My monostable 555 timer circuit (like the one seen below from Electronic Tutorials) behaves as it should in a steady a steady-state environment.
However, the 555 timer is also undesirably triggered when the circuit is initially powered.
How can I prevent this unwanted startup activation?
Best Answer
Instead of simply tying the reset input directly to Vcc, add an R-C time delay that is significantly longer than the risetime of the supply voltage.