Circuit which is also equipped with temperature sensors would protect the high temperature. However, in the above circuit which necessiatated the input of the amplifier / audio signal. The way it works is , if the amplifier circuit to work and ouput signal to be connected to this circuit , Fan 12V will work well. If the received audio signal this circuit does not exist , then the fan 12V die. And automatic circuit amplifier also not work and does not require refrigeration.
R1_________________220K
R2,R9,R10,12,13_____100K
R3_________________2K4
R4_________________22K
R5_________________1M
R6_________________150R
R7_________________2K2
R8_________________33R 4W
R11________________10K
C1_________________100pF
C2_________________47uF 25V
C3_________________100uF 25V
D1,D2______________1N4148
Q1_________________MJE350
Q2_________________MPSA42
IC1________________7915
IC2________________LM35
F1_________________Fan 12 Volt
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