Abstract: A device of indicating the charging state of a battery including a series combination of a diode and an indicating lamp connected between an output terminal of a rectifying means of an alternator and a battery. A first switching means activates the indicating lamp when the battery voltage is less than a first lower predetermined value. A second switching means turns the first switching means off when the battery voltage rises above the first predetermined value. A third switching means reactivates the indicating lamp when the battery voltage exceeds a second higher predetermined value.

Abstract: The disclosed semiconductor voltage regulator comprises an NPN power transistor connected to a field coil of a battery charging AC generator and turned on and off through an NPN control transistor under the control of a Zener diode, a suppression diode for the field coil, and passive elements. The transistors especially including the power transistor and diodes without or with resistors form an integrated semiconductor element on a semiconductor substrate while the passive elements form a hybrid thick film integrated circuit on a ceramic substrate. The integrated element may be disposed on the ceramic substrate underlaid with a heat sink or directly on the heat sink.

Abstract: An AC generator charges a storage battery through a full-wave rectifier. The battery energizes a field generator coil through an indication lamp and two Darlington-connected transistors in their conducting state due to a flow of base current through them via a base resistor connected to the battery until a voltage across the generator reaches a predetermined magnitude. At that time, a Zener diode conducts to turn the two transistors off. The field coil is also connected to an intermediate voltage rectifier output terminal to be energized with a voltage from that terminal even if the filament of the charge indicating lamp is broken.

Abstract: A charge indicator circuit for a battery charging system is disclosed. The battery charging system comprises an alternator, a rectifier, a voltage regulator, and a battery. The rectifier comprises first and second rectified output terminals and a grounded rectified terminal. The field coil of the alternator is supplied by the second rectified output terminal of the rectifier. The regulator is coupled serially with the field coil and cuts off the field current when the voltage sensed at the second rectified output terminal exceeds a first predetermined level. The charge indicator circuit comprises a serial connection of a diode and an indicator lamp coupled between the second rectified output terminal and the battery, and a detector and switching network coupled between the junction between the lamp and the diode and a ground terminal.

Abstract: A method of manufacturing a semiconductor device having at least one power transistor and a plurality of small signal transistors formed on the same semiconductor substrate is disclosed. First, a base region of the power transistor and an isolating region are formed by diffusion simultaneously in an epitaxial layer on the semiconductor substrate. Second, an emitter region of the power transistor and the collector regions of the small signal transistors are simultaneously formed by diffusion, and finally the bases, and emitters of the small signal transistors are formed in succession by diffusion.