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Probe domestic switch needle KG300B head diameter 3.0 normally closed switch needle total length is 5
An increase in the value of R2 or C1 will lower the oscillator frequency. Conversely, a decrease in the value of one of R2 or C1 will increase the frequency. The integrated circuit output on pin 3 can drive the LED through R3 to deliver power to the pressure generator. In this way, the brightness of the LED can be seen even during the day.
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