[sdiy] O'scope recommend - remove the graticule

[Harry Bissell]

Television CRTs use magnetic deflection rather than electrostatic (like scopes do)
so making a vector display out of them might be a bit of a challenge. Could be done
at low frequencies at least...

I used an old telequipment scope with the graticule removed, and a large lens (6" diameter) to make
a projection 'video show' using my synth to drive it. Woked quite well but not very bright...

H^) harry


----- Original Message -----
From: Tom Wiltshire <tom at electricdruid.net>
To: Tom Bugs <admin at bugbrand.co.uk>
Cc: Synth-DIY DIY <Synth-diy at dropmix.xs4all.nl>
Sent: Tue, 23 Aug 2011 11:56:11 -0400 (EDT)
Subject: Re: [sdiy] O'scope recommend - remove the graticule

Could you modify an old CRT telly or monitor?

There are loads (skipsful) of nice large CRT screens kicking about for no money (=very cheap experiments) and I've seen various sites with mods to make them into oscilloscopes. After all, the guts of it is a ramp for horizontal scanning and a signal amplifier for vertical deflection - not beyond the likes of us, I'd have thought. Just be careful not to zap yourself.

I remember seeing such a thing at the Exploratorium in San Francisco back in 1989. It struck me then as a pretty cool thing to do, and given that memory has remained with me whereas most of last week is a blank, it must have made quite an impression ;)

T.


On 23 Aug 2011, at 10:01, Tom Bugs wrote:

> Hiya,
> 
> I'm looking for recommendations on oscilloscopes which have removable graticules (the grid lines over the display).
> I'm helping a friend put together a video synth system, beginning with vector rescanning and the results would be best without lines over the screen.
> Many modern scopes have the lines actually etched into the display tube, but I'm sure that quite a lot of older 'scopes may have removable graticules - basically we don't want to go purchasing 'blind'.
> 
> There was a thread started about such things at the MuffWiggler site - http://muffwiggler.com/forum/viewtopic.php?t=29973
> - here the Tektronix T-922 was recommended but these seem to be US models in general. And there's not much more for suggestions..
> 
> On a similar note - does anyone know a good 2nd hand 'scope shop in the UK?
> I know there are always lots on Ebay, but so many of them are being sold by people who don't know how they work - it is hit & miss as to whether you'll get something any good.
> 
> Thanks for any help,
> Tom
> 
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Harry Bissell & Nora Abdullah 4eva