Bad Boy Charger


This is one of those hacks that scares me a little bit. The ‘Bad Boy’ charger was created by Tom Martin to charge EV battery packs. [Pictured is one built by Mike Chancy] You can find the schematic under austinev’s tech files. This thing is a bare minimum power supply – it’ll deliver loads of essentially unregulated power into a set of batteries. If you check out the circuit, you’ll see just how scary this thing really is, but according to its users, it works.

Ben Heck Interview Part 2

Here’s part 2 of my interview with Ben. (Or just grab it via the feed) We answer some more questions and go off on a few tangents about cnc machines, the PS3 and part sources. It cuts directly to the interview – I don’t want to wait 6 hours to record it. I should have a regular podcast up in the next day or two.

Five Dollar Eprom Programmer


A couple years ago I spent a good week wiring up a fairly complex EPROM programmer so I could burn a prom for my jeeps EFI system. Today I ran across this $5 version. build built by Jay Kominek He uses shift registers to handle the addressing and IO lines, all driven directly by the parallel port. There’s no way to escape the number of pins that have to be wired up, but the schematic itself is pretty simple.
[By the way, arcade supply shops are a great source for cheap UV erase EPROMS.]

[Update: I’d forgotten about the voltage change (3 vs 5 if I remember) needed to write UV EPROMS vs EEPROMS. With a little mod, you can certainly use this for EPROMS as well.]

Siamese Electric Motors


I’ve been meaning to post something about these for a while. Jim builds motors for EV hobbiests on the side – one of his cooler creations is the siamese electric motor. Some others have used belt drives to combine motors, but Jim actually builds the motors into a single unit. He built this set of 8 inch twins for the White Zombie drag racer.

I pumped Jim for more details, but he’s not done tweaking his next set of siamese motors. So, why is this even a hack? It’s a nice piece of machine work, but it gets interesting if you consider some stock specs. Most EV cars get 9″ motors – these are rated at 19hp or so. They take some monster hardware just to drive – high amperage, high voltage. Running a pair of 8hp motors can produce similar power with significant cost savings – everything gets cheaper. To generalize, you need a $1500 motor and $1000 controller just to get in the game. Not to mention that rebuildable forklift motors can be had for a song.