delay relay circuit composed by LM122

Published:2011/7/26 9:18:00 Author:Nancy | Keyword: delay relay | From:SeekIC

Figure 1 is the delay relay circuit composed by LM122. The LM122 is a timer integrated circuit from microsecond to hour level with a constant voltage circuit inside, so the timing is not effected by the change of the supply voltage, the output current is 50 mA and the working voltage is from 4.5 to 40 V. The Figure 1 (a) is a relay K energization circuit after the RtCt timing. When the relay loses electric, the external voltage +Ucc is off. The Figure 1 (b) shows that the relay K conducts and works with external voltage +Ucc and disconnects after the RtCt timing. The relay is off when you cut off the power again until the next operation.



Reprinted Url Of This Article:
http://www.seekic.com/circuit_diagram/Basic_Circuit/delay_relay_circuit_composed_by_LM122.html

Print this Page | Comments | Reading(3)