Hello again! My friend designed this cheap recharger circuit for NiMH for me and I was wondering about some of the components that are used in it. Hopefully the picture shows up. My question are; is D2 used for preventing the current from the Recharge battery to flow back to the main power source, and also I'm assuming that the cap is to filter out unwanted noise, now, how do you know what values to use for that? Also what would I need to prevent the battery from over charging? I was thinking of adding a "Sensing Resistor" and a transistor to sense when its about full and have the transistor turn the power off. Will that work? Thanks again!