DRIVING A RELAY Circuit

Published:2013/3/4 21:44:00 Author:Ecco | Keyword: DRIVING A RELAY | From:SeekIC

The 555 will activate a relay. When pins 2 and 6 are connected as an input, the chip requires only about 1uA to activate the output. This is equivalent to a gain of about 200,000,000 (200 million) and represents about 4 stages of amplification via transistors.In the first circuit,the output will be opposite to the input. The relay can be connected high or low as show in the second diagram. One point to note: The input must be higher than 2/3V for the output to be low and below 1/3V for the output to be high. This is called HYSTERESIS and prevents any noise on the input creating relay chatter.



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