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Registered Member #3076
Joined: Fri Aug 06 2010, 07:45PM
Location: San Francisco CA
Posts: 18
hi folks...
I'm back working on my flyback TC and have the parts for a ZVS driver.
What I don't have is a good power supply. The one I do have has only one positive or negative output, which is sad...plenty for most 5 V electronics, but not gonna cut it for the ZVS driver. The way I understand it, I can tie the ground plug to either positive or negative to produce one output with X Volts.
I recently pulled a big old transformer from a stereo amp with a few different taps on it. I have never made a dual pos and neg supply before and am a little unsure about how to do it. I was told today that the trick using a capacitor in parallel and taking a lead from the negative side, only works when drawing uA .
Do I need a special transformer with a center tap ? Until I get to school and can use an O-scope I won't know too much about what I salvaged. I am hoping that someone will share some common knowledge about this topic.
Registered Member #2628
Joined: Fri Jan 15 2010, 12:23AM
Location:
Posts: 627
I personally usually just use a rewound microwave oven transformer, with high capacitance on its output (after rectifier) for filtration, then feed that to a ZVS, a varaic comes handy for controlling the mot.
Id preffer to use MOTs over any other supplies, since it is dirt cheap to build, and less chance of killing it in a ZVS compared to some nicer supplies, that SMPS will come handy one day.
Registered Member #2463
Joined: Wed Nov 11 2009, 03:49AM
Location:
Posts: 1546
wannabegeekTC wrote "I recently pulled a big old transformer from a stereo amp with a few different taps on it.
Many old stereo amps use a dual polarity power supply like this-that amp probably has the bridge rectifier and the caps too. If the trany weight 5 lbs ballpark will be 50 V CT 4 amps with a 5 amp bridge and 2 3000 ufd /35 volt caps.
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Making power supple for ZVS
