RS232 Voltage Regulator

There are many small applications where it would be preferable to power a device directly from an RS232 (V.24) interface, avoiding a mains power supply. Most ICs require 5 V, and the interface can provide a current of around 8 mA, almost all of which would be consumed by a readily-available voltage regulator, leaving nothing for the actual circuit.Using just four transistors we can construct a voltage regulator with current limiting which will allow us to draw more than the permitted 8 mA from an RS232 interface without damaging it.

Read More Source:
http://www.elektor.com/magazines/
2003/december/rs232-voltage-regulator.55465.lynkx

This entry was posted on Wednesday, November 7th, 2007 at 9:25 pm and is filed under Power supply, circuit com. You can follow any responses to this entry through the RSS 2.0 feed.