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Registered Member #135
Joined: Sat Feb 11 2006, 12:06AM
Location: Anywhere is fine
Posts: 1735
To confirm what PM is saying, I have taken many TV's apart that have the 5 pin 130V regulator that feeds the primary side of the flyback, so they were running the primary in excess of 100V.
Registered Member #2431
Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
Hazmatt_(The Underdog) wrote ...
To confirm what PM is saying, I have taken many TV's apart that have the 5 pin 130V regulator that feeds the primary side of the flyback, so they were running the primary in excess of 100V.
That's interesting, we typically run them at much less here on the forum. and it wasn't until I put 50 V in till I got really good results. (into a 65 v winding)
Registered Member #543
Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
Patrick wrote ...
Hazmatt_(The Underdog) wrote ...
To confirm what PM is saying, I have taken many TV's apart that have the 5 pin 130V regulator that feeds the primary side of the flyback, so they were running the primary in excess of 100V.
That's interesting, we typically run them at much less here on the forum. and it wasn't until I put 50 V in till I got really good results. (into a 65 v winding)
I'm sure many disappointments, such as feeble operation, could have been avoided if more attention had been paid to matching the LOPT's design parameters. Where an LOPT's windings and core have been designed to operate at the PAL line frequency (15.625 kHz), for example, driving it at a very different frequency may well lead to disappointment.
Registered Member #2431
Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
[quote] . . . designed to operate at the PAL line frequency (15.625 kHz), . . .
I still cant figure out what the right duration is in uS and I guess it should be 15.625 Hz even if its a high resolution monitor from the early 2000's ?
Registered Member #1565
Joined: Wed Jun 25 2008, 09:08PM
Location: Norway
Posts: 159
You can multiply number of lines with refresh rate to get a somewhat too low estimate of the frequency. But 50 kHz+ sure.
You will also find a switched capacitor bank to change the working frequency, basically fets and capacitors.
Some crt computer monitors use a separate hv supply running at a almost fixed frequency. If you can remove the supply from one of those, you will have a fixed 25-30 kV source!
Hi PM , looking at that diagram , the dot markers are on the same coil start ends . I thought they were supposed to be out of phase wound ..... or is that for discontinuous mode :0. ?
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Questions About Flybacks.
