Onkyo Kabushiki Kaisha

Yoshiro Koga

Kenji Nakao

Hiroshi Kume

A constant-voltage power supply circuit having a light-emitting element and a photosensitive element optically coupled with each other and a driving power source for driving the light emitting element, the circuit using an output voltage of the photosensitive element as a reference voltage; and an amplifier circuit using a constant current converted from the reference voltage of the constant-voltage power supply circuit; and a DA converter adapted for delivering binary digital signals to the constant-voltage power supply circuit.

Constant-voltage power supply circuit and amplifier circuit and DA

A DC power supply circuitry comprises an AC power source transformer with its secondary winding having a center tap; a rectifier circuit; a smoothing circuit; and a bidirectional switching circuit having predetermined threshold values, interposed in between the center tap and the smoothing circuit.

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Neyagawa, Japan

Yoshiro Koga