ah, man, checked back on this old thread.. didnt realize you had posted the original circuit! you see my picture on the last page? thats your circuit. i'm an EE undergrad in WI. thank you so much, seriously. i had like 30 or so sg2525 schematics back then, which were all garbage.. i ended up finding yours, and in the process learned a massive amount. may seem silly to you but it basically "made something really cool work", and that launched me into a frenzy. funny part is you were prolly just doodling around one night hahaa .. anyway, ya, i still have like 10 printouts of it hahaha i use that for the pinout instead of the datasheet.