3,7v Emergency Charger Nokia Cellular With 9v Battery

Hello to all. I wanted to propose to you a simple cellular charger with technology of low level that however works and carries out its task perfectly. Draft of a cellular charge of emergency that can be indispensable if it is found to us with the batteries is down and without a station of charge to hand capacity that is in all those unforeseeable situations that before or after can happen.

Step 1: The Components

The circuit is much simple one and comprises besides the battery of 9v a made reducer of tension of approximately 2v from 4 diode valves 1n4007, in series to a resistance PTC, member that I have extracted directly from a local p0wer source of cellular from 3,7v that it must have a function to stabilize the tension and to make to limit the current in case too much absorption.

Step 2: On Air

All the components have been knit in air between they and their time connected to the cable and to the feeding thorn.

Step 3: The Assy

Here all together before being opportunely isolated and encapsulated in the container;

Step 4: The Fuse

As last thing I have connected a fuse in series in order to prevent dangers in case short-circuit. The fuse from put me is of 100ma but this valor is approximate.
I have maintained this value for emergency low.

Step 5: The Video Charge

In the short video it can be seen as my local power source works to the perfection.

Step 6: Conclusions

This job has been simple to execute but useful for the application to which it is lend. I hope to have helped someone with this explanation! Salutes and to the next one on these pages.