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Sept. 19, 1977 Secretary of Patent Office · 3 patent applicants post code 4sO! Hamatsu F? Cadet
9t ■ Address Hamamatsu City, Shizuoka Prefecture 'Nakazawacho 10-1 Telephone (834) 3621
(for) ~ 6 ■ Japan Patent Office Open Patent Gazette ■ JP-A-49-51851 Specification 1, Name of
Invention Speaker Excess Input Limiting Circuit Speaker A pair of inverting circuits which are
turned on in response to an excessive (direct current) input signal applied to the human power
terminal, and the load of the low frequency amplifier is disconnected from the amplifier in
response to the turning on of the inverting circuit. A switching circuit for connecting the load to
the low frequency amplifier again when the inverting circuit becomes non-conductive in
response to the disappearance of the input signal is provided in parallel with the low frequency
output circuit.
2 Claims
The present invention relates to an excessive (direct current) input limiting circuit for a speaker,
and more specifically, cuts off a low frequency circuit upon application of an excessive (direct
current) input to prevent the speaker from being destroyed. The present invention relates to an
excessive input limiting circuit. There are usually two types of conventional restriction or
protection circuits, one of which incorporates a semi-automatic return means, and the other
incorporates a fully automatic return means. It goes without saying that in the case of the semiautomatic return type, there is the inconvenience that when it comes out of the dangerous state,
the circuit must be operated again at the discretion of the person. Although the above-mentioned
drawback of the semi-automatic return type is eliminated in the full-automatic return type, there
is a disadvantage that the circuit configuration becomes complicated using a memory circuit etc.
and it becomes expensive. The present invention takes advantage of the fully automatic return
type 11 and eliminates the above-mentioned drawbacks and provides an inexpensive overinput
limiting circuit at a low manufacturing cost. The first object of the present invention is to provide
an inverting circuit which changes from the on state to the off state and from the off state to the
on state when the input voltage to the speaker exceeds a predetermined value, and an
electromagnetic or electronic switch. It is to drive by the output of the inverting circuit and to
shut off the excessive (direct current) input low frequency circuit to the speaker to prevent the
speaker from being damaged. A second object of the present invention is to configure a circuit
for achieving the first object described above at low cost and with high accuracy, and to eliminate
unnecessary noise generated when the power is disconnected EndPage: 1. Hereinafter, the
present invention will be described in detail by way of examples. FIG. 1 is a block diagram
showing an embodiment of the over-the-large-blade limit circuit according to the present
invention, wherein IN is an input terminal for attacking an input from a front amplifier etc. AMP
is an output amplifier-for example OCL, ITL, OTL Type no amplifier. OUT represents the output
terminal of the amplifier. Town ~ Rsa resistance, Q, ~ Q1 is a transistor, RL is a relay, sp is a
speaker. This circuit connects the output terminal OUT of the amplifier AMP to the speaker sp via
the movable contact C and the fixed contact a of the relay RL, and emitters the transistor Q
between the output terminal OUT and the winding of the relay RL. A relay drive circuit is
provided, which comprises a pair of inverting circuits and a transistor Q, which are coupled in
the form of a base ground to the ground and the transistor Q in the form of a base ground. Now,
the output terminal OUT of the amplifier AMP [if excessive DC or excessive AC voltage indicating
positive or negative polarity is added, the transistor Q or Q becomes conductive depending on
the polarity of the input, and the power supply B A current flows through the resistor R and the
transistor Q1 or Q, and the base potential of the transistor Q8 drops to put the transistor Q1 in
the cutoff state.
17) Result) The collector current of the transistor Q is reduced and the break state is' The
movable contact is returned to the make state and the movable contact is connected to the fixed
contact, and the speaker sp is disconnected from the output terminal OUT of the amplifier AMP. ,
Protect the speaker SP, which is a load, from dangerous DC power or excessive AC power. If there
is no excessive DC component or excessive AC component at the output terminal OUT of the
amplifier AMP, then the transistor Q. またはQd)gカットオフとなってトランジスタQ。 The
reference collector current flows through the relay, and the relay RE is automatically turned to
the break state again from the meter state. The movable contact C is connected to the fixed
contact a, and the speaker sp is connected to the output terminal O 廿 T of the amplifier MP.
