27 Dec
2001
27 Dec
'01
2:59 a.m.
I found that. More than once. That's for an LED bargraph. I'm
looking for a circuit that operates an old-fashioned galvanometer-
style panel meter with a needle that swings from side-to-side.
I can invent my own - a simple ladder D-to-A to produce a variable
voltage out of the parallel port. I was hoping to save the math
and use resistor values that someone else has calculated, but after
two days of searching, I guess I _will_ have to go do it myself.
What about this: http://www.xess.com/ho03000.html
I can't look at it to verify right now (using Lynx @ work and no PDF
viewer) The one I think you would want is the VGA driver. I believe it
uses the TTL output of a FPGA to four resistors to output an analog signal.
Bryan