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Registered Member #1805
Joined: Sat Nov 08 2008, 06:29AM
Location:
Posts: 67
Hey! :)
We have 2 CRT TV's that we don't use anymore, Dad said I got like a week before he will through them out, we don't have much room here anymore... I've already got 3 flybacks out of TV's but the thing is I'm pretty limited, I don't really buy components and try to build things from old stuff... I've never even used the 3 flybacks that I have, due to not being able to make anything to drive the flybacks...
What I'm asking is, are there any things I could make out of perfectly good working CRT TV's? Like a capacitor charger for a coilgun? or a tesla coil? anything? Because when I scavenge parts I never end up using them, and my junk pile just gets bigger...
I would really like to make a capacitor charger but I'd also need to regulate it, I know quite a lot from reading around this forum and yet I haven't built a circuit from scratch yet...
Registered Member #3114
Joined: Sat Aug 14 2010, 08:33AM
Location:
Posts: 608
For a capacitor charger i use a rewound flyback and the Mozilla ZVS flyback driver. For the ZVS flyback driver you need a decent quality capacitor just the kind that happen to be in CRT TV's they are located in the back where the power comes in from the wall to the board. They will say ~250v .68uf or close to that. Also there are good mosfets in the TV driver boards, which if you salvage the right kind you can build the driver. The circuit also requires a heat sink, high speed diodes and big resistors which all seem to be in a CRT TV.
As for the regulator, you are probably going to have to order a IC, or use a multimeter.
Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
I keep the whole circuit boards and desolder components when I need them. I usually recycle power semiconductors, heatsinks, electrolytic and other caps and power resistors.
PS. You might want to strip the degauss coils out ov the TV's. These are a nice source of enameled wire and will do eg. for a small Tesla secondary.
Registered Member #3414
Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
I once used a monitor as a capacitor charger.
Just disconnect the HV lead from the screen (that rubber thing with the hook inside it), connect another wire to the chassis, and charge your capacitors.
Obviously use chicken sticks, also the discharge from the capacitors can cause EMPs that can damage nearby electrical equipment like the tv/monitor
(I made some saltwater caps from 2 litre plastic (polythene) drinks bottles, wrapped in kitchen foil and parcel tape, with plastic corks wrapped in insulating tape in the top, with plenty of wire inside the bottle to reduce resistance. Then I rolled some using kitchen foil and rubble sacks)
These can be LETHAL, though. so take the necessary precautions.
Registered Member #1805
Joined: Sat Nov 08 2008, 06:29AM
Location:
Posts: 67
LittleVenture: Thanks :) Would you happen to know where I could find a schematic for making a flyback driver? Every driver I've found has needed a 555 timer, is there a way around this? I can use a multimeter to keep an eye on the charging so that isnt a big problem at the moment :)
Dr. Kilovolt: Are the "degauss coils" the long length of enamel wire that is covered in electrical tape? because I've found that in other TV's I've taken apart.
Ash Small: I think I'd want a bit more control over the voltage, rewinding the flyback so it doesnt produce thousands of volts, the saltwater caps sound interesting though I might try making them sometime :)
Registered Member #3414
Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
GuitarLord66 wrote ...
. Would you happen to know where I could find a schematic for making a flyback driver? Every driver I've found has needed a 555 timer, is there a way around this? .
Try googling 'single transistor flyback driver'
GuitarLord66 wrote ...
. Are the "degauss coils" the long length of enamel wire that is covered in electrical tape? because I've found that in other TV's I've taken apart.
.
I think he means the coils on the back end of the cathode ray tube, around the neck. I've used these to re-wind flyback secondaries, but they can be a bit fiddly to remove/strip down.
Registered Member #3610
Joined: Thu Jan 13 2011, 03:29AM
Location: Seattle, WA
Posts: 506
No, the coils on the neck are the deflection yoke that steers the beam. The degaussing coil is a bundle of enameled wire wrapped in tape that surrounds the bell of the tube. It's used to demagnetize the shadow mask and internal structure when the set is powered up.
You might have noticed if you turn on a CRT TV and then rotate it around while it's on, the colors will get all messed up. They come back if you put it back to the original position or shut it off long enough that it degausses again on power up.
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Any use for CRT TV's?
