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Old 13th September 2013, 02:25 PM   #21
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Originally Posted by KatieandDad View Post
You need to address the transformer before you think about the caps. The transformer is just not adequate in this circuit unless you dispense with the regulator.
I can do just fine with +-25 to +-27 voltage output at 5A. Click the image to open in full size.
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Old 13th September 2013, 02:25 PM   #22
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3 x 4700uF per rail will work well if you dispense with the regulator.

If you want to persist with a regulated supply you will need a higher voltage transformer.
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Old 13th September 2013, 02:29 PM   #23
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Remember the transformer has some regulation too. Let us assume it is around 7% at the stated 480VA...
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Old 13th September 2013, 02:34 PM   #24
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You could use a CRCRC PSU to drop a few volts.
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Old 13th September 2013, 02:50 PM   #25
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You could use a CRCRC PSU to drop a few volts.
I pretty much appreciate your advice but a variable regulated split power supply will give much versatility in powering low to medium power chip amps don't you think.
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Old 13th September 2013, 02:52 PM   #26
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What part of this are you not reading. Your transformer is too small to feed a regulated supply.

It would be suitable for a 24V regulated supply at its VERY BEST. That would require massive pre-reg capacitors in order to keep the pre-reg ripple under the Vin requirement of the regulator.

Last edited by KatieandDad; 13th September 2013 at 02:57 PM.
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Old 13th September 2013, 03:01 PM   #27
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Originally Posted by sghr220 View Post
I can do just fine with +-25 to +-27 voltage output at 5A. Click the image to open in full size.
Quote:
Originally Posted by KatieandDad View Post
What part of this are you not reading. Your transformer is too small to feed a regulated supply.

It would be suitable for a 24V regulated supply at its VERY BEST.
What part of this are you not understanding? I repeatedly stated that i don't need a FULL 30v, and about the 24v or the 18v that's you guessing right?
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Old 13th September 2013, 03:04 PM   #28
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I give up. Try doing a bit of homework.
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Old 13th September 2013, 03:09 PM   #29
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I give up. Try doing a bit of homework.
Try some etiquette will you?
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Old 13th September 2013, 03:11 PM   #30
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You have 2*24VAC at 480VA
You have therefore 2*36VDC at no load condition.
This drops to 2*33VDC at full transformer power.
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