Circuit - Wireless Telephone Electronic Circuits Designed by David A. Johnson, P.E.

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Circuits designed by David Johnson, P.E.
Last Updated on: Thursday, March 22, 2012 05:46 AM

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Wireless Telephone Circuits

2.45GHz RF Signal Detector
This passive RF indicator is made from a few simple parts. A 100uA moving coil meter is used to display the relative intensity of the RF signal. This circuit can be used with some cell phones and many cordless telephones. (added 7/06)

Do It Yourself Portable Cell Phone Charger
It seems that as cell phones become more sophisticated, their operating times become shorter and shorter. If you are on the go all the time and have difficultly finding AC or DC outlets to charge your phone, you might consider this simple scheme

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