Relay circuit directly drived by the analog switch chip

Published:2011/7/8 5:55:00 Author:TaoXi | Keyword: Relay circuit, analog switch chip | From:SeekIC

The CD4066 is designed as one kind of quad two-way analog switch, the integrated blocks SCR1～SCR4 are the control ports. When the SCR1 is connected with the high level, the pin-1 and pin-2 of the integrated block conduct, the +12V voltage adds to the K1 to connect the pin-1 and pin-2 with the negative electrode of the power supply, so K1 closes; otherwise when the SCR1 is connected with the low level, the pin-1 and pin-2 of the integrated block are the open circuits, K1 releases, the states of the SCR2～SCR4 are the same as the state of the SCR1 when SCR2～SCR4 are connected with the high or low level. In this circuit, both ends of the relay coil are connected with the diode to protect the integrated circuit itself.



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