3 Jul
2006
3 Jul
'06
2:10 p.m.
I've already cracked open the meter and tweaked the internal load
resistor. The simple 8-resistor ladder I built _works_, with the
exception of a noticable dip in voltage between 2^5-1 and 2^5, and
2^6-1 and 2^6, and 2^7-1 and 2^7.
What resistor vavlues are you using, and what tolerance?
Second, The output port is TTL? CMOS? IF TTL the
output swing is
not to 5V to with even light loads. IF CMOS output voltage will sag
if the load is too great.
To be honest, I have no idea - it's an integrated port on a modern
machine. If I had to guess, I'd say it's a CMOS port, but I don't
know that for a fact.