Car power amplifier control by temperature change circuit

The utility model provides a car power amplifier control by temperature change circuit, includes: the fan, triode Q1, resistance R1, R2, R3, electric capacity C3, negative temperature coefficient thermistor TH1, the anodal electricity of fan is connected in negative temperature coefficient thermistor TH1, and negative temperature coefficient thermistor TH1's other end electricity is connected in triode Q1's base, and triode Q1's base is still established ties directly grounded after the resistance R2, triode Q1 collects electric connection in the negative pole of fan, the projecting pole establish ties in ground connection after the resistance R3, negative temperature coefficient thermistor TH1 changes self resistance according to the power amplifier temperature automatically, changes triode base voltage to the electric current that the messenger flowed through the fan changes, adjusts fan speed. This car power amplifier control by temperature change circuit can adjust fan speed automatically according to the power amplifier temperature, control power amplifier temperature, and the circuit is simple, and is reliable and stable, reduces the unnecessary fan speed noise generation.