simple timer
Source: InternetPublisher:supremeOne Keywords: Power communication power Updated: 2021/02/27
Press S1 and the 100μF electrolytic capacitor quickly charges at approximately 0.7V. The transistor will be forward biased and collector current will flow through the relay. Let go of S1 and the capacitor will begin to discharge through the 33K resistor at the base of the transistor.
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