Transistor Relay Time-Delay Closing Circuit

Published:2011/7/17 0:56:00 Author:Robert | Keyword: Transistor, Relay, Time-Delay, Closing | From:SeekIC

The picture shows the transistor relay time-delay closing circuit. When it is connected to the power supply, the voltage on the 16uF capacitor would be 0V and the two triodes are all off and the relay has no action. As the 16uF capacitor charging, after some time, the voltage on it would get to high voltage level and the two triodes are all turned on and the relay would be closed after the delay time. The delay time could be 60s. The length of delay time can be adjusted by the 10MΩ resistor.



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