Electrical apparatus and method for electrically simulating a no

Details Electrical apparatus and method for electrically simulating a no Electrical apparatus and method for electrically simulating a no

1979-12-12

1981-09-15

Waring, Alvin H.

Communications: electrical

Audible indication

Ultrasonic pest control

340393, G09B 902, G08B 310

Patent

active

042900549

ABSTRACT:
An electrical apparatus and method for electrically simulating noise resulting from the thermodynamic expansion of a gas inside a chamber whose volume is varied, is characterized in that it comprises, in series, a capacitor of fixed capacitance and means for varying with respect to time the potential at at least one of the terminals of the capacitor, the potential variation depending on the variation of the volume with respect to time and on the nature of said expansion.

REFERENCES:
patent: 3893107 (1975-07-01), Schedler
patent: 3913097 (1975-10-01), Schedler
patent: 3913245 (1975-10-01), McCanney
patent: 4023078 (1977-05-01), Olliges et al.

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