Basic bang bang heating configuration. Setpoint thermistor resistance = RB/2. Optional RH sets desired temperature hysteresis. Output rated at up to 15 volts and 300 mA = 4.5 W
Figure 1. Basic bang bang heating configuration. Setpoint thermistor resistance = RB/2. Optional RH sets desired temperature hysteresis. Output rated at up to 15 volts and 300 mA = 4.5 W