Thermal relay for hood

How to make an automatic hood? - It's not at all as difficult as it might seem. There are very different options, but I settled on something like a thermal relay. It will work like this: when someone cooks something on a gas or electric stove, then naturally heat will emanate from the fire and from the food and rise upward. The hood will heat up and, accordingly, the thermostat sensor will heat up, which in turn will turn on the hood.

I settled on a simple circuit with 2 transistors, using a Schmitt trigger as an example.



I assembled it using a homemade method.



There are also rectifier diodes and a capacitor on the board. The thermistor was taken from a broken air conditioner.
I connect it to the hood. The hood is 3-speed, I connect it to a single-speed gap.



Assembled and brought out the wires for the relay.



Connected to the circuit.



I supplied power to the circuit and adjusted everything. Next I insulated it and installed it in place.



I made a small hole in the grill for the sensor. It is barely visible in the photo.



Everything works without problems. And in addition there is a video about the thermostat.