Silent timer reminder circuit
Source: InternetPublisher:国民男神经 Keywords: Reminder Updated: 2021/02/14
Circuit working principle: After the power switch is turned on, the circuit automatically resets its operation so that each
IC is in its initial state. The reference signal generating circuit 8651B generates a 1/60 Hz signal
, which is input to the reverse counting terminal of the counter 74 HC 192. 74 HC 192 is a 4-bit forward and reverse counter that can be preset.
By changing the IC input, it can be
used as a forward or reverse counter.
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