(Returning to the normal state), only the proper AC power is supplied to the speaker SP, which is
the load, in this manner. FIG. 2 shows another embodiment of the above-described excessive DC
input signal limiter circuit 'described above. In the figure, the same reference numerals as in FIG.
1 denote the same components. In the figure, RrR1 ° 呟 resistance IQ, the ~ Q tube is a
transistor. As described above, when the output terminal OUT [positive or negative polarity DC
voltage of the amplifier AMP is applied, the transistor Q, t or Q operates according to the longterm polarity, and the power source B has a resistance Ra When the current flows through the
transistor Q or 喝 and the base potential of the transistor Q1 drops, the transistor Q1 enters the
conducting state 11AK. A voltage drop occurs across the resistor R, due to its emitter current.
Due to this voltage drop, the base voltage of the transistor Q40 becomes lower than the emitter
voltage, the transistor Q1 becomes conductive, and the transistor Q becomes cut off tlAK. The
bases of the source transistors Q- and 9 are provided between the output terminal OUT of the
low frequency amplifier AMP and the speaker SP, and the bases of the source transistors Q- and
9 are connected to the collector of the transistor Q4-Q1 of the differential amplifier composed of
the transistor 9 eQl. + Each transistor is connected so that it becomes a transistor low conduction
state 1111. Collector of the transistor Q, the transistor Q, is cut off), and at the same time the
transistor Q is cut off, the base potential of the collector of the transistor QI, Since the transistor
Qv is also cut off in the form of a cutoff 111, the speaker 8P4C, which is a load, does not flow a
direct current, and dangerous direct current power is cut off. When the DC component of the
output terminal OUT of the amplifier MP disappears, everything is restored as described above,
and the transistor Q is turned on.
In this embodiment, a triac or the like may be used as the transistor Q · eQ'f. FIG. 3 is a block
diagram of a power supply circuit for operating the excessive DC signal limiting circuit shown in
FIG. cl. C, a capacitor s "1g is a resistor, RD is a diode, -Q, a transistor, T is a transformer, S is a
switch for power on, and P is a power plug. If a delay circuit configured with a transistor Qls
resistance R11 and a capacitor C1 is provided in a rectification circuit consisting of a die
EndPage: 2 ode RD and a capacitor C1 connected to the transformer T02 secondary side winding
end, amplification @ AMI When the power-on switch S is turned on, the unnecessary noise (click
noise) generated during a predetermined time load (speaker 5 P) KTo 9 [1 more O 9 9 K this
invention adds to the speaker And an inverting circuit that operates by detecting an excessive DC
signal (pulsed input) of either positive or negative polarity applied to the load input terminal. The
low frequency power amplifier 'and the switching circuit (electromagnetically, m reserved)
connecting and disconnecting the load and the speaker that is its load are provided in parallel
with the low frequency output circuit. Since the load is automatically disconnected from the
amplifier when the DC input signal is applied, the protection to the load can be made golden, and
the use of a differential amplifier as a switching circuit can be performed electronically. Since the
transistor gate is driven K, it can be turned off without any transient time peculiar to the
transistor, and a delay circuit is provided in the power supply of these circuits, so that
unnecessary noise can be minimized. Have an effect.
1 to 3 show one embodiment of the present invention, where 1E is a block diagram of the
excessive input limiting circuit, and FIG. 2 is an excessive DC current showing another
embodiment. FIG. 3 is a block diagram of an input limiting circuit, and FIG. 3 is a block diagram
of a power supply circuit. ■ · · · Input terminal, 0 UT-, Output terminal, AMP · · · · · · · amplifier ·
eR1 · · · · · · · resistance eC1 eC * '· · · capacitor eQ 1 to Q, · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · eQ1-Q, ... transistor, RL ... relay, SP ... speaker. RD・
・・ダイオード、S・・・スイッチ、P・・・プラグ。 Patent assignee Japan Musical
Instruments Manufacturing Co., Ltd. lEndPage: 36, agent other than the above zip code 110
address Tokyo Ueno 3-chome 23-6, Taito-ku, Tokyo 9: 憚 name (6 o 94) is 士, ・ t 7 '5-4EndPage: 4
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