Home Made 9v Charger - The Circuit Math

I needed a 9v Battery Charger, I decided to make one. Using a Maxim DS2715, I explain the circuit, how it works, and all the math. 0:00 - What's Relevant Today ? 1:51 - Introducing out Chip for this Evening 4:17 - How it works 8:28 - NiMH Charging Methods. 9:58 - The Timing Circuit 11:04 - Setting the Charge Rate 12:07 - My Circuit 15:00 - A Note on Grounding 15:59 - The Math ! 16:00 - Setting the Cell Count 18:49 - Mosfet Pullup 19:30 - The LED 19:59 - Setting the Charge Rate 20:57 - Setting the Timer 22:40 - Predicting Final Charger 24:11 - It's Over !