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Old 22nd May 2008, 04:18 AM   #1
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Default powersupply design question

will this design work?

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Old 22nd May 2008, 04:41 AM   #2
sneih is offline sneih  Indonesia
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i think it's great idea..... but still waiting the answer from others
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Old 22nd May 2008, 06:27 AM   #3
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Since that's a dual secondaries transformer, why don't you use dual rectifiers? See photo.

Hey, the big caps can be nice, but you might want to add a pair of 2200uF or 3300uF. Those charge/discharge fast. Refer to CarlosFM 2004 design.


Oh yes, here's a dual rectifier photo.
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Old 22nd May 2008, 06:57 AM   #4
Mooly is offline Mooly  United Kingdom
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Hi,
Depends what you mean by work. It will give -/+25 volts DC. Is that what you want ? You need diodes with a high surge current rating for big caps like those and with at least a 100 volt P.I.V. rating.
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Old 22nd May 2008, 08:02 AM   #5
glennb is offline glennb  Australia
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Make sure the phasing of the transformers is correct otherwise it will just be a paralleled half wave rectifier. ie. the ripple frequency will be the mains frequency rather than double the mains frequency.

You have taken one step towards improving the basic PS design. The 10nF across the diodes cuts out most of the switching noise. The next step is adding some film caps across the main reservoir caps, anything from 0.1uF to 10uF is typical. There are many more steps beyond...
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Old 22nd May 2008, 08:39 AM   #6
AndrewT is offline AndrewT  Scotland
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use a light bulb for the first power up.
and again every time you modify the project.
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Old 22nd May 2008, 10:11 AM   #7
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Yes, my target was to get +/- 25volts powering up my split supply amp. But is there any difference between single supply and split supply amp?

I build a chip amp TDA2005 with a single supply, would it make any difference with a split supply design?

ok, now this bridge diode, i believe any 5amp rating bridge should suffice, would it? as for the filter caps, usually 2200uF 50v would be ok.
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Old 22nd May 2008, 10:11 AM   #8
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as suggested, i've revised the schematics:
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Old 22nd May 2008, 10:14 AM   #9
AndrewT is offline AndrewT  Scotland
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Diode ratings?
use dual 35A installed inside a bridge rectifier. i.e. two each way.
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Old 22nd May 2008, 10:17 AM   #10
AndrewT is offline AndrewT  Scotland
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+-25V and 2200uF smoothing does not sound right for an 8ohm speaker.

The peak current into a resistive load is [Vpsu-Vloss]/Rload~=[25-4]/8=2.6amps peak.
Into a reactive speaker load the peak current can be two to three times this value i.e. approaching 7Apk.
The ripple on 2200uF will be enormous.
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