상황
A technician building a workbench charger needs a documented schematic for a reliable linear-regulated 12V charger.
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01
Full-wave bridge provides both half-cycles, reducing ripple vs. half-wave design.
02
2200 µF filter capacitor smooths to acceptable ripple at 60 Hz.
03
LM317 Radj/Rfb values set Vout ≈ 14.4 V for proper lead-acid float charging.
Adjust resistor divider values for different target voltages; replace LM317 with LM338 for up to 5 A charging current.