JPS5886693U - Automatic power cutoff device for electronic musical instruments - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing a conventional automatic power cutoff device for an electronic musical instrument, FIG. 2 is a block diagram showing an automatic power cutoff device for an electronic musical instrument according to this invention, and FIG. 3 is a circuit diagram showing the automatic power cutoff device for an electronic musical instrument according to this invention. FIGS. 4 and 5 are circuit diagrams showing a specific example, and are principal part circuit diagrams showing a modification of the circuit shown in FIG. 3. 10...Power supply, 12...Three-terminal switch means,--------i- Q6 Calendar

Claims (1)

[Claims for Utility Model Registration] 1(a) A three-terminal switch means to which a power supply voltage is applied to the input end and an electronic musical instrument circuit connected to the output end, and (b) one end to the control end of the switch means. (C) a starting circuit connected to the other end of the power switch, which makes the switch means conductive in response to an on operation of the power switch, and becomes non-conductive by itself after the conduction; d) a holding circuit that is connected to one end or the other end of the power switch and maintains the conduction state after the switch means starts conducting; (e) starts measuring time after the power switch is turned on;
(f) a timekeeping circuit that stops the holding operation of the holding circuit on the condition that a predetermined period of time has elapsed after the reset if reset, or after the start of the timekeeping if not reset; (f) the electronic musical instrument circuit; 1. An automatic power cutoff device for an electronic musical instrument, comprising: a signal detection circuit that detects an information signal from a source and resets the timekeeping circuit as long as the information signal is detected. 2 Utility Model Registration Scope of Claim 1. The automatic power cutoff device for an electronic musical instrument as set forth in claim 1, wherein the startup circuit is comprised of a circuit in which a capacitor and a resistor are connected in series. Device. 3 Utility Model Registration Claim 2. The automatic power cutoff device for an electronic musical instrument as set forth in claim 2, wherein the power switch has a break contact that provides a discharge path to the capacitor of the startup circuit. Automatic shutoff device. 4 Utility Model Registration Scope of Claim 1 In the automatic power cut-off device for an electronic musical instrument, the timing circuit includes a capacitor, a constant current source for charging the capacitor after the III source switch is turned on, and -1f7J. means for detecting that the charging potential of the capacitor reaches a predetermined value and stopping the holding operation of the holding circuit; and a reset handrail for discharging the capacitor in response to an output signal of the signal detection circuit. An automatic power cutoff device for an electronic musical instrument, characterized in that: - 5 Utility Model Registration Scope of Claim 1. In the automatic power cutoff device for an electronic musical instrument according to claim 1, the time measurement circuit includes a pulse generator that generates a pulse after the power switch is turned on, and a pulse generator that generates a pulse generator that generates a pulse generator. and a means for detecting that the count value of the counter reaches a predetermined value and stopping the holding operation of the holding circuit, and of the pulse generator and the counter, at least the counter An automatic power cutoff device for an electronic musical instrument, characterized in that the device is reset in response to an output signal from a signal detection circuit.