Zener diode ZD1 senses the supply, and should the supply rise above
6 V, Ql will turn on. In turn, Q2 conducts clamping the rail.
Subsequent events depend on the source supply. It will either shut down,
go into current limit or blow its supply fuse. None of these will
damage the TTL chips. The rating of Q2 depends on the source supply, and whether it will
be required to operate continuously in the event of failure. Its current
rating has to be in excess of the source supply.
Over voltage protection for logic Circuit Diagram
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