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Old 11th May 2003, 07:59 PM   #11
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something like this perhaps??

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i am using multisim to simulate and for some reason when i put in an electrolytic capacitor the simulation did not come up right so i had to create these 1000uF non electrolytics...
the scope is showing vac in (top) and vdc out (bottom), the meter is showing vdc rms.. i guess just a high current diode would be fine?

-chris
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Old 11th May 2003, 08:02 PM   #12
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Check this thread:

joensd

Don't go too crazy, as you are not sure you will be happy with the end result yet. Maybe buy some surplus caps 10,000uF or better?
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Old 11th May 2003, 11:38 PM   #13
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I think this is how it'd work:

Can someone else comment?
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Old 12th May 2003, 02:27 AM   #14
paulb is offline paulb  Canada
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Quote:
Originally posted by leadbelly
I think this is how it'd work:
Can someone else comment?
Unlikely this will work. You can't create a solid ground reference from two capacitors.
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Old 12th May 2003, 03:17 AM   #15
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with no load the dc out will be your usual ac*root2
if the caps are big enough to charge then supply the current during the missing alternate cycles under load it will stay up close to above but current thru diodes will be at least double the average draw
when the caps run out before the next cycle starts the voltage "ripples" so the average measured by a meter
is lower, depends on the draw

ps paulb is correct - correct reference: the one way symmetric diagram *using only half (ct-one side) of your winding* on the link joensd
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Old 12th May 2003, 03:34 AM   #16
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Hi Chris, I agree with others. 33VAC would be too high after rectification and filter. I built mine with +/- 38 volts and it drive My Apogees Stage without problem. It sound gorgeous on my stages as a matter of fact, though I think you have to mate it with a smooth and laid back, usually Tube and/or non-feedback solid state preamps. It may turn hard with the usual high feedback preamp. You can certainly use just one side of the tap, then use it as a single supply design as in the National Application note. Hope it helps
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Old 12th May 2003, 04:19 AM   #17
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paulb,

Then would adding 2 resistors as a voltage divider suffice to create the split rails?
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Old 12th May 2003, 05:05 AM   #18
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leadbelly, the transformer is already center tapped so i would use the circuit i posted on each tap to make +/- voltage..
i will check the data sheet more, thank for the info

-chris
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Old 12th May 2003, 05:12 AM   #19
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zx3chris,

No, you can't use all 3 taps and have it work. Reread davesaudio's post.

But I would still like an answer to the splitting of a winding question, just to answer it for my own possible use. There have been posts on it, I remember one by Peter Daniel, but I can't find them now.
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Old 12th May 2003, 03:48 PM   #20
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i reread davesaudio's post but i still dont understand wh wouldnt the below circuit work?? using all 3 taps for +/-. i simulated a center tap by tying the two vac sources together
negative voltage has diode in other direction

-chris

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