12v Battery Charger Circuit with Auto Cut off

[green90]

1-what will be the voltage on( cv or pin 5)coz it internally connect to voltage divider


http://www.circuitsgallery.com/2013/04/automatic-battery-charger-controller.html
Working

• Positive terminal of the upper comparator of 555 is connected with reference voltage in order to turn OFF the charger if the battery charges above 13.8V.
• why they said Positive terminal ?????? i think ( cv or pin 5) is negative terminal

 

[Arouse1973]

Pin 5 is the inverting terminal of the 555s internal comparator. I think what they mean is that it's related (connected) to the TH pin which is the non inverting terminal of the comparator which just happens to be more positive than the CV pin.
Adam

 

[Colin Mitchell]

"http://www.circuitsgallery.com/2013/04/automatic-battery-charger-controller.html"

This is just a badly designed circuit. It will not deliver more than 2 amps and the hysteresis value is unknown.