Circuit Project Electronic

The 74C14/40106 schmitt trigger inverter is powered through a 78L05 +5v series regulator.
so that the input switching points remain constant regardless of the input voltage. A schmitt trigger input typically switches ON at 2/3rds the supply voltage, and OFF at 1/3rd the supply voltage. For a 5v supply the on and off points are about 3.2v and 1.6v respectively. This wide “window” does cause some problems because the output needs to swing between these two voltages. The 1N4001 diode provides isolation from the regulator and the 4700uF capacitor provides smoothing to closely approximate a steady DC voltage. In practice the +/- 0.8v ripple is smoothed by the 4700uF capacitor, but under heavy loading this ripple will become apparent.

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Read More at http://www.rowan.sensation.net.au/electronics/stepdown.html

This entry was posted on Monday, July 9th, 2007 at 9:46 pm and is filed under Power supply, switching power supply. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.