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Circuits designed by David Johnson, P.E.
Last Updated on: Monday, July 11, 2016 01:59 PM

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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 . . . [Circuit by David Johnson P.E.,  07/09/06]


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 difficulty finding AC or DC outlets to charge your phone, you might consider this simple scheme . . . [Hobby Circuit designed by David A. Johnson P.E.,  08/24/09]

Cell Phone Solar Powered Charger  -  The simple circuit below regulates the voltage from a 6v solar panel to a fixed +5v.  That voltage can be fed to any cell phone or USB connected portable device, to charge its battery.  The circuit uses a Reg113-5 voltage regulator from Texas Instruments . . . [Hobby Circuit designed by David A. Johnson P.E.,  01/02/11]


Display RF Signal Strength  -  Many cordless telephones, computer networks and cell phones use a RF transmitter lefted on the 2.45GHz band.  Using a microwave diode detector and 100uA meter, this passive circuit will display the strength this signal.  The drawing shows how a bent piece of wire can be used as the antenna. . . . [Hobby Circuit designed by David Johnson P.E.,  07/09/06]


DIY 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 difficulty finding AC or DC outlets to charge your phone, you might consider this simple scheme . . . [Hobby Circuit designed by David Johnson P.E.,  08/24/09]


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 difficulty finding AC or DC outlets to charge your phone, you might consider this simple scheme . . . [Circuit by Dave Johnson P.E.,  08/24/09]


RF 2.45Ghz 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 . . . [Hobby Circuit designed by Dave Johnson P.E.,  07/09/06]


RF Signal Detector at 2.45GHz  -  Many cordless telephones, computer networks and cell phones use a RF transmitter lefted on the 2.45GHz band.  Using a microwave diode detector and 100uA meter, this passive circuit will display the strength this signal.  The drawing shows how a bent piece of wire can be used as the antenna. . . . [Hobby Circuit designed by Dave Johnson P.E.,  07/09/06]


Solar Powered Cell Phone Charger  -  The simple circuit below regulates the voltage from a 6v solar panel to a fixed +5v.  That voltage can be fed to any cell phone or USB connected portable device, to charge its battery.  The circuit uses a Reg113-5 voltage regulator from Texas Instruments . . . [Circuit by David A. Johnson P.E.,  01/02/11]

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