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DESCRIPTION JPS53113627

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DESCRIPTION JPS53113627
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a connection diagram showing an example of a
conventional microphone device, FIG. 2 is a connection diagram showing one embodiment of the
microphone device of the present invention, and FIG. 3 is a wire for explaining the present
invention. FIG. 4 is a connection diagram showing another embodiment of the present invention.
1 is a microphone, 2 is a field effect transistor, 3 is a battery, 5 is an output capacitor, 7 is a
capacitor, 8 is a resistor, and 9 is a switch.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a microphone
device using a field effect transistor as a microphone amplifier, and in particular, to prevent
generation of noise when the power switch is turned on or off. Conventionally, a microphone
device 114 shown in FIG. 1 has been proposed as a microphone device using a field effect
transistor for a microphone amplifier. That is, in FIG. 1, 11J indicates a microphone, for example,
a condenser microphone 1) I ≦ Ilophone, and one end of the condenser microphone + 1 + 0 is
connected to the gate of the field effect transistor (2) constituting the microphone amplifier, The
other end of the condenser microphone ill is connected to the negative electrode of the battery
+37 constituting the DC power supply, and is connected to the positive electrode of the battery
131C via the field effect transistor t21 ′ ′ drain power switch 147′i, and the field effect
transistor (2 ) Is connected to the negative terminal of the battery 13J via the output cauldrance
(5101 winding @ (5 m), and the sound from the other layer of the secondary winding (5 b) of the
output cauldrance (5) Output terminals (6m) and (6b) for supplying all signals are respectively
derived. In such a conventional microphone device, the sound polarization from the condenser
microphone 111 is supplied to the output terminals (6a), (6b) via the field effect transistor f21
and the output capacitor, In the conventional microphone device, the power supply switch + 41i
is turned on and tIK, the battery (DC voltage N of 31). Is the drain of the field effect transistor
12+, and this field effect transistor i + 21? A transient current flows, and depending on this trace
current, a signal is obtained at the output terminal (6Jl) (6b) K via the output signal (5), which is
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a relatively large noise level. In addition, when the power supply switch (4) t-is turned off, the
voltage supplied to the drain of the field effect transistor 21 changes from the power supply
voltage EO to zero, so that the transient is performed via the metal of the field effect transistor
About 1 f! As t flows, relatively heavy 1 nobel noise appears at the output terminals (61) and (6b)
due to the four current flows. In view of the foregoing, the present invention is designed to
prevent generation of a relatively large level of noise when the power switch is turned on / off as
described above. Hereinafter, one embodiment of the microphone Iff small cover according to the
present invention will be described with reference to FIG. In FIG. 2, the parts corresponding to
FIG.
In FIG. 2, the drain of the field effect transistor 21 is connected to the electric field m131 (3) O
negative electrode KI via a capacitor (7) of 100 μF or more, for example 500 J 4 F, which
constitutes a time constant circuit. The effect transistor (2) O drain is connected via a resistor
181 constituting a time constant circuit to a switch (910 movable contact (9a) K) constituting a
power supply switch, one fixed contact (9) of the switch (9) 9b) is connected to a battery (a
positive electrode KII of 31 and a switch of a switch (9; the other O fixed contact (9C) is
connected to a battery 1310 negative electrode KIN). When the power switch is turned on, the
switch (910 movable contact (9a) is connected to one fixed contact (9b), and when the power
switch is turned off, the movable contact of switch at91 ( Connect 9a) to the other fixed contact
(9C) K. Others are 1st +! ! Configure the same as lI. Since the present invention is configured as
described above, when the power switch is turned on, that is, when connected to the movable
contact (9a) t-one fixed contact (9b) of the switching aj 191, the current from the electric a13 + is
The capacitor (7) K flows through the resistor 64 and charges this capacitor (71). In this case, the
voltage supplied to the drain of the field effect transistor 121 is this capacitor! The voltage across
the capacitor 7 is gradually increased according to the time constant determined by the
capacitance of the capacitor 7 O and the resistance value of the resistor 18 J, as shown in FIG. .
Therefore, at this time, the transient current flowing through field effect transistor +27 is
extremely small, and the noise due to this transient voltage fiK is extremely small. In addition,
when the power switch is turned off, that is, when the movable contact (9a) of the switch (91) is
connected to the other fixed point contact (9C) K, the charge stored in the capacitor (7) is the
resistor (8). 3) As shown in FIG. 3, it is gradually discharged with a time constant determined by
the capacitor (7) and the resistor 181 as shown in FIG. The voltage also decreases gradually.
Therefore, at this time, the transient current #i flowing through the field effect transistor 121tA
is small as well, and the noise due to the scarring current 5tK is extremely small. As described
above, according to the present invention, when the power switch of the microphone device is
turned on or off, there is an advantage that almost no noise is generated. Further, FIG. 4 is not
the other actual example of the present invention, a part KFi corresponding to FIG. I2 is
illustrated to explain the FIG. 4 FIG.
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In FIG. 4, a field effect transistor (two not more than v4yf: 100 AIF, for example 500 JIF
(connected to the positive terminal of the battery + 31 via a D capacitor (7)), and the field effect
transistor (210 drain is connected to a resistor It is connected to the point 1111 W (9a) of the
switch (9) through 181, and the other parts are configured in the same manner as in FIG. In FIG.
4, when the microphone device is not in use, the contact A (9 m) of the switch 191 is connected
to the other fixed contact (9 C) as shown, so the capacitor (7 a) is shown It is charged to the
power supply voltage like the electrode of. Now, when the power switch is turned on, that is,
when the movable contact (9a) of the switch (9) is connected to one constant contact (9b) of 10,000, the battery (, the charge fL from 31 is the field effect transistor +21 The voltage of the
drain of this field effect transistor (2) gradually rises to the voltage of the battery (3+) since it is
supplied to the drain and the potential difference between both ends of the capacitor (7a)
becomes zero. Also, when the power switch is turned off, ie, when the movable contact (9 &) of
the switch (9) is connected to the other fixed contact (9c) Klii, when configuring the 6J capacitor
(7a) and the resistor (8) The current from the battery 131 flows through the constant circuit, and
the voltage across the paper portion (8) gradually decreases according to the time constant
determined by the capacitor (7a) and the resistor (8), Since the voltage between both ends of the
resistor 1g1O is supplied to the drain of the field effect transistor f21, the voltage 4 of the drain
of the field effect transistor 2; Therefore, it can be easily understood that the same effect as in
FIG. Needless to say, the present invention is not limited to the above-described embodiment, and
various other configurations can be defeated without departing from the scope of the present
invention.
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