Automatic timing controller circuit

RF cable can be customized for other specifications

As shown in the figure is an automatic timing control circuit. The circuit is composed of an electronic watch, a detection circuit (C1, D1), an amplifying circuit, a monostable multiplication delay circuit (555, W2, C6, BG3), a relay J, and the like. The timing signal source is taken from the last C segment of the electronic watch.
When the last bit P of the electronic watch becomes R, the voltage amplitude of the C segment is increased to 3V, the signal is detected by D1 and C1, and amplified by BG1 and BG2 and added to the 5552 pin to trigger the 555 circuit to work. When the negative pulse of BG2 arrives, the monostable multiplication delay circuit is inverted, the 3-pin output is high level, and the monostable transient stabilization time is td=1.1Rw2C6β, where β is the current amplification factor of BG3. If Lu takes 100, the temporary stability delay can be up to 2 hours.
The circuit's timing range is from 1 minute to 24 hours, and the delay range is from 1 second to 2 hours. It can be used for automatic timing on and off of home appliances. If the preset time is up, it will automatically turn off. If the timing range is within 12 hours, the preset time ("P" display) is 12-predetermined time; if the timing range is greater than 12 hours, the preset time ("R" display) is 24-predetermined time.