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Forums
4hv.org :: Forums :: General Science and Electronics
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Any TV experiments ?

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JamesH
Mon May 14 2007, 08:11AM
JamesH Registered Member #579 Joined: Mon Mar 12 2007, 09:45AM
Location: Burntwood, Staffs, England
Posts: 46
While waiting for Capacitors and diodes to come from China ... Tesla stuff

I have been experimenting with an old, portable B&W TV
Things to show my Grand children .... swaping Hz and Vert. coil leads
inputing Audio to the deflectors and getting it to work with as a simple osilloscope

DOES ANY ONE KNOW OF ANY MORE DEMONSTRAIONS I COULD DO

I might get a colour set ( FREECYCLE is GREAT) and swap the colours over ???
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Bennem
Mon May 14 2007, 03:10PM
Bennem Registered Member #154 Joined: Sun Feb 12 2006, 04:28PM
Location: Westmidlands, UK
Posts: 260
How about using the tv's EHT supply for making
a lifter?
Some guy did this at a local Teslathon here a few years ago,
getting the 'lifter' to rise around 12 inches or so...... smile
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Dr. Dark Current
Mon May 14 2007, 04:07PM
Dr. Dark Current Registered Member #152 Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
JamesH wrote ...

Things to show my Grand children .... swaping Hz and Vert. coil leads
This will probably not work, because the two coils have very different resistance and number of turns. If you do this the vertical amp. will probably blow.
DOES ANY ONE KNOW OF ANY MORE DEMONSTRAIONS I COULD DO
Make some sparks! Keep the runs short, as this is overloading the horizontal circuit, don't be surprised if it blows...
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Conundrum
Mon May 14 2007, 07:57PM
Conundrum Registered Member #96 Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4059
You could turn the TV into a 'scope, using the 12F675-based circuit here. :)

Link2

Uses 27 MHz crystal, obtainable from any broken TV or video with a Dolby decoder and/or teletext, as well as some old pc motherboards.

-A
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Marko
Mon May 14 2007, 08:03PM
Marko Registered Member #89 Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
You can use HV to directly power lifters.

To draw sparks, use a large value (10..20M) high-power resistor arrangement to prevent burnout of your horizontal deflection circuit.

Large resistor must limit current to 1-2 miliamps or so, so don't save on it.

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