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Wireless Telephone Circuits
Last Updated on: Tuesday, August 18, 2015 06:50 AM


Circuits Designed by Dave Johnson, P.E. :

  • 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]


Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

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]

 

AN-42036/ PC b Grounding System & FAN2001/FAN2011 High Performance Dc-Dc Converters -  Fairchild App Note - . . . 

 

Analog Switch Applications in a MultiMode Cell Phone -  Application Brief # 028. . .  [Pericom Semiconductor]

 

Basic FlashLamp Illumination Circuitry for Cellular Telephones/Cameras -  DN345 Design Notes (Linear Technology). . .  [Linear Technology]

 

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 Detector aka Mobile Bug -  This handy mobile bug or cell phone detector, pocket-size mobile transmission detector or sniffer can sense the presence of an activated mobile cellphone from a distance of one and-a-half metres. So it can be used to prevent use of mobile phones in examination halls, confidential rooms, etc. It is also useful for detecting the. . .  [Circuit posted by Popescu Marian]

 

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]

 

Cellphone Operated Land Rover. Part 1. Schematic -  Conventionally, wireless-controlled robots use RF circuits, which have the drawbacks of limited working range, limited frequency range and limited control. Use of a mobile phone for robotic control can overcome these limitations. It. . .  Designer, Malik Zohaib]

 

Cellphone Operated Land Rover. Part 2. Software -  Part 1. Schematic Software description: The software is written in C language and compiled using CodeVision AVR C compiler. The source program is converted into hex code by the compiler. Burn this hex code. . .  Designer, Malik Zohaib]

 

Cellphone-Based Remote Controller for Water Pump -  Here we present a cellphone-based remote controller for water pump. By calling the cellphone attached to the controller, the water pump can be directly activated. . . .  [ EFY Enterprises Pvt. Ltd. All rights reserved.]

 

Cell-Phone-Controlled Audio/Video Mute Switch -  This cell-phone-controlled audio/video mute switch is highly useful in automobiles. The circuit auto-matically disconnects power supply to the audio/video system whenever the mobile handset is lifted off the holder for making or receiving calls. . .  [by T.K. HAREENDRAN]

 

Cellular Phone calling Detector -  Flashes a LED when detecting an incoming call; Powered by one 1. 5V cell. . .  [Flavio Dellepiane's web site]

 

Cellular Phone Helper -  When your cellular phone receives a call, it begins transmitting even before you answer. The circuit shown in fig. 1 detects this signal and can operate a variety of devices referred to as "load". . .  [Copyright 1998 Wenzel Associates, Inc.]

 

Cellular Telephone/Camera Flash Illumination -  AN95 Linear TechnologyThis publication concerns implementation of high quality "Flash" illumination in cellular telephones/cameras. Performance vs LED based illumination is discussed and flashlamp operation reviewed. Considerations for support circuitry are given, and a practical circuit, accompanied by performance data, . . .  [Linear Technology]

 

Circuitry for Cellular Telephone/Camera Flash Illumination -  AN95 Linear TechnologyThis publication concerns implementation of high quality "Flash" illumination in cellular telephones/cameras. Performance vs LED based illumination is discussed and flashlamp operation reviewed. Considerations for support circuitry are given, and a practical circuit, accompanied by performance data, . . .  [Linear Technology]

 

Converting Cellular Phones to 900 MHz -  Use old Motorola cellular phones as IF rigs in a 900 MHz transmitter. . . .  [Amateur Radio circuits from Green Bay Professional Packet Radio]

 

Cordless Phone Backup -  This is a circuit for a cordless phone backup unit that can be used to provide power supply to cordless phone at the time of main supply failure. A green LED indicates the presence of main supply and the circuit charges a rechargeable battery and puts the supply to cordless on battery in case of power failure. . . .  [ EFY Enterprises Pvt. Ltd. All rights reserved.]

 

Cordless phone backup -  . . . 

