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I need a circuit that can turn the battery charging circuit off when the battery gets to about 1.65 volts, or i need a circuit that turns a LED on, when the battery is at 1.65 volts. Can someone please help me? I believe you can use a pnp transistor to turn off when the battery gets to a certain voltage, but i have no idea on how to do it. I already designed the charger, i am making a pulsed charging circuit for different battery types , that are rechargable, i use a 555 to make the pulse at a certain duty cycle and than at a certain frequency, just need the turning off part or tell me when the battery gets to the correct voltage of 1.65 volts.