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JPS5897912

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DESCRIPTION JPS5897912
[0001]
The present invention is low frequency amplification 1ius, 4! Relates to the output stage of the
amplifier circuit. An example of a conventional low frequency amplification circuit will be
described for the first IIK. (1) is a low frequency 9 input terminal, (2) is an amplification circuit,
(3) is its output stage, and (2m) is a pre-amplification section. is there. The output stage (3) is
usually constructed by connecting amplifying elements (3 烏) and (3-) such as a pair of
transistors in a positive connection. The illustrated example shows the case where the transistors
are connected in a complementary manner. (4m) (4b) is a direct current power supply, and is
configured with a two-power supply configuration. S (5b) is for smoothing. Power supply (4 m)
and (4 b) K respectively connected in parallel. (6) is a speaker as a load of such an amplification
circuit. In FIG. 2, 0 in FIG. 2, (3) indicates the output from a pair of transistors (3) (3b) as a power
supply, and (5) indicates a capacitor. (5 m) It is an equivalent capacity of (5 b). As is apparent
from FIG. 2, the voltage V supplied to the speaker (6) K is the output voltage E of the amplifier
circuit (2), the power source is the impedance of the speaker (6), and C is a capacitor The
capacity of 5). Therefore, the voltage V applied to the speaker (6) depends on the frequency /
signal of the signal output from the amplifier circuit (2) K, and the impedance ZK of the speaker
(6) is a capacitance of a size large enough to be negligible. Although it does not depend on
frequency / if capacitor (5) having a capacitor is used, in reality the impedance 2 of the speaker
(6) is as low as 2 to 10 Ω, and the capacitance C of the condenser (5) Under such conditions, the
voltage V applied to the speaker (6) has a characteristic of falling downward in the direction of
the low band as shown in FIG. And the amount of this fall does not become more than l48 at the
lower limit of the audible band, but the characteristics of the whole audible band and the
damping 7 actor also fall toward the low band, so the auditory energy balance is It's up to the
highs and it feels like 5 This = the frequency of the signal for which the impedance of the 2
'denser (5) is supplied by the output transistor (3)! And is inversely proportional to The present
07-05-2019
1
invention avoids the disadvantages of the present invention. For a detailed description of the
present invention with reference to FIG. The parts corresponding to those in FIG. 1 are given the
same reference numerals and the explanation thereof is omitted.
In the present WAK, inductance elements (7a) and (7b) are respectively inserted between the
capacitor (5 畠) and the amplification element (31) and between the capacitor (5b) and the
amplification element Ob). It is Furthermore, in this case, the resonance frequency f · determined
by the inductance element (71) and the capacitor (5 畠) and the resonance frequency fo
determined by the inductance element (5b) and K are respectively selected at the center of the
audible band. In the case of inductance, it is the inductance value of the inductance element (7M)
(7b). ), That is, the resonance frequency f · is SOO as shown in FIG. The values of the inductance
elements (71) and (7b) and the values of the capacitors (5m) and (5b) are set so as to be between
Hz and zKHz. According to such a configuration, as shown in FIG. 5, 5K. The impedance when the
power supply side is seen from the output transistors (3 heat) and (3b) is 7 lower at the
resonance frequency fo, and has a characteristic of being folded and shielded symmetrically in
the left and right direction. As shown in FIG. 6, it is symmetrical about the resonance frequency f
·. Therefore, in the prior art, the one where the aural energy tends to be biased to the high band
is 0 or more, which is easily reformed by the present invention, and thus the final RK negative
feedback is not applied to the amplifier. The use of the circuit according to the invention is
particularly advantageous. It is to be understood that the adjustment of the flatness indicated by
sl + tc can be achieved by connecting in parallel (or series) K each variable resistor * <S (8b) to
these inductance elements (7 麿) (γb) It becomes possible. It is also possible to use each of the
direct current resistance components of the inductance elements (7 畠) and (7b) without
inserting the five resistors (8 and 8b).
[0002]
Brief description of the drawings
[0003]
1 is a connection diagram showing an example of a conventional low frequency amplification
circuit, FIG. 2 is an equivalent circuit diagram thereof, FIG. 3 is a curve diagram showing seventy
characteristics, and FIG. 4 is a low frequency amplification circuit according to the present
invention The connection diagram and FIGS. 5 and 816 are curve diagrams showing
characteristics respectively.
07-05-2019
2
(3 畠) (lb) is an amplifying element, (4 烏 X 4 b) is a DC power supply, (58) (Sb) is a capacitor, (6)
is a negative IR as a speaker, (71) (7 b) is an inductance element . Figure 1 ri's 21 '1 figure 3
back to back X (nano-1
07-05-2019
3
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