Cooling configuration: Setpoint thermistor resistance = 2R_B

Authors	Stephen Woodward
Main Document	Article «LM555 begets basic bang bang thermostat»
Description	Figure 2
File Format / Size	PDF / 14 Kb
Document Language	English

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Article «LM555 begets basic bang bang thermostat»

Figure 1. Basic bang bang heating configuration. Setpoint thermistor resistance = R_B/2. Optional R_H sets desired temperature hysteresis. Output rated at up to 15 volts and 300 mA = 4.5 W
Figure 2. Cooling configuration: Setpoint thermistor resistance = 2R_B
Figure 3. Typical configurations for 50 °C setpoint. Heating (left), Cooling (right) with ~1° hysteresis

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