Light control of the exhaust fan. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Miscellaneous electrical devices
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In order for the exhaust fan in the toilet to turn on when the light is turned on, and turn off after the light is turned off, you can redo the wiring and connect the fan in parallel with the lamp. But, if this is undesirable (for structural and aesthetic reasons), you can install an optical sensor in the fan that will turn it on after turning on the light in the toilet, and turn it off after turning off the light in the toilet.
The circuit is shown in the figure. FT1 is a phototransistor from an old ball computer mouse.
The sensitivity is set by selecting the resistance R1.
When it is dark, FT1 is closed and there is no voltage on the gates VT1 and VT2, they are closed, and the fan is turned off. When the light is turned on, FT1 opens abruptly and supplies voltage to the gates VT1 and VT2. They open and turn on the fan.
Literature
- Radioconstructor 2011 №7
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