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JPH07135431

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DESCRIPTION JPH07135431
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is an amplifier
circuit applicable to a drive circuit of a speaker.
[0002]
2. Description of the Related Art In a conventional amplification circuit, a drive circuit of a
speaker is formed by an amplification circuit which is not considered to generate a load.
[0003]
SUMMARY OF THE INVENTION When the drive circuit of the speaker is made with the
conventional amplification circuit, there is a problem in reproducing the input voice due to the
power generation by the speaker.
[0004]
An object of the present invention is to provide an amplifier circuit in which the voltage applied
to both ends of the speaker is a voltage proportional to the input sound even when a load such as
a speaker is generating electricity.
[0005]
SUMMARY OF THE INVENTION In order to achieve the above object, in the amplifier circuit of
the present invention, a differential amplifier 2 is used to compare an input audio voltage and an
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output voltage.
[0006]
The output voltage is reduced by resistors 4 and 5 in order to be able to compare it with the
input voltage.
The voltage amplification factor of the differential amplifier 2 is 1 in which the resistance 5 has a
relationship of ((DC resistance of speaker) + resistance 4 + resistance 5) / resistance 5 = voltage
amplification factor of the differential amplifier 1.
[0007]
[Operation] If the speaker is driven by the amplifier circuit configured as described above, a
forward electromotive force is generated in the speaker and the difference between the voltage
generated at both ends of the resistor 5 and the input voltage is compared by the amplifier 2,
The reverse of the electromotive force is returned to the differential amplifier 1.
Therefore, the forward electromotive force generated in the speaker is apparently canceled.
The same applies to the back electromotive force.
The same applies to voltages due to capacitance and reactance.
[0008]
DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to the drawings, an embodiment of
the present invention will be described. The load 3 is connected to the output of the differential
amplifier 1 in FIG. 2, the load 3 is connected to the resistor 4, the resistance 4 is connected to the
resistor 5, Wire from 5 to ground. The connection between the resistors 4 and 5 is connected to
the positive input of the differential amplifier 2.
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2
[0009]
The positive input of the differential amplifier 1 is connected to the input 6. The negative input of
the differential amplifier 2 is connected to the input 6. The output of differential amplifier 2 is
connected to the negative input of differential amplifier 1. In order to compare the output voltage
with the input voltage, the relationship between the resistors 4 and 5 and the voltage
amplification factor An of the differential amplifier 1 satisfies the following equation.
[0011]
The voltage amplification factor of the differential amplifier 2 is one. By doing this, the circuit is
stabilized by increasing the DC component of the load.
[0012]
Since the present invention is configured as described above, the following effects can be
obtained.
[0013]
Regardless of the speaker's electromotive force, a voltage proportional to the input voltage can
be generated across the speaker.
[0014]
It is also possible to increase the stability of the circuit by putting resistors 4 in series.
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3
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