[sdiy] tiny oscilloscope from camcorder CRT viewfinder

[Needham, Alan]

I would hazard a guess that building a "vector-to-raster" adapter
as published in some 80's issue of ETI would probably be more complicated
than simply driving the deflection coils directly.
---- this thing has coils ? are we sure it isn't electrostatic plate
deflection ? ----
Either way, with such a small screen you cannot expect high accuracy so
circuitry could be fairly simple, stealing the existing HT power supply
and adding a couple of (electrically floating) deflection amps and
a ramp generator for timebase.

I have a Thandar SC110a oscillosope - tiny screen, dead handy, cheap !
Service manual on line at ...
http://k1.dyndns.org/Vintage/Sinclair/Other%20Inventions/Other%20Electronics%20Products/Thandar%20SC110A%20Oscilloscope%20Service.pdf

... circuit diagram may help with ideas ?

	Alan


-----Original Message-----
From: synth-diy-bounces at dropmix.xs4all.nl
[mailto:synth-diy-bounces at dropmix.xs4all.nl]On Behalf Of anthony
Sent: 31 October 2007 8:59 PM
To: synth-diy at dropmix.xs4all.nl
Subject: [sdiy] tiny oscilloscope from camcorder CRT viewfinder


I have a tiny little B&W CRT-based viewfinder from an older, but not ancient 
8mm camcorder.

I thought it might be cool to put it as an oscilloscope which could fit in a 
regular synth-module sized enclosure.

I've read about old article making a scope out of a TV, but I don't think 
that'd apply here so much.

I thought maybe some circuits to process the signal and to drive the coils.

I can't tell if this thing takes NTSC composite video or if the small 
circuit board is just a raster-scanner or whatever it's called.

Anyone ever seen anything like this?


aa 


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