On 3/9/2014 11:25 AM, Grahame Marsh wrote:
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 StroboTachscharging $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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