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Rapid battery charger

2016-05-11 15:50  
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Rectified and filtered voltage from the 24 Vac transformer is applied to the LM723 voltage regulator and the npn pass transistor set up for constant current supply. The 470 ohm resistor limits trickle current until the momentary pushbutton (S2) is depressed, the SCR turns on and current flows through the previously determined resistor network limiting the charging current.
Rapid battery charger

The SCR will turn off when the thermal cutout circuit inside the battery pack opens up.

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