10 Feb
2009
10 Feb
'09
12:41 p.m.
Of course, I may well need a drive that's having
speed regulation issues in
order to prove that it can track the speed correctly...
That shoukld be easy enough.. Many of the full-height 5.25" drives used a
combined motor and tachogenerator with a belt drive to the spindle. Teh
control circuit was often based round an LM2917 chip with a twiddlepot to
set the speed.
Eitehr turn the pot by hand to get the thing off-speed., or find some way
to inject a very slow analogue signal into the circuit to cause the speed
to vary a bit over time.
-tony