H - Electricity – 03 – K
Patent
H - Electricity
03
K
340/178, 340/124
H03K 3/26 (2006.01) H03K 17/96 (2006.01)
Patent
CA 1081817
ABSTRACT OF THE DISCLOSURE A touch control switch circuit operable by a hum pickup signal induced in a human body by a power supply line incorporates a compensation arrangement to eliminate false operation of the circuit by fluctuations in the power supply signal. The circuit comprises a touch receptor operable by electrical contact with the human body to receive the induced hum pickup signal, a touch detector responsive to the hum pickup signal received by the touch receptor for producing an output signal in response to a change in amplitude of the hum pickup signal, and a compensation circuit responsive to the power supply signal for controlling operation of the touch detector to prevent a false output signal in response to fluctuations in the power supply signal. The compensation arrangement may be embodied as a reference detector which provides a variable reference signal for the touch detector to compensate for power line fluctuations or which disables the touch detector output upon the occurrence of power line fluctuations.
280686
Hamilton William F.
Mitches & Co.
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