18 Jun
2011
18 Jun
'11
10:53 a.m.
They're useful for quite a lot of things.
There's a neat design for a
'They' meaining stroboscopes or white LEDs? Either is applicable.
simple fixed-frequency short-pulse LED strobe, with
construction notes,
on the vinylengine website:
http://www.vinylengine.com/diy-strobe.shtml
http://downloads.nakedresource.com/download_centre/index.php?diy_strobe.pdf
I designed my own on the back of an envelope and had it work first time.
The vairable one uses 4000-series CMOS logic with a 7555 oscilator, the
50/60Hz one uses 74HC(T) logic with one of those 4-pin oscilator moduels
as the clock.
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.
-tony