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Cumulative timer circuit diagram

2014-11-23 06:23  
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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 1N4l48 or 2CK44A silicon switching diode. V1 and V2 use S9013 or 3DG6 silicon NPN transistors. Digital watchesse use the multi-function LCD digital watches.