Switching amplifier and electronic siren employing the same

Details Switching amplifier and electronic siren employing the same Switching amplifier and electronic siren employing the same

1982-09-15

1987-05-26

Caldwell, Sr., John W.

Communications: electrical

Audible indication

Ultrasonic pest control

340405, G08B 300

Patent

active

046689389

ABSTRACT:
A signal having a rectangular waveform, typically in the audio frequency range, is capacitively coupled to a pair of Darlington circuits which are connected in a push-pull arrangement across the primary winding of a power transformer. A clamping circuit insures that the breakdown voltage of the base-emitter junction of the input transistors of the Darlington circuits will not be exceeded during coupling capacitor discharge.

REFERENCES:
patent: 4180809 (1979-12-01), Feldstein
patent: 4189718 (1980-02-01), Carson et al.
patent: 4237448 (1980-12-01), Weinberg
patent: 4238787 (1980-12-01), Pearlman et al.
"Radio Electronics", by Samuel Seely, McGraw-Hill, Copyright 1956, pp. 119-120.
"Electronic Devices and Circuit Theory", by Boylestad and Nashelsky, Prentice-Hall, second edition, Copyright 1978, pp. 337-338.

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