Abstract: A strobe alarm circuit which utilizes an optocoupler in the DC-to-DC converter portion of the circuit for repetitively connecting and disconnecting an energy-storing inductor across a DC power source. The light-emitting diode portion of the optocoupler is connected in parallel with a resistor network which continuously monitors the current flowing through the inductor; when the inductor current has attained a value at which the sum of the voltages developed across the resistors of the network is sufficient to turn on the LED, the switch portion of the optocoupler is turned on and disconnects the inductor from across the source. A thermistor connected in parallel with one of the resistors of the resistor network compensates for changes in values of the elements of the optocoupler which may occur due to temperature changes.

Abstract: A strobe light of a type suitable for safety, notification, and intrusion systems and the like includes a base, a lens having a generally cylindrical side wall defining an opening at one end, having an end wall at the other end and being attached at its open end to the base, and a lamp/electronics assembly mounted on the base and received within the side wall of the lens. The base has a generally planar main wall that is shaped and dimensioned such as to form closure for the opening of the lens side wall and having a front surface facing the end wall of the lens and a rear surface facing away from the end wall of the lens. A generally centrally located mounting boss having a threaded socket is adapted to receive a threaded mounting member.

Abstract: A strobe light circuit for flashing a flashtube at a desired frequency includes a transformer the primary of which is repetitively connected and disconnected across a D.C. power source by a switch so that energy stored in the primary winding during closed periods of the switch is transferred to the secondary winding of the transformer, with a step-up in voltage, during open periods of the switch, and through a diode to an energy-storing capacitor connected in parallel with the flashtube.