Temperature control circuit composed of NE555

Published:2011/8/26 2:22:00 Author:Jessie | Keyword: Temperature control | From:SeekIC

Temperature control circuit is composedof thermistors Rt1, Rt2, NE555 time-based circuit, temperature range adjust resistanceRP1, RP2and control execution organization. Rt1、RP1 are higher limit temperature testing resistors while Rt2、RP2 are lower limit temperature testing resistors. When the temperature drops, potential of pin 2 is below 1/3Vcc, pin 3 outputs high level, J suck closes, LED2 islit, then the circuitbegins heating. When the temperature rises, potential of pin 2 is higher than 1/3Vcc, pin 3 outputs low level, J releases, then it stops heating. The thermostat has the features of wide applications, high accuracy, low cost, easy to install.



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