diode D at the
microphone output / 1 ratio i + 1 1-f (so that the operation of the car radio microphone M can be
monitored. The brightness of the light emitting diode D can be adjusted by the values of the
resistors R1 and R2. As described in the following, the device according to the present invention:
The additional C microphone circuit of the two-or-nothing circuit C is a monitor, and it is
inexpensive and has a good space factor. And its functions can be enhanced. In addition, when
used as a radio device token, it can also be used for transmission display.
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