Simple timing control circuit

Shown is a simple timing circuit, which mainly consists of a 14-bit binary serial counter, frequency dividing integrated circuit and power supply circuit
. The ICI internal circuit and peripheral components R4, Rs, RP1 and C4 form an RC oscillation circuit.
    When the oscillation signal is divided by 14 levels by two inside IC1, the @ pin of IC1 outputs a signal divided by 8192 (213) times, that is to say.
If the oscillation period is n and the ③ pin output of IC1 is used for delay, the delay time can reach 81 92 71. Adjusting RP1 can make r change, thus achieving
the purpose of adjusting the timing time.
    When starting up, capacitor C3 clears IC1, and then IC1 starts timing. After 8192T time, IC1 pin ③ outputs a high-level pulse
signal , which turns vri on and VT2 off. At this time, relay Kl stops working due to loss of power. The contact plays the role of timing control.
    S1 in the circuit is the reset switch. If you want to stop the timing halfway , just press Sl. Then ICl will be reset, the counter will
start timing again, and resistor R2 will provide a discharge circuit for c3.