Part of my interest was building something all-valve/tube. As always
with this sort of circuit the inefficiency of the rectifier is appalling.
But a microcontrolled version is on the agenda as the tubes do turn up
on ebay. The twin triode multivibrator is a bit eratic and can be hard
to set to get a near stationary object.. But it freezes the chuck of a
drill and the contents of the washing machine on fast spin. I hope to
add some videos to the webpage when I can sort out the additional
strobing effects between the digital camera and the flashing stroboscope.
NSP1 Ebay item 261169937643 - listed in the blurb as a "great audio
tube" hmm......
A photo of (or link to) the older strobotach you have would be of
interest; a google seach only turned up the modern digital versions that
I could recognise.
Grahame
On 09/03/2014 17:28, NeonJohn wrote:
Nifty. I have two of the general radio Strobotachs that used the neon
tubes. I'm reversing direction on one. I'm putting solid state
internals in it with a microprocessor to read the big pot and set the
speed. That will get rid of the drift that plagues this model.
Best part is, I can fit the microprocessor without stripping out any of
the tube guts other than removing the tubes so the unit can be restored
to original if desired.
I also have a modern StroboTach. Now that thing is slick. I picked up
6 spare conducted arc strobe tubes for practically nothing at a hamfest.
NIB. I 'bout freaked when I saw the company now making the StroboTachs
charging $500 for a replacement flash tube.
John
On 03/08/2014 11:42 AM, Grahame Marsh wrote:
http://www.sgitheach.org.uk/strobotron.html
Enjoy
Grahame
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