Saturday, August 1, 2015

Circuit Schematic Temperature Controlled Fan Regulator based on Triac BT136

Eltronicschool. - Do you want to make your self temperature controlled fan regulator based on Triac? circuit schematic like in figure 1 below show you Temperature Controlled Fan Regulator based on Triac BT136.

Circuit Schematic

Figure 1. Circuit Schematic Temperature Controlled Fan Regulator based on Triac BT136 (Circuitstoday)

Component Part
  1. Fan Motor
  2. C3 = 0.05 uF
  3. L1 = 700 uH
  4. R1 = NTC 100K
  5. R2 = PTC 5K
  6. C1 = 0.1 uF
  7. C2 = 0.1 uF
  8. T2 = DB2
  9. T1 = BT136

Description

Circuit schematic like in figure 1 above is Circuit Schematic Temperature Controlled Fan Regulator based on Triac BT136. According Circuitstoday site describe that this fan regulator circuit will automatically control the speed of your fan according to the temperature. Two thermistors (R1 and R2) are used to sense the temperature. The circuit works almost like the published here previously. Here the potentiometer is replaced by the thermistors. 

When the temperature is increasing the resistance of NTC thermistor ( R1) decreases and at the same time the resistance of PTC thermistor (R2) increases. At the same time, rate of change of the resistance will be different for R1 and R2.This action is similar to a potentiometer used in a conventional Triac based fan regulator. When the resistance is varied the firing angle of the triac changes and so do the speed of the fan.


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