Electronic amplifier

Details Electronic amplifier Electronic amplifier

G - Physics

08

B

330/17, 84/46

G08B 3/00 (2006.01) G08B 3/10 (2006.01)

Patent

CA 1126352

6B PSE 6380.1 ELECTRONIC AMPLIFIER Abstract of the Disclosure An amplifier particularly suited for ampli- fying 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 bias- ing 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.

356550

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