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Registered Member #3114
Joined: Sat Aug 14 2010, 08:33AM
Location:
Posts: 608
i had a 13.8v 7 amp power supply that died so i thought i would try out the transformer to see what the voltage was, i hooked up my multi meter and got about 1 volt dc so i went to ac and it read about 18vac. i read some stuff on half waver rectification connected some diodes and check the dc voltage on my muliti meter, it was about 10v volts i connected it to my ZVS driver and nothing happened so i took off the diodes and tired "ac", i got little tiny spark. what is happening
Registered Member #540
Joined: Mon Feb 19 2007, 07:49PM
Location: MIT
Posts: 969
You need to make sure that the diode you have is rated for at least the peak current you are expecting to draw (maybe around 15A with a fuse for a bit of headroom). You should probably use a bridge rectifier because it makes filtering easier. It doesn't seem like you filtered the output of the half wave output. Since you are only getting an output from the diode half of the time, the ZVS driver will be off a lot more than half the time (it starts functioning around 9V I think).
Registered Member #2463
Joined: Wed Nov 11 2009, 03:49AM
Location:
Posts: 1546
The 22-811 Radio Shack looks good as an experimenter's meter. As to its value, that would depend your market area and what other meters you can select from with similar specs in the price range.
One marketing trick Radio Shack has done is to discount discontinued models with the price dropping as the remaining stocks are sold. If you pay attention, you could get meters as much as 30 cents on the dollar if you asked the store what the current price is. I've got class sets of meters that way.
As to the durability of Radio Shack/Micronta/Archer products I've been using them for 50 years and own about 40 of their DMM's, including some sets bashed about/burned out then repaired by learners.
Registered Member #2431
Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
is this PS a linear or SMPS?
once you get a new DMM, do these: first, check your transformer secondary output, VAC should be present. if so then, check the polarised output of the bridge-diode, it should be VDC.
post these answers, we'll solve this systematically. no guesses.
Registered Member #2893
Joined: Tue Jun 01 2010, 09:25PM
Location: Cali-forn. i. a.
Posts: 2242
Personally I love my vintage RSR multimeter. It's all discrete components, and It even survived an accidental 2kW when I accidentally measured voltage on ampere mode. The probes melted though.
I suggest getting an RSR or a Fluke. They are very hard to break from my experience.
And please post a pic of the bridge. Can't tell you without a pic.
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power supply transformer output problem
could you guess what the problem is ?
