The frequency of the 555 is mentioned in post #6.I got a question for both of you.
The 555 timer timer should operate at what frequency, and how will the timer stop at 59m59s?
Is the circuit working on 5V?For now it is working on the transformer, full wave bridge rectifier with capacitor filter.
It is not an easy task to power the circuit, the display blinks with the voltage drop when lighting the cuicuit.
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