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Remote control circuit

  • US 4,375,106 A
  • Filed: 12/11/1980
  • Issued: 02/22/1983
  • Est. Priority Date: 12/22/1979
  • Status: Expired due to Term
First Claim
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1. A remote control circuit for controlling one or more functions in a device, said circuit comprising a transmitter for transmitting control signal pulses and a receiver for receiving and evaluating said pulses, wherein the transmitter comprises(a) a monostable multivibrator for generating a cyclically repetitive train of pulses at determinable intervals and comprising two complementary transistors and a resistive-capacitive coupling, the collector of a first one of said of transistors being connected to the base of the second one of said transistors and the collector of said second transistor being coupled to the base of said first transistor by way of said resistive-capacitive coupling;

  • (b) switching means;

    (c) pulse interval determining means for determining different pulse intervals for said train and corresponding in number to the number of said functions and controllable by said switching means to cause a control signal pulse transmission of the transmitter to have a selected one of said intervals; and

    (d) signal pulse transmitting means connected to the collector of said second transistor to provide a control signal pulse transmission with the selected pulse interval; and

    wherein the receiver comprises(a) signal pulse receiving means for receiving signal pulse transmissions from said signal pulse transmitting means;

    (b) a resistor-capacitor charging circuit in which the capacitor is so chargeable via the resistor and dischargeable by each pulse of a received signal pulse transmission as to provide an output sawtooth voltage having a peak magnitude dependent on the selected pulse interval;

    (c) a filter stage connected to said resistor-capacitor charging circuit to filter said output voltage thereof; and

    (d) a voltage level detecting stage connected to said filter stage to detect the level of the voltage filtered by said stage and to control a respective function of said device which is associated with the detected voltage level.

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