Heater blower with selector wheel
The blower output can be set infinitely variable via a rotary switch.
The blower motor is controlled by a linear blower output stage. The blower control voltage is generated with a PWM signal and ranges from approx. 1.5 V at minimum stage to 8.0 V at maximum stage. The blower is switched off at a blower control voltage below 0.5 Volt.