> Someone, I think > John Bange, started to map the circuitry but it seems to be a project that > died. I have taken the defective unit apart and seems almost comical in its > design and construction - so many resistors, transistors and capacitor! > None > of them appear damaged to my eye so I'm wondering what has failed. > Yeah, I got about 10% done with that before I realized that That Way Lies Madness. It is almost comical in its design. It's a fantastic bit of hand-tuned analog circuitry, a throwback to a simpler age. It's almost steampunk in its fabulous complexity. I'm not sure why VDO went analog with it. Perhaps digital microcontrollers were still just s little bit too expensive. I'm still working on a digital replacement. The controller and interface are pretty simple--- just a few transistors and resistors with an Atmel chip. I've already built a couple test units, and they actually worked. The hard part for me is making something that doesn't fall apart. Automotive applications just aren't very tolerant of my sloppy soldering style. -- John Bange |
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