With the help of this electronic device, you can monitor the speed or stop of the fan-cooler. If the speed starts to decrease or the cooler stops, a beep will signal this
The 555 chip is used to assemble a device that powers the buzzer and controls the signal at pins 2 and 6. When power is supplied to the fan, a pulse current flows through its wires. These pulses can be “caught” and converted into a pulse voltage using an inductor coil used in the relay. 4-5 turns of the fan power wire must be wound onto this coil. If the device does not work, the wire should be wound in a different direction.The buzzer must have a sound generator (inside the case).
The signal that will be after the transistor coming to pins 2-6 of the microcircuit looks like a saw with an amplitude of 6.8V
When the fan-cooler speed decreases, the signal amplitude begins to increase and the buzzer begins to emit an intermittent, low-volume sound.When the fan stops, the voltage at pins 2 and 6 of the microcircuit will be 8.4 V, and the buzzer will make a loud monotonous loud sound.
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