Non-Isolated Battery Charger

Created "Oct 26 2003" 

"CAUTION" ** SHOCK HAZARD **
This Circuit is "Live", It Operates directly from the line voltage.
Use this circuit ONLY when it is Completely Isolated from any persons
coming in contact with it, the battery it is charging, or any associated
connecting circuits.


"I Assume No Liability from the Construction or Use
of this circuit"


USE IT AT YOUR OWN RISK!


Using this circuit will give Good Charging results to a Sealed Lead Acid
Battery, like I use in the Metal Detector.


It is Extremely Small in size and has a low parts count, making it ideal
in some situations. It can also be adapted for Charging Nicads.


This charger is both Current and Voltage Regulated.


The Output is short circuit protected.


The 1 Ohm resistor is a Fusing Resistor, Protecting the battery in case
a short occurs.


With the 2.2 ufd capacitor it will produce an output of about 100 Ma.
A capacitor of 1 ufd will produce an output of about 50 Ma.


The Zener used here, is rated at: 14 Volt and 5 Watts.
I do not recommend a lower wattage than this.






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 Chemelec 
 *Copyright © 2003*