I love this! It's also awesome that the author considers it "basic", at that size and depth of detail.
I mean, it describes the voltage-boosting circuitry of the Proton almost to the point of reverse engineering it. That's great (in my book), but not very basic. :)
This is good, I agree, but I have one major criticism: no mention of safety concerns for running non-rechargeable lithium batteries like the CR123 in series.
There are some true horror stories out there from people who have suffered chemical burns and permanent lung damage, even hydrogen fluoride poisoning just from operating those normally, with a manufacturing fault in one of the cells.
I mean, it describes the voltage-boosting circuitry of the Proton almost to the point of reverse engineering it. That's great (in my book), but not very basic. :)