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.

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.

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

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

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.

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

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.