Actuation Delaying Relay Circuit

Published:2011/4/25 23:55:00 Author:Joyce | Keyword: Actuation Delaying, Relay | From:SeekIC

If a delay circuit which is long-lasting and easy to adjust is wanted , then the relay current should be controlled by the transistor, and a RC link should be connected to the basic circuit, as shown in the figure. If power supply voltage, capacitance C, current amplification factor β and the required operation power are known, you should choose the appropriate relay coil resistance and working voltage values, so that delay time could be as long as possible. The length of time can be determined by calculating the time constant :



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