fan regulator using diac and triac or scr
#1

Hi am Mohamed i would like to get details on fan regulator using diac and triac or scr ..My friend Justin said fan regulator using diac and triac or scr will be available here and now i am living at ......... and i last studied in the college/school ......... and now am doing ....i need help on ......etc
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#2
Working


The supply of 230V 50Hz is lowered first to 9V by the transformer and rectified by the rectifier bridge. This is given to the pin2 (inverting input) of the 741 op-amp. A The constant voltage obtained by adjusting the 30K ohm potentiometer connected to 12V in a voltage divider with 10K ohm is given to the pin 3 (non-inverting input) of the operational amplifier 741. The operational amplifier is configured as a differential amplifier with gain 10. The Output of the difference amplifier is given to the trigger pin (pin 2) of the timer 555 configured in monostable mode with a pulse width of 2.2 ms. When the rectified down-wave is below the voltage given at pin 3, the operational amplifier gives a high voltage and when the voltage at pin2 exceeds the constant voltage given at pin 3, then the output goes down, activating the monostable multivibrator To give a pulse of constant duration of 2.2ms. To operate with 230V supply, the 4N25 optocoupler is used for the interface with the TRIAC gate. This is to protect the rest of the circuit by coming into direct contact with the 230V supply. The optocoupler causes the TRIAC gate pin to be high for a short time. This impulse triggers the TRIAC and causes it to drive. This way you can modulate the AC wave pulse width through the fan and control the fan speed. SW switch can be used to turn the fan on / off.

Pulse width = 1.1 R1 * C1 = 1.1 * 2K * 1uF = 2.2msec.

The bottom figure in the picture is the circuit for deriving the 12 volt source.
Speed regulator
As the potentiometer (Variable Resistor VR1 10K ohm) is set, the fan speed changes. The upshift potentiometer increases fan speed.

For zero fan speed, the potentiometer must be fully slid up, and the voltage at pin 3 will be 12 * (31/31 + 10) = 9.073 V, the opamp output is always high. For maximum fan speed, slide the potentiometer all the way up. The voltage at pin 3 will be 12 * (1/10 + 1) = 1.09 V. As the potentiometer slides upwards, the voltage at pin 3 is reduced and for each cycle the opamp is lowered in a short time And this triggers the timer 555, which triggers the TRIAC. In conventional fans, fan speeds can be only at discrete levels, as the regulator knob is turned; This fan controlled by TRIAC can vary the fan speed continuously.

The circuitry does not use controllers and different ventilation speeds can be obtained compared to the discrete levels of speed of existing ceiling fans.
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