Fan stopped when no audio input

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.

Part List :
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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