REF3030 is used as the reference voltage source, and kta2333 is used to build a reverse hysteresis comparator. The transistor drives the relay, and the freewheeling diode provides freewheeling to the relay.
Configure R2/R1=9, Vref=3V, Voff=12V, Von=10.125V.
LAYOUT is as follows:
It has been proofed and verified, and the function can be fully realized.
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