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4hv.org :: Forums :: High Voltage
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flyback help

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jameselectric
Wed Mar 21 2007, 12:16PM Print
jameselectric Registered Member #535 Joined: Sun Feb 18 2007, 06:03AM
Location:
Posts: 65
hello,

i've decided to construct a mosfet driven flyback. i am using the powerlabs website as my basis for construction. i have an old flyback out of a tv. this is my first encounter with the device. my questions is what is what on this picture.

Thanks,
James
1174479368 535 FT0 Flyback
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Myke
Wed Mar 21 2007, 01:57PM
Myke Registered Member #540 Joined: Mon Feb 19 2007, 07:49PM
Location: MIT
Posts: 969
well, there is the core, the secondary, the primary is built in, some wire connected to the pins of the flyback, some rusty metal clamps that held the flyback to whatever, the HV wire, and a componant (most likely a resistor) on the pins. It looks like the core has fractured for some reason.
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Sulaiman
Wed Mar 21 2007, 04:15PM
Sulaiman Registered Member #162 Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3140
Yes the core does look fractured, don't worry, just use superglue.
(make the repaired gap as small/neat as possible)

This is quite an old type of flyback which is good.
there is no inbuilt eht diode
(probably was a tubular device a couple of inches long)

Don't worry that the original diode is gone, they were mostly crappy anyway.

Since there is no inbuilt diode a multimeter will tell you which of the pins is connected to the 'earthy' end of the secondary (10's of kOhm expected)

Good luck.
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