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Banned on 1/22/2011 for repeated rule violations after multiple warnings. Registered Member #3299
Joined: Sat Oct 09 2010, 08:11PM
Location: Bantown, USA
Posts: 220
hmm my zvs driver makes radio make a fluctuating sqeal.
Registered Member #1408
Joined: Fri Mar 21 2008, 03:49PM
Location: Oracle, AZ
Posts: 679
There is also a method of testing the 250's. There should be a level of resistance that the datasheet may supply. Don't quote me on this; as I'm not sure but I believe it may be from the source to the drain @ 6.x ohms. MOSFETS don't have to explode for them to be bad.
Registered Member #2838
Joined: Fri Apr 30 2010, 07:55PM
Location: tehachapi, CA
Posts: 333
Do a search for testing mosfets on google. There are a few simple tests that can be done with a meter that will give you a "good" idea if they are toast.
Registered Member #3395
Joined: Thu Nov 04 2010, 08:42AM
Location: Christchurch, New Zealand
Posts: 193
Just did the MOSFET test at "http://www.4qdtec.com/mostest.html". Both of them turned out to be fine! Yay! I also reconfigured the fast diodes just in case. My suspicions have been aroused; I think the problem is the power supply which is my 12v 5Ah SLA battery.
I once used it to power another flyback driver when it run out, so I charged it back up and used it again but instead I ended up with a IRF540 in the bin. My multimeter reads 19 amps for a 5 amp SLA!!! I charge it up with a 4 amp charger... It's really weird.
Registered Member #3395
Joined: Thu Nov 04 2010, 08:42AM
Location: Christchurch, New Zealand
Posts: 193
radhoo wrote ...
you can also build this multitester that will check mosfets but other components as well, complete construction details on my blog:
Thanks for the help, but unfortunately I don't know anything about programming so I won't be able to make it. Besides, this is only a minor test which can be done with a multimeter.
Registered Member #2893
Joined: Tue Jun 01 2010, 09:25PM
Location: Cali-forn. i. a.
Posts: 2242
5Ah is the battery capacity, not ho many amps it can provide. Your battery can provide 1 amp for 5 hours, 5 amps for one hour, 10 amps for 30 minutes etc.
A good SLA battery can provide currents in excess of 15 amps, I have one that can provide 60+ amps.
Registered Member #3395
Joined: Thu Nov 04 2010, 08:42AM
Location: Christchurch, New Zealand
Posts: 193
Yeah, I know. I just learnt about amp-hours and stuff. The problem is that I used this to power two flyback drivers, and none of them worked. So I will buy a 300VA 18v+18v toroid with a rectifier and smoothing capacitor for a better PSU.
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ZVS Flyback Driver troubleshooting
