Cumulative timer circuit diagram

The cumulative timer circuit consists of resistor R1 and spreadsheet internal crystal oscillator BC, and it is shown as the chart. R1 and R2 choose the metal film resistors: R3 ~ R5 select the 1/8W metal film resistors. C select the aluminum electrolytic capacitor with voltage being above 10V. VD1 ~ VD4 use the 1N4007 silicon rectifier diodes; VD5 uses the 1..

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