Electronic siren amplifier

Details Electronic siren amplifier Electronic siren amplifier

1979-08-31

1980-12-09

Pitts, Harold I.

Communications: electrical

Audible indication

Ultrasonic pest control

340405, G08B 300

Patent

active

042387876

ABSTRACT:
An amplifier particularly suited for amplifying relatively low voltage level siren tone signals in an electronic siren. The amplifier includes an output transformer having first and second primary windings and having a secondary winding for connection to a loudspeaker. Each primary winding is connected during operation between a voltage source and ground and each includes first and second winding sections. Also included are first and second switching devices disposed between the winding sections of the first and second primary windings respectively for opening and closing the circuit between the winding sections of each primary winding in response to the signals which are to be amplified. Circuitry is provided for biasing each output transistor hard off when the other output transistor is conducting. Additional circuitry is provided to enable the amplifier to operate class AB to amplify speech signals.

REFERENCES:
patent: 2930985 (1960-03-01), Basharrah
patent: 3438028 (1969-05-01), Stewart
patent: 3504364 (1970-03-01), Abel
patent: 3747092 (1973-07-01), Smith
patent: 3810169 (1974-05-01), Locke

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