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Registered Member #162
Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3140
Since neither you nor I know the halogen transformer frequency or the inductance of your primary on the flyback transformer I can't give a definite answer,
If 0.68 uF is what you have, use it, before you make a 'good' primary try 8,7,6,5,4... turns with the 0.68 uF capacitor, see if there is a 'sweet spot' the capacitor should be in parallel with (across) the flyback primary and halogen transformer output
If the halogen transformer can survive, a series-resonant arrangement would probably get the most power output with the capacitor in series with the flyback primary, if the resonant frequency matches the halogen transformer output frequency you will get the most power throughput you may also destroy your flyback secondary due to over-voltage. ;)
Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
The capacitor in *parallel* to the halogen transformer output will most likely kill it. The output is a square wave and you know what a capacitor supplied with a square wave voltage does.
Registered Member #3414
Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
Platinum has quite a bit of experience with this setup, but he has managed to destroy several halogen transformers. He has some old threads with huge arcs somewhere.
EDIT: found a link to one of his threads on the subject:
Registered Member #5208
Joined: Thu Jun 07 2012, 06:12PM
Location:
Posts: 86
So it's a bad idea to connect cap to it? Ash Small, I saw those videos, thanks. The output of the halogen transformer is AC, I thought it's sinusoidal?
Registered Member #5208
Joined: Thu Jun 07 2012, 06:12PM
Location:
Posts: 86
Dri0m,I have this zener diode, it's not typical straight design but I've been told it works the same I have only 0,25W 10k resistor, it's too weak? By the way, 0.68uF is the same as 680nF, right?
Registered Member #4497
Joined: Thu Apr 19 2012, 12:53PM
Location: Behind you
Posts: 62
zippotix wrote ...
Dri0m,I have this zener diode, it's not typical straight design but I've been told it works the same I have only 0,25W 10k resistor, it's too weak? By the way, 0.68uF is the same as 680nF, right?
that diode looks old. 0.25W resistor will probably heat, but not overheat, so it should work
...and yes... but capacity is not critical, i'm personally using 4uF cap, higher capacity = higher power, but 680nF is good
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SMPS Flyback question
