JPS6244232B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides an apparatus that can perform an alarm operation, such as a radio receiver with a clock, by using an intermittent alarm signal from a clock circuit. The purpose is to enable easy selection and use of alarm clocks.

An embodiment of the present invention will be described below with reference to the accompanying drawings. In the figure, 1 is a power supply, 2 is a power switch, 3 is an alarm changeover switch, 4 is a reset switch, 5 and 6 are NAND gates that constitute an RS flip-flop, 7 is a voltage stabilization circuit, and a series control transistor 8 is connected to its collector. - Consists of a starting resistor 9 connected between emitters, error amplification transistors 10 and 11, voltage dividing resistors 12 and 13, a reference voltage Zener diode 14, and its bleeder resistor 15. A switching transistor 16 is inserted in series between the base of the series control transistor 8 and the emitter of the error amplification transistor 11, and its base is connected to the output terminal Q of the RS flip-flop via a current limiting resistor 17. ing. Loads 18 and 19 are, for example, load 18 a radio receiver and load 19 an audio amplifier. 20 is a speaker; 21 and 22 are diodes and coupling capacitors inserted in series between the loads 18 and 19; 23 is a starting transistor inserted between the set terminal S of the RS flip-flop and the ground; 24; 25 and 26 are a resistor and a capacitor that constitute a differential circuit inserted between the power switch 2 and the base of the starting transistor 23. The alarm changeover switch 3 has one end connected to the power supply line, the other end connected to the set terminal S of the RS flip-flop through a pull-up resistor 27 and a switching diode 28, and further connected from the resistor 27 through a switching diode 29. and is connected to the connection point between the diode 21 and the coupling capacitor 22. 30 is a resistor inserted between the cathode of the diode 21 and the ground. The reset switch 4 has one end connected to ground and the other end connected to a resistor 31.
The reset terminal R of the RS flip-flop is connected to the connection point between the reset switch 4 and the resistor 31. 32 is RS
This is a resistor inserted between the set terminal S of the flip-flop and the power supply line. The RS flip-flop also has a set terminal S connected to an input terminal 34 of an audible intermittent pulse (alarm signal) 33 supplied from a clock circuit (not shown).

Next, its operation will be explained.

Now, when power switch 2 is closed with alarm changeover switch 3 and reset switch 4 open, transistor 23 becomes conductive only immediately after switch 2 is closed due to the action of differential circuits 24, 25, and 26, and the RS flip-flop is set. be done. As a result, the output terminal Q of the RS flip-flop becomes high level, and the switching transistor 16 is made conductive via the resistor 17.

On the other hand, the power supply voltage is
Since the voltage is applied to the error amplification transistors 10 and 11 via the switching transistor 16, the series control transistor 8 becomes conductive, and the stabilized output voltage is output from the stabilized power supply circuit 7. As a result, the loads 18 and 19 operate, and an audio signal is obtained from the speaker 20.

Here, when the reset switch 4 is momentarily closed, the RS flip-flop is reset and its output terminal Q becomes low level, so the switching transistor 16 becomes non-conductive, the stabilized power supply circuit 7 stops operating, and the load 18 ,19
also stops working.

In this state where the loads 18 and 19 temporarily stop their operations, when the set time comes, an intermittent audible pulse 33 is applied to the input terminal 34 from the clock circuit. As a result, as described above, the RS flip-flop is set at the fall of the input pulse 33, the stabilized power supply circuit 7 becomes operational, the loads 18 and 19 operate, and an audio signal is obtained from the speaker 20. At this time, even if the audible range intermittent pulse 33 applied to the input terminal 34 disappears, the RS
The flip-flop continues in this state.

Note that the output of the load 18 makes the diode 21 conductive, is applied to the load 19 via the capacitor 22, is amplified by the load 19, and is emitted from the speaker 20.

In other words, the radio receiver performs a wake-up operation.

Here, to stop the alarm operation, the reset switch 4 is momentarily closed. As a result, the RS flip-flop is reset as described above, and the stabilized power supply circuit 7 and loads 18, 1
9 stops working.

Next, when the audible range intermittent pulse 33 is applied to the input terminal 34 with the alarm changeover switch 3 closed, the RS flip-flop is set in the same manner as described above, the potential of the output terminal Q becomes high level, and the stabilized power supply Circuit 7 operates and loads 18, 19
works. On the other hand, since the alarm changeover switch 3 is closed, the diode 28 becomes conductive when the audible intermittent pulse 33 applied to the input terminal 34 is at a low level, and the resistor 27 makes the potential at point A, which had been at a high level, become audible. It is intermittent with the intermittent pulse 33 and the resistor 3 is connected via the switching diode 29.
This intermittent audible pulse 33 is applied to both ends of 0, reverse biasing the switching diode 21, and as a result, the audio signal from the load 18 is cut off, and in its place, the intermittent audible pulse 33 is applied via the capacitor 22. The signal is applied to the load 19, amplified, and generated as an alarm signal from the speaker 20.

According to this configuration, the audio signal from the radio receiver can be used as an alarm sound by driving the stabilized power supply circuit and operating the load using the audible intermittent pulses from the clock circuit. By closing the alarm changeover switch 3, the audio signal from the radio receiver is intermittent in response to the audible intermittent pulse reproduced at the connection point of the switching diodes 28 and 29, thereby realizing an effective alarm. can do. Even if the radio receiver is out of synchronization, by closing the alarm changeover switch 3, an audible intermittent pulse from the clock circuit is generated as an alarm signal in place of the audio signal from the radio receiver. Can be done. Further, by momentarily closing the reset switch 4, the generation of the alarm sound can be stopped.

As explained above, according to the present invention, by using intermittent pulses in the audible range from the clock circuit, it is possible to select and use the wake-up operation by the radio sound and the alarm operation by the clock with a simple operation, and when the radio is operating. When an alarm signal is received, the radio audio signal can be made into an effective alarm sound by intermittent pulses in the audible range as an alarm signal, and the practical effects thereof are extremely large.

[Brief explanation of the drawing]

The drawing is a circuit diagram of a switching device in one embodiment of the present invention. 1...Power supply, 2...Power switch, 3...Alarm selection switch, 4...Reset switch,
5, 6... Configuring the RS flip-flop
NAND gate, 7... Stabilized power supply circuit, 16...
Switching transistor, 18, 19...Load, 20...Speaker, 21, 28, 29...Switching diode, 34...Audio range intermittent pulse input terminal.

Claims (1)

[Claims] 1.Equipped with an audio amplifier having an input terminal into which an audio signal from a radio receiver and an audible intermittent pulse as an alarm signal from a clock circuit are input, and in response to an alarm changeover switch, the audio signal or the audio signal is input to the audio amplifier. A switching device for selectively inputting an audible intermittent pulse, the voltage stabilizing circuit being activated in response to the audible intermittent pulse to supply power to the radio receiver and the audio amplifier. a control means that is activated in response to operation of a reset switch to set the voltage stabilizing circuit to an inoperative state;
activating means that is activated in response to the operation of a power switch and activates the control means to set the voltage stabilizing circuit to an operating state, and is connected between the clock circuit and the input terminal of the audio amplifier; Switching that reproduces the audible intermittent pulse at the input terminal in response to the operation of the alarm changeover switch, and inputs the audio signal from the radio receiver to the audio amplifier in response to the reproduced audible intermittent pulse. A switching device comprising switching means for controlling on/off of an element and for intermittent switching of the audio signal.