Universal Multi-Function Alarm and Timer(555)
Source: InternetPublisher:D先生 Keywords: Timing Circuit Updated: 2024/09/02
As shown in the figure, this is a universal multi-function alarm and timing circuit. The timing range of this circuit can be from 5 minutes to 3 hours. The timing components C2, VD1 and VT1 form the multiplier capacitor of the 555 circuit. The CK1 socket outputs a DC voltage of 6 to 9V on a regular basis, which can be used for timing work of radios, etc. Set K1 to the timing position, press AN, and the 555 pin ③ outputs a high level (6 to 9V), and VT2 is disconnected at the same time. When the timing time is up, the 555 pin 3 becomes a low level, CK1 has no voltage output, VT2 is turned on, and the alarm circuits of F1 and F2 generate a 20-second alarm sound and light alarms from F3 to F5. Various sensors can be connected to the A and B terminals to form additional sound and light alarm circuits.
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