Fish tank intermittent oxygenation timer circuit

1) Introduction to circuit principle The circuit is shown in Figure 3-33. CMOS integrated circuit CD4060 is a 14-bit binary serial counter . It has its own
oscillator and has 14 counting stages. However, it only has 10 terminals Q4~010 and Q12-Q14. Only three oi2~014 are selected for this part.
Lead terminal.
    Turn on the power supply, and add the 9V power supply to the counter clearing terminal @ pin through G. At this time, the counter is cleared and starts counting, and the clock frequency is 1Hz. The status of
counter switches Kl, K2, K3 and K4 is shown in item A in Table 3-1. When K2 is closed and Q13 is high level, the thyristor VT1 is triggered to conduct
and the relay is turned on; when K4 is closed, Q12 is high level. Normally, BG1 is cut off and the relay is released;
when the next counting pulse reaches Q12, Q12 and Q13 return to the initial state "O". This process cycle makes the ratio of the relay's opening and closing time to 3:1. The timing time ratio of other states
is shown in Table 3-1. In this way, with the switching of the socket, a variety of different timing and interval ratios can be obtained. With the adjustment of RP, various
requirements for fish tank oxygenation can be met.
    (2) Component parameters are selected. The relay is selected as a 9V small relay
JRC-22F9V, etc., and the transformer is selected as a small power transformer with a secondary output of 9V . The selection of other components is shown in Figure 3-33, and there are no special requirements.
    (3) The fish tank intermittent oxygenation timer circuit is shown in Figure 3-33.