Automatic Temperature Controlled Fan
Power supply Circuit:- The primary AC voltage is step down to 12 – 0 – 12 by using transformer X1 which further rectified using bridge rectifier (D1 through D4). The rectified output is filtered using capacitor and given to input pin 1 of voltage regulator IC 7812 (IC1). The regulated output is taken from pin 3 of IC1where pin 2 is grounded.
PARTS LIST
Resistors (all ¼-watt, ± 5% Carbon)
R1 = 100 KΩ
R2 = 56 KΩ
R3 = 39 KΩ
R4, R5, R6 = 1 KΩ
VR1, VR2 =
Capacitors
C1 = 1000 µF/40V
C2, C3 = 1000 µF/25V
C4 = 0.1 µF
Semiconductors
IC1 = LM7812 (12V regulator IC)
IC2 = LM324 (operational amplifier)
T1, T2 = SL100
D1 – D6 = 1N4001 (rectifier diode)
Miscellaneous
TT1 = AD590 (temperature transducer)
RL1, RL2 = 12V 200Ω
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