op amp as comparator basics? Answered
well... I'm making this battery charger cum level indicator, which should turn off the battery supply when its voltage drops below 10V.
Im using an opamp as a comparator to do that. I have been scratching my head for 3 days but cant get this sorted.
From what I have been experiencing for years, on an op amp if the potential on the in+ pin is higher than that on the in- pin, then the output pin goes high, else low. Right?
Now in this particular case (and the first time in my life) the ic gives 4.xx Volts on the output pin when in+ is higher than in- and 11.xx volts when in- is higher. Vcc is 12V.
Im bugged... I have attached the part of the Schematic that shows the IC and its connections. Please have a look.
I haven't changed the IC yet, im doing that in a minute anyway. I'll mark this solved if the new IC does the trick. :)