Mutchus

This is a circuit for emergency lighting with LEDs that uses electricity from the telephone line . Generally the phone line has a DC voltage 48V and somewhere around 20 mA , and when the phone rings , the voltage rises to 96V AC . This works in a way that the phone line will not be busy while the LEDs are turned on and when you pick up the phone , the light goes off and lets you use your phone normally .  Emergency Light using Phone Line Circuit Diagram

Joe Collier and Kai Wei Tang created a concept cell phone Light Phone size of a credit card, which is connected to the main cell phone and has only the function calls. 

Circuit showing a mobile phone jammer .Here i have used a fm transistor for making this circuit.Mobile phones are working in 450 MHz frequency .Here the transmitter generate almost equal to 450 MHz frequency there for the mobile phone does not identify the original signal but the signal range is very week so this circuit working in only 100 m range .This circuit working in only 450 Mhz .Do not give more than 3 V Circuit Diagram   Part List Component No: Value  Usage R1  100R   Emitter loading R2  39k    Base Biasing C1 15 pf   Frequency  Generating C2 4.7pf   Feedback C3  4.7pf   Feedback C4 102pf   Noise Reduce C5  1MF Coupling C6  2.2pf   Coupling C7     103pf    Decoupling  Q1  BF 494   Amplification L1  22nH  Frequency  Generating Applications * FM Transmission * TV Transmission * Remote Controlled T...

  This cell phone jammer operates at GSM800 frequency since most mobile phones use it to operate. So the selected VCO is a sweeping oscillator, which is very effective but may be hard to construct for the beginners without nice RF-testing equipment. As a noise source you can use 45MHz clock oscillator which is driving Local Oscillator port located on a mini-circuit mixer. There is also an impedance matching network for Local Oscillator signal to pass through it. It is used to equate impedances of the clock oscillator and the port of the mixer. RF input (which is this port of the mixer) connected to the first 800MHz cell phone antenna, and the RF output is sent to the mini-circuit amplifier. This amplifier increases the output power for 15-16dbm. The amplified signal then sent to the second cell phone antenna.  works All cell phones which use GSM800 have their transmitted and received frequencies always separated by 45MHz. So when the mobile phone tries to call it is blocked b...

Nokia has started rolling out its Windows Phone 8 'Amber' update for its Lumia smartphone lineup, which brings with it a number of major software improvements. Nokia's Amber update builds on Microsoft's most recent Windows Phone 8 update and sees the Finnish firm further outdoing HTC and Samsung with unique Windows Phone features. The most notable new aspect is Amber's added camera features. The update adds Nokia's Pro camera app that debuts on the Lumia 1020 to some of its older phones, including the Lumia 920 and Lumia 925. Nokia's Smart Camera app is also made available to more devices, as the Amber update sees the app arriving in the Windows Store. Detailing the Smart Camera app on its blog, Nokia said, "The app brings a slew of different options – use Best Shot to find the sharpest image from a series of ten; combine several shots of people in movement into one with Action Shot; heighten the appearance of speed by blurring the background with Motio...

When the ADSL and PSTN works on the same line at the same time, a problem the electronics in a normal telephone for high frequency signals ADSL: ADSL signals can be reduced (with high capacity intercom can be resonances in the phone, impedance mismatch ) and ADSL signals can be heard as the sound on some phones (electronic phone demodulates RF signal is out of range voting frequency noise). Just to keep these systems and stop interfering with each other, it is necessary for the two components of the telephone in your home to separate. ADSL and DSL Inline Phone Filter Circuit diagram This is where the filter / splitter comes in. The ADSL POTS splitter / filter allows you to take full advantage of the frequency 1.1 MHz copper line to take, stopping the ADSL and phone systems interfere with each others. An ADSL filter is normally a small plastic box with a short cable that connects to your telephone jack and two outputs, one for your ADSL modem and a telephone. Some filters have an exit b...