Electronic remote control transmitter

Details Electronic remote control transmitter Electronic remote control transmitter

H - Electricity

03

B

349/2, 325/32

H03B 5/20 (2006.01) H03B 5/24 (2006.01) B06B 1/02 (2006.01)

Patent

CA 1068347

ABSTRACT OF THE DISCLOSURE An electronic remote control transmitter employs a two transistor cascade oscillator having positive and negative feedback loops. The oscillator voltage is supplied through a switch assembly containing a plurality of momentary contact switches to a pair of voltage dividers supplying signal voltages in predetermined ratios to a two branch circuit in the negative feedback loop. One branch contains an inductor and the second branch a capacitor. Closure of any switch completes the DC circuits for the transistors. Signal voltage is supplied to the branches to produce a minimum amplitude, zero phase shift condition which establishes oscillation at that predetermined frequency. The output of the oscillator is amplified by a third transistor and supplied to an ultrasonic transducer for generating acoustical control signals. -1-

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