Originally posted by Matthew Jones
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What I found so far:
- Fet needs to switch hard. Not enough in the gate and no gain.
- Higher freq = more power - just as you said Matt
I'm running at 27kHz at the moment and primaries stay around 12.7V and 12.6V for the past 25min. I have 20W load and 13.50V across.
When I go down with freq. B2 (bad one) goes up to even 16V but I can't hold V on primaries unless...I could use bigger load to hold B2 down .
I'm a bit worry about this small Fet and I only have couple of them (to kill, LOL).
I just noticed something; after awhile B2 slightly drops say from 13.7V - 13.4V. At the same time I see a slight drop in primaries but only in 0.02 range.
This is really promising
Forgot to add: I scope across secondary winding and I see over 30V spikes. This is under the load.
I'll try to get at least a picture. My daughter rolled down the stairs with camera in her hand. Daughter survived but display is dark and I can't see what I film until processing.
Cheers
Vtech
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