Battery charger with LM317 Circuit Diagram. An LM317 voltage regulator is configured as a constant-current
source. It is used to supply the 50 mA charging current to S01-S06, an
array of AA-cell battery holders. Each of the battery holders is wired
in series with an LED and its associated shunt resistor. When the
battery holder contains a battery, the LED glows during charging. Each
battery holder/LED combination is paralleled by a 5.1-volt Zener diode.
If the battery holder is empty, the Zener conducts the current around
the holder.
A timing circuit prevents overcharging. When power is applied to
the circuit, timing is initiated by IC2, a CD4541
oscillator/programmable timer. The output of IC2 is fed to Ql. When that
output is high, the transistor is on, and the charging circuit is
completed. When the output is low, the transistor is off, and the path
to ground is interrupted.
Battery charger with LM317 Circuit Diagram
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