Electronic signal generator with periodically varying frequency

Details Electronic signal generator with periodically varying frequency Electronic signal generator with periodically varying frequency

1979-12-03

1981-09-01

Pitts, Harold I.

Communications: electrical

Audible indication

Ultrasonic pest control

340384R, G08B 300

Patent

active

042875102

ABSTRACT:
An astable multivibrator with an R/C coupling network establishing a nominal operating frequency in the KHz range works into a chain of binary divider stages stepping down that frequency to the order of one Hz. The last stage output or outputs of the divider chain are connected to the coupling network through a feedback path including a switching transistor, driven into conduction during alternate half-cycles of the multivibrator, whereby the charging rate of the network capacitance is modified in slow steps with corresponding changes in operating frequency. Several intermediate stage outputs of the divider chain are tapped by way of a coincidence gate to energize a loudspeaker via an audio amplifier with a pulse train having a basic cadence of several hundred Hz, modulated by the feedback, and an on/off ratio well below 1:1.

REFERENCES:
patent: 3759029 (1973-09-01), Komaki

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