The indicated circuit performs a slow charge of 12 V batteries maintaining a constant current of approximately 2 amps. The integrated voltage regulator must be mounted on a good heat radiator and eventually, the 0.2 ohms resistor must be increased if overheating of this component is found. The transformer has a primary winding according to the local power network, and a 1 A fuse in series with the primary is recommended for circuit protection. The working voltage of the 1000 uF capacitor must be at least 40 V.
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