Small CRT Questions
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From: John Devereux on 25 Jun 2010 12:02 "Phil Allison" <phil_a(a)tpg.com.au> writes: > "John Devereux" >> >> "Phil Allison" [...] >>> This page has some interesting circuits for very simple scopes: >>> >>> http://www.electronixandmore.com/project/7.html >> >> >> Nice! >> >> This was my first entry into electronics as a ~13 year old, trying to >> make a large black and white TV into such a "scope". It worked, sort >> of. Not very well of course due to the coil inductance. But I got a >> waveform displayed without killing myself. > > > ** Ha, ha !!! > > I did the exact reverse at age 16. > > Having built a very basic valve scope with a Philips 3 inch tube, > > http://members.chello.nl/h.dijkstra19/big/crt/CV2431-big.jpg > > I decided to connect it to the internals of my 17 inch B&W TV - after a > few false starts and a few * sparks* I was very delighted to get a small > green and black viewable pix. I seem to recall, later on, hooking up a UHF tuner and a ramp generator to my (bought) scope, so as to get a tiny dim green unstable picture. Not sure exactly how I could have done that now, since there is no way I would have known how to make a sync separator. Must have used the scope TV trigger for H and manually "tuned" the ramp generate for V. I've never made a valve circuit, looks quite fun now, from my older perspective. > > I still have the same scope and it still works. > > Got 5 more besides now. > > > ..... Phil -- John Devereux
From: Spehro Pefhany on 27 Jun 2010 09:11
On Fri, 25 Jun 2010 11:02:57 -0400, Spehro Pefhany <speffSNIP(a)interlogDOTyou.knowwhat> wrote: >Lovely little tube. Great company video here on how Tektronix used to make their own CRTs in-house. http://classictek.org/index.php?option=com_seyret&Itemid=100&task=videodirectlink&id=1 Best regards, Spehro Pefhany -- "it's the network..." "The Journey is the reward" speff(a)interlog.com Info for manufacturers: http://www.trexon.com Embedded software/hardware/analog Info for designers: http://www.speff.com |