azog | June 15, 2006
Did some final assembly today: The R2R ladder network, on a perf board. The heavy black wire is one of the wires going to the meter. The mess of wires on the right is the cable going to the parallel port. The rest of the case. I drilled a hole thru the case, and ran [...]
azog | June 14, 2006
I pressed my mental reset button, and waited a few days before working on this again. I think I understand what I did wrong the last time – I had the bits wired in reverse, so that the output was skewed. Higher output on a lower input; lower output on a higher input. That kinda [...]
azog | June 9, 2006
Ok, the analog meter has some problems, and yesterday I wired up a 10-segment LED display (only 8 used) to help me figure certain things out. But then it hit me that just a small adjustment to the tcl code would turn this into an LED meter. So it also turns out that my Sony [...]
azog | June 8, 2006
Ok, there’s a serious problem with the meter, which I just noticed. The meter was higher depending on bit sequence of the data sent to the parallel port. For instance, if I send a 127, that would register higher than if 128. It seems to be only on the odd numbers, when bit 1 was [...]
azog | June 8, 2006
I did some minor work on the meter. My original looked something like this: It’s kinda a crappy schematic. Not shown is a pot between the meter and the output pins. Here, all the resistors are just tied together, and there’s no real current differential. But it still worked? Which makes me think that the [...]
azog | June 4, 2006
edit: see my update: phase two Disclaimer: Everything I do here can damage or destroy you, your computer, your house, your pet, or even the delicate balance of the universe. If you try what I try, and you burn down your house, remember that nobody held a gun to you. You did it of your [...]