My Circuit

This cell phone detector circuit can sense the presence of an activated mobile cell phone from a distance of one and-a-half meters. If a RF signal is detected the circuit will inform you using a sound alarm (beep sound ) and a blinking LED . In this type of circuit (that use high frequency 0.9-3Ghz ) you can not use an LC circuit for frequency tuning  . The circuit uses a 0.22μF disk capacitor (C3) to according the RF circuit to ensure the capability of the circuit to capture the mobile phone signal . This cellular phone detector can detect any activity of a mobile phone : incoming or outgoing SMS , video transmission or voice transmission . The C3 capacitor must have leads length of 18 mm with 8 mm spacing between leads to obtain the desired frequency .  This small disk capacitor acts as a small gigahertz loop antenna to collect the RF signals  . The CA3130 operational amplifier IC is used as a current to voltage converter . This cellular phone detector electronic circ...

Normally cell batteries have a shelf life of 2 to 5 years under normal use . After that time we have to replace them . Nowadays there replacement batteries which are cheap, but these batteries last for much less cost only months. An easy solution is to use batteries in a circuit that requires less current , we can use them for lighting LEDs .  How to Reuse Old Cell Battery for LED lighting 

Many modern electronic devices and micro-controller based circuits need a 5 V or 3.3 V power  supply. It is important  that  these voltages are constant and so a regulator of some kind is essential, including in battery powered devices. The simplest approach is to select a (perhaps rechargeable) battery whose voltage is rather higher than that required by the circuit and use an ordinary  linear voltage regulator. Unfortunately this solution is rather wasteful of precious energy and space: for a 5 V circuit at least six NiCd or NiMH cells would be required. Both these disadvantages can be tackled using a little modern electronics. A good way to minimise energy losses is to use a switching regulator, and if we use a regulator with a step-up topology then we can simultaneously reduce the number of cells needed to power the circuit. Fortunately it is not too difficult to design a step-up converter suitable for use in portable equipment as the semi-conductor manufacturers...

This is very interesting electronic project for gsm jammer. A wonderful diy gsm jammer or cellular mobile phone jammer schematic diagram for use only in GSM1900 with frequency from 1930 MHz to 1990 MHz. Gsm Cell Phone Jammer Circuit Diagram: The GSM1900 cellular cell phone network is made use of by USA, Canada and most of the nations in South America. This cellular phone jammer isn`t applicable for use in Europe, Center East, nor Asia. The GSM jammer circuit could block mobile mobile phone signals which operates on GSM1900 band, also identified as DCS.

HTC introduced its new HTC One cell E8, the version of HTC One M8 made of plastic if you are looking to reduce cost with this item, but keeping features or high end specs that allow you to compete on equal terms with the Samsung Galaxy S5 . The cell that had been known as HTC Ace One M8 features a 13-inch camera, instead of having two cameras on the back. The HTC One E8 essentially maintains the same dimensions of the HTC One M8, but redice weight 15 grams with its new material. The HTC One E8 has a Full HD (1080p) 5.1 inch screen, a quad-core 2.5GHz Snapdragon processor 801, 2GHz of RAM and 16GB of storage with support for microSD card up to 128GB. While the rear camera has 13 megapixel, Front Camera maintains its 5 megapixel camera, 2,600 mAh battery and Android 4.4 KitKat. Similarly, the HTC One BoomSound E8 has the speakers and features HTC Sense custom interface 6. For now, the HTC One E8 is sold only in China, but there is a possibility to expand to other markets. Its c...