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Electric home appliances

  • US 4,276,468 A
  • Filed: 07/20/1978
  • Issued: 06/30/1981
  • Est. Priority Date: 07/27/1977
  • Status: Expired due to Term
First Claim
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1. An electric home appliance incorporating a control system comprising sensor means having an impedance value variable with variations in temperature, humidity or other state;

  • a control circuit connected to the sensor means and including oscillator means, counter means for counting the number of oscillating output pulses from the oscillator means, and means for determining gating time for the counter means;

    characterized in that the oscillator means has an oscillation frequency directly defined by the impedance value of the sensor means, the oscillator means having an oscillation time constant determined by a plurality of impedance elements independent of the electric impedance of the sensor means, and change-over switch means for selectively connecting said independent impedance elements to the oscillator means.

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