The wide range timing switch circuit

Published:2011/6/25 1:39:00 Author:qqtang | Keyword: wide range, timing switch | From:SeekIC

The traditional mechanical timing switches have almost been replaced by electric timing switch, and they are often the integrated circuit with a few external elements, i.e the components can compose a timer whose range is from several ms to several years. In the figure, the circuit is fixed with the single chip time deliver circuit XR2242, the time ranges from several ms to several years. The circuit consists of a time-base oscillator, a 8-bit binary counter and a control trigger. The time-base circuit consists of the resistor R and capacitor R, which has 3 output pulse times, they are T=RC(8-pin), T=2RC(2-pin) and T=128(3-pin). By adding an external voltage, the output can be reset.



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