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JPS52114015

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DESCRIPTION JPS52114015
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a circuit diagram showing the principle of the
present invention, and FIG. 2 is a circuit diagram of a specific embodiment. 3.4 ······· Diodes 2, 5, 8
··· · · · · · · · ······················· Switch, 12, 15 ··········· Resistance, 13.14 ······diode.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an input switching
circuit suitable for switching input signals of audio equipment and the like. -Conventionally, in
audio equipment such as a radio receiver with stereo, as a changeover switch for switching
different input signals and supplying the pre-amplifier, mechanically switch the contacts and
switch like a rotary switch or a bush switch. Books have been used. However, in these switches,
since the signal current flows to the switching terminal, noise at the time of switching, generation
of crosstalk due to leakage between the switching terminals, distribution to the switching
terminal Ii! 11, ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- There were drawbacks such as the increase of the number of
switches of the company switch in the case of multi-channel, the increase of noise, and the
increase of the number of switches. An object of the present invention is to provide an input
switching circuit which can improve the performance and reduce the number of circuits of the
switch without the disadvantages of the prior art described above. A feature of this invention is a
circuit in which a diode is connected in the forward direction between the input terminal and the
transmission circuit, a diode is connected in the reverse direction between the input terminal and
the ground, and a positive or negative voltage is applied between the diodes. At the point where
The invention will now be described by way of example with reference to the drawings. FIG. 1
shows the principle of the present invention, in which capacitors 1, 6 and a diode 4 are
connected in series in the forward direction between an input end and an amplifier 7, and a
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resistor 2.5 and a diode 3 are connected. Connect to ground as shown. The common terminal of
the changeover switch 9 is connected between the diodes 3.4 through the resistor 8. 4 ° C.
············· 1-2 [2 に お い て Suppose that the common terminal of the switch 9 is connected to the
positive voltage element BK in the first 7 or more configuration. The diode 4 has a resistor 5.
Resistor 8 is forward biased and diode 3 is reverse biased by resistor 8. Therefore, the diode 4 is
turned on, the diode 3 is turned off, and the input signal is sent to the amplifier 7. Next, when the
common terminal of the switch 9 is connected to the negative voltage -B, the diode 3 is forward
biased and turned on, diode 4 is reverse biased and turned off, and the input signal is an
amplifier Not transmitted to 7 Therefore, the switching operation can be performed only by
switching the common terminal of the switch 9 to the positive and negative voltage sides. In FIG.
1, the resistors 2, 5 and 8 are largely selected so as not to affect the circuit. FIG. 2 shows a
specific embodiment of the present invention, and shows a switching path between a phono
signal and a tape signal.
In the figure, 11 is a capacitor, 12.15 is a resistor, 13.14 is a diode, 10 is a switching switch, and3 switch is otherwise identical to that shown in FIG. The illustrated state indicates a phono state.
That is, since the diode 3 is off and the diode 4 is on, the phono signal is transmitted to the
amplifier 7, but the diode 15 is on and the diode 14 is off, so the tape signal is grounded and the
amplifier 7yc is not transmitted. In the tape state, since the common terminal of the switch 9 is +
IIK connected to the common terminal of the -B1 switch 10, the phono signal is grounded and
the tape signal is transmitted. As apparent from the above description, according to the present
invention, since the changeover switch switches only the DC voltage, no signal current flows in
the changeover terminal. Therefore, noise at the time of switching, crosstalk due to leakage
between the switching terminals, hum by the wiring to the switching terminals, noise, and the
like can be improved. Further, since the number of switching circuits may be one, there are
effects such as easy and economical application to multiple channels.
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