Fan control temperature using sensor LM35

Basic circuit of the LM35 are made to control the fan is either used on amplifier that requires automatic cooling. Its use on power amplifier circuit above and only requires DC fan. From basic sensors based on ic and amplifier op-amp is added again to the transistor Q1 to drive the fan.

Part List :
R1___220K
R2___100K
R3___3K3
R4___22K
R5___1M
R6___150R
R7___2K2
R8___33R 4W
C1___100pF
D1___1N4148
IC1__7915
IC2__TL072
IC3__LM35
F1___DC Fan 12V