17 Jun
2011
17 Jun
'11
4:21 p.m.
On 17/06/2011 22:21, Tony Duell wrote:
I hve found that white LEDs are an ideal light source
for stroboscopes,
and you can easily disng the circuitry to provide a short light pulse
with a much longer gap between them which gives a clearer indication of
the strobe markings.
Some time back I built a pair of such strobes. One has an adjustable
oscillator, switchable divider chain, and am output (1:1 mark-space
ratio) at the flaching frequency to drive a frequency coutner. The other
is crystal-controlled and gneerates 100 or 112 flahses per second to
simulate a mains light source in Europe or the States. I find that gives
am uch clearer indication for things like floppy drive speed strobe disks
than a mains light bulb does.
They're useful for quite a lot of things. There's a neat design for a
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
--
Pete Peter Turnbull
Network Manager
University of York