12Vdc Mobile Battery Charger

This circuit provides up to 20 V output from a 12-V automotive supply, to enable constant current charging o
12Vdc Mobile Battery Charger - schematic

f Nicad battery assemblies up to about 18 V total. VI forms a square-wave oscillator, Dl and D2, coupling this square wave to the 12-V battery supply to obtain over 20 Vdc. If this is not needed, SI is left open. Ql forms a current regulator to determine the charging rate of the rechargeable battery. R4 is selected from the table or it can be switched with a rotary selector switch.

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