19 Jun
2011
19 Jun
'11
2:59 a.m.
On 18/06/2011 18:53, Tony Duell wrote:
The reason I needed astorboscope intitially, BTW was
when I had to rewind
the motors in my HP9125A plotter and whatned to check the voltage-speed
characteristics of the 2 repaired motors was similar. It was.
That needed the asjustable strobe. I knocked up the 50/60Hz one using
bits from the junk box, and found it very useful for setting up floppy
drive spindle speeds.
The one I gave the link to, was for a similar purpose -- checking the
speed of turntables for vinyl records -- though it could be used for
anything you can put a 50/60Hz strobe pattern on. It's an elegant 2-IC
design (a CD4060 and a CD4013) that runs off a PP3 and fits in a small
standard box.
--
Pete Peter Turnbull
Network Manager
University of York