Frost AlarmCircuit Project

Posted on Feb 4, 2014

The thermistor used has a resistance of 15k at 25 degrees and 45k at 0 degrees celsius. A suitable bead type thermistor is found in the Maplin catalogue. The 100k pot allows this circuit to trigger over a wide range of temperatures. A slight amount of hysteresis is provided by inclusion of the 270k resistor. This prevents relay chatter when temper

Frost AlarmCircuit Project
Click here to download the full size of the above Circuit.

ature is near the switching threshold of this circuit.

Leave Comment

characters left:

Related Circuits

  • New Circuits



    Popular Circuits

    Turn an old PC into a multi-channel pulse generator, for PWM/servo/stepper
    Two channel frequency synthesizer
    Low-Distortion Amplifier/Compressor
    LCD thermometer
    Arduino Serial Call Response
    White led driver
    Noise Suppression For R/C Receivers
    Infrared Alarm Barrier Circuit
    1W Long Range FM Transmitter
    mp3 mode circuit wtv020sd 16p tutoria
    reservoir pump controller
    555 double coil metal detectors
    DAC0832 interface circuit with the 8-bit CPU