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Cellphone battery charging process when we're done traveling is a big problem. Because when traveling source of power supply is generally difficult to find. If you turn on your phone then the battery continuously over time will run out within a period of five to six hours and eventually mobile phones unusable. Here is described a series of simple charger that will increase battery life two to three hours. In principle, the charger uses a series of Limited Voltage Current Source. Generally requires cellphone battery voltage 3.6 - 6 volts DC and currents 180-200 mA to perform the charging process. Cellphone battery usually consists of three NiCd battery cells, and each cell has a voltage of 1.2 volts potential. At the speed - average low flows required to charge mobile phone battery about - about 100mA. In this series there is a 12V voltage source consists of 8 regular battery cells (each cell 1.5 Volt) able to supply current at 1.8 A which is connected with output terminals. The cir...

While travelling charging of mobile battery is great problem because power supply source is not generally accessible. Here is a simple project using very common electronics components for charging mobile battery using AA cells. Circuit descriptions of mobile cellphone charger The main part of the circuit mobile cellphone charger is timer IC NE555, used to charge and monitor the voltage level. IC 1 get control voltage to pin 5 by zener diode ZD 1 ­. Threshold pin 6 and trigger pin 2 is supplied with a voltage set by VR 1 and VR 2 respectively. The trigger pin 2 of IC 1 is below 1/3V CC when discharge battery is connected to the circuit as a result flip-flop of IC 1 is switched on to take output pin 3 high. The process is reversed when battery is fully charged of charged battery is connected. Here transistor T 1 used to enhance the charging current from output pin 3 of IC 1 . Adjust potentiometer VR 1 and VR 2 as per require. LED status for different charging conditions Load acr...

Using a mobile phone while driving is dangerous. It is also against the law. However, you can use your mobile phone as a powerful music player with the help of a stereo power amplifier. This does away with the need of a sophisticated in-dash car music system. Most mobile phones have a music player that offers a number of features including preset/manual sound equalisers. They have standard 3.5mm stereo sockets that allow music to be played through standard stereo headphones/sound amplifiers. Nokia 2700 classic is an example. A car audio amplifier with 3.5mm socket can be designed and simply connected to the mobile phone output via a shielded cable with suitable connectors/jacks (readymade 3.5mm male-to-male connector cable is a good alternative). Fig. 1 shows the circuit of car stereo player. It is built around popular single-chip audio power amplifier TDA1554Q (IC1). The TDA1554Q is an integrated class-B power amplifier in a 17-lead single-in-line (SIL) plastic power package. . Fig. 1...

Description The main part of the circuit mobile cellphone charger is timer IC NE555, used to charge and monitor the voltage level. IC1 get control voltage to pin 5 by zener diode ZD1­. Threshold pin 6 and trigger pin 2 is supplied with a voltage set by VR1 and VR2 respectively. The trigger pin 2 of IC1 is below 1/3VCC when discharge battery is connected to the circuit as a result flip-flop of IC1 is switched on to take output pin 3 high. The process is reversed when battery is fully charged of charged battery is connected. Here transistor T1 used to enhance the charging current from output pin 3 of IC1. Adjust potentiometer VR1 and VR2 as per require. LED status for different charging conditions Load across the output Output frequency (at pin 3) LED 1 No battery connected 765 kHz On Charging battery 4.5 Hz Blink Fully charged battery 0 Off Circuit Diagram Parts Resistors (all ¼-watt, ± 5% Carbon) R1 = 390 Ω R2 = 680 Ω R 3 = 39 Ω/1W R 4 = 27 KΩ R 5 = 47 KΩ R 6 = 3.3 KΩ R 7 = 100 Ω/...

Trick jumper switches on the mobile phone antenna this will affect the capability dual-band mobile phone into one band only, ie 900 MHz. This trick is very useful to get around the limitations of funds. If you do not want to lose the ability to dual-band mobile phone into one band only, then the alternative is to make the turn with a new IC PA. ANTENNA JUMPER DIAGRAM MMI strives to provide complete and accurate information, but MMI is not responsible for any errors / damage that occurs in the use of information we provide.   Noki GAGE QD Nokia 90 Nokia 6070