Abstract: An interface device for the remote control of pulse activated, mechanically held relays or master switches by control devices which have a continuous output, such as time clocks, security system devices, and thermostats. The presence of a continuous input signal is decoded by the electronic circuitry into a momentary output signal to be applied to the "on" side of a remote control relay. When the input signal is removed, the device decodes this lack of signal and produces a momentary signal to be applied to the "off" coil of the relay. Input terminals are provided with four types of input signals -120 volts AC, 12 volts DC, a contact closure, and a contact opening. Three output terminals are provided, namely, "common," "on," and "off" terminals for connection to the remote control relays. Another set of terminals can be provided to allow the use of an external power supply load with the device, by incorporating a control relay within the device capable of handling 20 amps.

Abstract: In a DC/DC stabilized voltage converting unit having a series circuit including an input filter, a converter stage having a control input and an output filter, the improvement comprising: a control stage having an output connected to the control input; a voltage regulating circuit receptive of an output of the output filter and having an output applied to the control stage; an anti-overvoltage and anti-overcurrent stage receptive of an output of the converter stage and having an output applied to the control stage; a voltage converter chain coupling circuit for effecting the linking of units in a chain; an internal monitoring and commutating circuit connected between the voltage regulating circuit and the control stage for surveying the outputs of the converter stage; a visually and electrically signalling alarm circuit receptive of the outputs of the output filter and having the outputs thereof applied to the chain coupling circuit; and wherein the chain coupling circuit includes a first input for linking to

Abstract: An operation indicator for an automatic flashing device comprising a first indication means which visually indicates a reaching to a predetermined voltage of main capacitor and readiness for proper completion of flashing of an automatic light adjusting, and a second indication means which indicates a selected one of them by sound, and a switching means which connects or disconnects said second indication means to the circuit of the device.By the abovementioned construction, the user can realize readiness of automatic flash operation both by eyesight and by audition.

Abstract: An electrical system monitor is shown as employing a quad-chip C-MOS integrated circuit for sensing when the voltage of a monitored circuit, monitored sub-circuit, monitored branch circuit or monitored circuit portion deviates, by a preselected magnitude, from a selected magnitude of voltage; upon such deviation occurring, a related switch is actuated causing energization of sensory warning apparatus and, in another aspect of the invention, a switching device is actuated to open a related load circuit.In a further embodiment the quad-chip C-MOS integrated circuit is, in the same general manner, responsive to sensing preselected deviations from a selected magnitude of current and, upon the occurrence thereof causing actuation of related switch means.

Abstract: A circuit for monitoring the voltage across a sensing resistor in series with a load, wherein two reference currents are generated, each dependent both on temperature and on the voltage on a power supply line, which voltage is also temperature-dependent and exhibits a temperature coefficient of such a sense and magnitude that the changes in a reference current due directly to changes in temperatures are substantially offset by the changes in that reference current due to changes in the voltage on its power supply line, which changes are in turn due to the same changes in temperature.

Abstract: A current limiting voltage sensing circuit especially suited as an annunciator input circuit is disclosed. It includes a radiation emitting device circuit, a current limiting circuit for maintaining the current supplied to the voltage sensing circuit at a substantially constant value while supplying the needed current to the radiation emitting device circuit, and a radiation sensitive device circuit coupled to the radiation emitting device and electrically isolated from it for converting from the radiation signal into an electrical signal. In one arrangement, the input to the voltage sensing circuit is a full-wave rectifier so that it can be used for detecting an ac voltage or a dc voltage in either direction.

Abstract: An electronic flash device comprising a DC-DC converter circuit which converts a low voltage DC source to a high voltage DC current for charging a main discharge capacitor, a flash discharge tube which is adapted to flash by means of the energy stored in the main discharge capacitor, and a display circuit. The DC-DC converter circuit includes an oscillation transformer having a primary winding, a secondary winding magnetically connected with the primary winding, an auxiliary winding and further a second auxiliary winding, an oscillation transistor, and an auxiliary capacitor connected with the auxiliary winding for causing the oscillation transistor to be started; and the display circuit is lit for display when the voltage generated across the second auxiliary winding and the voltage applied across the auxiliary capacitor are superposed to reach a predetermined value.

Abstract: In a flash unit, wherein completion of the charging of a main capacitor from a DC-DC converter is indicated by a first indicator connected to the converter by a first voltage dividing circuit, there is provided a second voltage dividing circuit connected to the DC-DC converter and a switching circuit disposed between the second voltage dividing circuit and the first indicator so that an output voltage sufficient to energize a second (separate) indicator reliably is produced from the second voltage dividing circuit upon operation of the first indicator.

Abstract: An automobile burglar alarm including a battery voltage level sensor to be connected to the positive terminal of the automobile battery for providing an output signal level indicating the battery voltage level and responsive to reduction in the automobile battery voltage when an automobile dome light or trunk light supplied by the battery is turned on to provide a changed output signal level which persists for a predetermined time period, indicative of the reduced battery voltage level, a normally non-conducting transistor connected in circuit with the automobile headlight and horn relays to a supply voltage source to energize the relays when the transistor conducts, a timer circuit connected to the transistor to supply a timed output signal for causing the transistor to conduct for a predetermined short conduction interval, and an operational amplifier coupled to the sensor and the timer circuit for supplying an amplified signal adequate to cause the timer circuit to produce the timed output signal.

Abstract: A glow lamp for indicating charged readiness of a flash apparatus is provided with a predetermined burning voltage corresponding to a specific charge voltage of the storage capacitor for the flash circuit, and the ignition voltage for the glow lamp is applied as periodic ignition pulses derived from voltage pulses occurring on periodic switching of the converter. The result is a more accurate response of the glow lamp to the desired charge value of the storage capacitor than is obtained by using the ignition voltage of the glow lamp as a threshold value.

Abstract: Control circuit system wherein low level signals are delivered through small (miniature) gauge control conductors to remote control circuit breakers to control connection of load devices to load bus through use of solid state circuitry. Such control may be used between the flight station of an aircraft and the various load centers remote therefrom, in an automobile or in an industrial or utility system. The circuitry is also responsive to faults in the load circuits, and current limiting warning lights (CLWL's) located in the power supply of the control conductors may limit current and indicate the status of faults in the control and/or remote power circuits. A large number of CLWL's for the different circuits may be arranged in a matrix at a control station and means with corresponding load identifying indicia are provided to facilitate changes and correlation of lighted CLWL's with respect to the controlled load switching device.