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Registered Member #2703
Joined: Sun Feb 28 2010, 06:02PM
Location:
Posts: 18
if you split a deflection coil into the two ferite half's there is a coil on each side if i took the coil off one side and wound about 12 turns on it and and plugged the other existing coil with more turns into 120VAC 60hz then connected the halfs together would it turn the 120VAc to about 12Vac
Registered Member #1225
Joined: Sat Jan 12 2008, 01:24AM
Location: Beaumont, Texas, USA
Posts: 2253
You do not seem to understand transformers very well. A ferrite core, like the one you mentioned, is not made for mains. It would saturate, and basically the mains would be a short, and the 'primary' wire would blow up.
Registered Member #162
Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3140
Technically you can use ferrite for a mains transformer BUT As implied above, the useable flux density is much lower (10x) than transformer steel, so 10x more turns-per-volt would be required for the same core cross-sectional area, which would ba a lot of turns. AND the permeability of ferrite is less than transformer steel and there will be an airgap in the flux path, so the magnetizing (no-load) current will be higher. SO for practical reasons don't bother trying to make a mains transformer with a ferrite core.
Registered Member #96
Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4061
yeah, too risky. Surely a suitable 120-12v transformer can be had from any old power supply etc (I have one sitting here that is unsuitable due to voltage incompatibility)
Registered Member #2463
Joined: Wed Nov 11 2009, 03:49AM
Location:
Posts: 1546
With your deflection coil mains transformer, an experiment would be connect resistors to the 12 volt output and find out how many ohms would cause the 12 volts to drop to 6 volts. Once you know that, you can calculate the maximum power in watts your transformer can provide. Its E^2/R or 36 divided by the load resistance.
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Deflection Coil Mains transformer
