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DESCRIPTION JPS5110975

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DESCRIPTION JPS5110975
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an embodiment of the present invention,
FIG. 1 is a circuit diagram, FIG. 2A and 2B are schematic diagrams of waveforms, and FIG. 2 is a
schematic diagram showing charging and discharging of a capacitor. is there. 1 is an oscillation
circuit, 2 is an amplification circuit, 3 is a control circuit, R1 to 4 are resistors, C1 to 4 are
capacitors, 11 to 2 are transformers, Tr1 to 3 are transistors, RL is a relay, S is a relay contact, SP
is a speaker, ■ is a power supply. 1) For one room \ 2 j @ M to V 鉋) Ac (')) 1 → 1, 潴 肉 し し 一
] l −-167-
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electronic bell
sound device for use in, for example, a clock sound of a watch. Conventionally, in order to obtain
a bell sound (repetition damping sound), two oscillation circuits, such as modulation oscillation
for controlling the reference frequency, are provided in the gap of the reference frequency
oscillation circuit. In addition to the circuit being simplified to simplify the oscillation (broad), the
control method of the reference frequency is improved to obtain a sharp bell sound. This device
comprises an oscillating circuit 1 such as a Hartley circuit consisting of resistors R1 and R 龜 22,
capacitors C1 and C2, a transformer T1 and a transistor TRI as shown in FIG. 1, a resistor R3, a
capacitor c3, a transformer T2 and a transistor TR2. The amplifier circuit 2 including the speaker
SP is connected, and the control circuit 3 including the resistor R4, the capacitor C4, the
transistor TR3, and the relay RL is connected to the amplifier circuit 2. In the figure, S represents
a contact of the relay RL, and. With the above-described configuration, when the power supply V
is supplied to each circuit by switch means linked with the clock mechanism, for example, when
it is used for the clock sound of a clock, the output of the oscillator circuit l is transmitted
through the amplifier circuit 2. , The speaker sp is driven to generate a constant continuous
sound as shown in the second (1), but the output of the amplification circuit 2 is controlled by
the control circuit 3. That is, the capacitor C4 connected to the emitter of the transistor TR2 is
charged through the transistor TR3 as shown at point A- + B in FIG. 2 (b), and when the charge
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reaches a certain level, the transistor 3 is connected through the resistor R4. The current
required to start the operation of the relay RL is supplied to the base of the resistor TR3, and as a
result, the relay RL operates. Next, when the contact S is closed by the operation of the relay RL,
the charge stored in the capacitor C4 is dissipated instantaneously as shown by the point B → C
in FIG. 2 (b), and the base voltage of the transistor TR3 is also In order to descend, the relay RL
stops its operation, the contact point S is again opened, and the capacitor C4 starts charging
again as shown by the point C-1 ID in FIG. As described above, the control circuit 3 controls the
emitter voltage of the transistor TR2 of the amplifier circuit 2 by the charge and discharge action
of the capacitor C4, and the transistor TR2 generates a collector voltage as shown in FIG. The
figure shows the same repetitively decaying waveform as the actual bell sound, and the
electronic bell sound can be produced by driving the Svitz 7SP with the above-mentioned
waveform.
The above-mentioned sounding interval can be arbitrarily set by the values of the capacitor C4
and the resistor R4 of the control circuit 3. As described above, this invention makes it possible
to simplify the oscillation circuit by dividing the excavating circuit into one, and to control the
charging and discharging of the capacitor C4 for controlling the sound generation by the contact
S. Since the discharge is performed instantaneously, it is possible to obtain a sharp noise.
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