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Registered Member #3075
Joined: Fri Aug 06 2010, 02:44PM
Location: Athens, GA
Posts: 148
So I finally got all my parts in tot convert my PC PSU into a lab power supply, and I am getting 13.1V between the 0V and +12.
I have moved on to finding the pins on my FBT using the methods from both of these sites (they vary slightly), using my multi in series and each possible variant of using the +12V and 0V, and even tried it with the -12V
No matter what I do, I cannot get a reliable reading on any of the pins. I did get it to show .48 V on two pins with one of the configs, but nothing close to 6V (or even 3).
I even gave up using the multimeter, connected the 0V to the HV output line and tried to get any kind of spark on the pins with the +12 (and tried in reverse)
Am I missing something here, or do I maybe have a bad FBT, or what?
Registered Member #3075
Joined: Fri Aug 06 2010, 02:44PM
Location: Athens, GA
Posts: 148
Tried it again with the -12 and +12, and got the .490V reading from two of the pins (the ones off to the side, not in the horseshoe. Found the two sets in the horseshoe that read <1ohm impedance (two different isolated sets from what I can tell), so I believe those were my primary and feedback.
Built the powerlabs circuit, and still get nothing out of the HV output. Tried arcing the output to the pins, and got nothing. Switched the + and - leads (one set at the time), and reversed what I thought was the primary and feedback (and tried the different + and - configs there)...nothing.
If there's something I am missing here, please let me know.
Going scavenging to see if I can find an old TV to get one out of...
**EDIT**
I don't know if it was the FBT being 'bad', or simply not right for the application, but I just dug one out of a 12 year old 27" tv and it tests out perfectly. I get a nice, smooth 6V reading on the ground, and easily found the primary and feedback pins...
Now, If I can just figure out which is primary, and which is feedback...one set of pins is separate from all the others, with the remaining pins connected (minus the 0V ground for the secondary). I assume the primary coil is the one with many pins going to it, and the feedback is the one with a single pair of pins going to it?
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Dead flyback transformer?