 

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]

 

DualVoltage Supply Powers SIM Card -  APPLICATION NOTE 1763: Global-system-for-mobile-communication phones have a subscriber-identification module (SIM) that allows local wireless providers to recognize the user and his or her billing information. Although most. . . 

 

Gel Cell Charger, II -  This circuit needs a regulated 10V-DC front end capable of supplying 2 Amps. Starts the charge cycle at 240mA and at full charge switches automatically to a float condition (trickle charge) of 12mA. . . .  [Tony van Roon's circuit]

 

GellCell Battery Charger -  circuit to charge a Gell Cell or other lead-acid type battery, includes sense circuit . . . 

 

Mobile Cellphone Charger -  . . . 

 

Mobile Phone Sniffer GSM Telephone Detector -  This handy, pocket-size mobile transmission detector or sniffer can sense the presence of an activated mobile cellphone from a distance of one and-a-half metres. So it can be used to prevent use of mobile phones in examination halls, confidential rooms, etc. It is also useful for detecting the use of mobile phone for spying. . .  [Circuit posted by Popescu Marian]

 

Mobile Phone TX Demo -  This is a very simple and cheap device that demonstrates mobile phones (US: 'cell phones') generate RF energy (radio waves) strong enough to light an LEDmust register on this site. . .  [Published in Elecktor July/Augu, 2010]

 

Mobile Solutions MP3 Cell phone PDA PMP -  Application Brief # 046. . .  [Pericom Semiconductor]

 

NiCd Cells Drives Op Amp -  12/05/96 EDN Design Idea   . Low-supply-voltage op Amps, such as the LMC6582 and LMC6681 families, feature rail-to-rail I/O with a gain-bandwidth product greater than 1 MHz operating from just 1. 8V. Although impressive, this voltage is not low enough to pow. . .  [by Alexander Belousov, Rego Park, NY]

 

PCB Grounding System & FAN2001/FAN2011 High Performance DC-DC Converters/AN-42036 -  Fairchild App Note - . . . 

 

PC's: not just another cell phone -  11/21/96 EDN Design FeatureLow-cost, high-functionality digital chip sets are becoming available for wireless base-station and terminal, or handset, applications, making personal communications service (PCS] affordable enough for mass-market deployment. . . .  [by Stephen Kempainen, Technical EDFtor]

 

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]

 

Simple Circuitry for Cellular Telephone/Camera Flash Illumination -  AN95 Linear TechnologyThis publication concerns implementation of high quality "Flash" illumination in cellular telephones/cameras. Performance vs LED based illumination is discussed and flashlamp operation reviewed. Considerations for support circuitry are given, and a practical circuit, accompanied by performance data, . . .  [Linear Technology]

 

Single NiCd Cells Drives Op Amp -  12/05/96 EDN Design Idea   . Low-supply-voltage op Amps, such as the LMC6582 and LMC6681 families, feature rail-to-rail I/O with a gain-bandwidth product greater than 1 MHz operating from just 1. 8V. Although impressive, this voltage is not low enough to pow. . .  [by Alexander Belousov, Rego Park, NY]

 

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]

 

The Phone Catcher -  I have had and used other devices that detect radio signals for years, so I have seen my telephone emitting signals at times other than those at which I was using it to talk with somebody. This Cell Phone Catcher lights an LED indicator light and whenever the phone transmits, so even the briefest of transmission can be seen. The LED stays on until press the RESET button. . . .  [From Dick Cappels' project pages]

 

Tiny Efficient High Power LED Camera Flash Solutions for Cell Phone Applications -   Design Note 1009. . .  [Linear Technology]

 

UPS for Cordless Telephones -  This is a circuit that acts as a UPS for cordless phones so that they can work even in case of a power failure. When the supply is on the circuit charges the battery of UPS and in case of power failure the circuit supplies power to cordless phone from battery. . . .  [ EFY Enterprises Pvt. Ltd. All rights reserved.]


Wireless Telephone Circuits


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