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4hv.org :: Forums :: General Science and Electronics
<< Previous thread | Next thread >>   

Any TV experiments ?

Author Post
JamesH
Mon May 14 2007, 08:11AM Print View
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
Registered Member #154
Joined: Sun Feb 12 2006, 04:28PM
Location: Westmidlands, UK
Posts: 259
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......
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Dr. Dark Current
Mon May 14 2007, 04:07PM
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
Registered Member #96
Joined: Thu Feb 09 2006, 05:37PM
Location: Republic of Guernsey
Posts: 3775
You could turn the TV into a 'scope, using the 12F675-based circuit here. :)



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
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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