Automatic reset timer circuit
Source: InternetPublisher:子丑寅卯 Keywords: timer circuit power supply pulse network Updated: 2020/11/22
Shown is an automatic reset timer circuit . When the circuit is powered on, it will never produce output
pulses due to power surges , etc. This circuit is basically the same as a general monostable multivibrator circuit, except that an
RC network is added between pin ④ (reset terminal) and the power supply . After the power is turned on, the potential of pin ④ will not reach Vcc immediately. It needs to go through a delay of R3 and C3 network
, so
during this period of time, regardless of whether there is a trigger pulse on pin ② , the output of NE555 will remain low.
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