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Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
Is this old-style flyback with disc secondary or modern all-potted one? If its the old type and the pins are on the secondary, I think one of them will be your HV ground. You can measure this with ohmmeter, assuming your flyback has no diode on output. Just measure resistance between HV output and the pins, the right one should read around 70-700 ohms.
Registered Member #1576
Joined: Sun Jul 06 2008, 12:48AM
Location:
Posts: 13
Its a modern potted one from a projection TV. There is also a pin on the bottom that is labeled HV and one labeled GND. None of the pins show any conductivity to the outputs though.
Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
TheMooseGoesMoo wrote ...
Its a modern potted one from a projection TV. There is also a pin on the bottom that is labeled HV and one labeled GND. None of the pins show any conductivity to the outputs though.
I think you have a score there a Rear Projection flyback can take some serious watts of power (there is a vid on youtube with 700 watts). I think what you have to do is to find a power supply which gives more than 24V DC, hook the negative to your flyback output, hook one of your multimeter probes to the positive, and prod around the bottom of the flyback with your other multimeter probe until you measure some voltage. Another way is to build a low powered driver and wave the HV output around the bottom flyback pins, and which gives the most corona/longest arc is the one you want to use. I personally don't like this method as it can damage the transformer internally.
Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
TheMooseGoesMoo wrote ...
Wow 700 watts? Hooray for dumpster diving Should I just solder the outputs together?
you mean the HV output? I prefer to put an alligator clip on the HV lead but if it is relatively long you can just solder it. Btw here is the flyback vid
Registered Member #1497
Joined: Thu May 22 2008, 05:24AM
Location: Toronto, Ontario, Canada
Posts: 801
Shameless thread pimp:
More importantly, describes the procedure of hooking up a 24v+ power supply to the flyback to find the HV secondary (it has a high resistance, so you need to push 24v through to get any reading on the other end)
Registered Member #1576
Joined: Sun Jul 06 2008, 12:48AM
Location:
Posts: 13
Dr. Kilovolt wrote ...
TheMooseGoesMoo wrote ...
Wow 700 watts? Hooray for dumpster diving Should I just solder the outputs together?
you mean the HV output? I prefer to put an alligator clip on the HV lead but if it is relatively long you can just solder it. Btw here is the flyback vid
Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
TheMooseGoesMoo wrote ...
Yea, but there are three of them on my flyback.
Do you know which one was attached to the tubes/which one is thickest/which one seems to emanate from the largest "structure" on the transformer? Or maybe each tube had its own HV wire from the transformer? In this case you can parallel them.
Of course a picture would be better than 1001 words.
Registered Member #1576
Joined: Sun Jul 06 2008, 12:48AM
Location:
Posts: 13
Each tube had its own HV wire. I can't take a picture at the moment because I seem to have lost the cable to connect it to my computer.
Edit: Eh, I followed the instructions, and none of the pins show voltage between 5 and 10, but all the ones that are labeled with things like DC F/B, AC F/B, HV, and GND all show about 15 volts.
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Flyback question
a Rear Projection flyback can take some serious watts of power (there is a vid on youtube with 700 watts). 
