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Old 9th February 2013, 10:24 AM   #1
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Default Is this Gonna Work?!?

Hi All

I have come up with this design for a filtered and regulated PSU.

Really looking for pointers suggestions and the like.

Quite new at this so any suggestions would be really great.
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Old 9th February 2013, 10:32 AM   #2
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Looks good. Just a couple of comments:

Nice touch to snubber the primary - but make sure the caps are rated for the PEAK value! Probably easier to snubber at the secondary though, you get some free attenuation from the transformer.

What current should this provide? 2 x 10kuF seems excessive and will result in quite high-and-short charge current pulses with lots of harmonics.

In the regulator you use the pot as a rheostat. That's fine but I would connect the bottom pin to the wiper. That way, if the wiper fails, it will not be open.

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Old 9th February 2013, 10:40 AM   #3
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Hi Jan

It needs to put out about 3 amps at 12v.

To be honest I just happen to have the 10KuF Caps so thought I'd use them!

What would you recommend?

I'll connect the wipper as suggested.

I assume when you say 'snubber' you mean the mains filter before the primary? Should I just move all of that over to the secondaries?

Many Thanks


Last edited by NeilParbrook; 9th February 2013 at 10:42 AM.
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Old 9th February 2013, 10:42 AM   #4
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Another thing I was thinking of doing was duplicating the regulator circuit to give me two 12v 3 amp outputs.
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Old 9th February 2013, 11:02 AM   #5
Mooly is offline Mooly  United Kingdom
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You could usefully put a snubber across the secondary, perhaps 0.1uf and 2.2 ohm. Keep the primary ones.

Large reservoir caps is one my concerns in many many designs. I did a brief explanation only this morning, post #12,
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Old 9th February 2013, 11:20 AM   #6
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So...Like This???
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Old 9th February 2013, 11:36 AM   #7
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To split it to two outputs instead of doing it as above should i split it at the secondaries with two rectifiers etc?
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Old 9th February 2013, 11:51 AM   #8
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If each separate secondary can supply the needed amperage, you could duplicate the snubber and bridge and everything after. Paralleling the secondary as shown saves parts and real estate. I'm not sure it makes significant difference either way; separation may have the edge if the loads are wildly different.
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Old 9th February 2013, 11:57 AM   #9
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The Loads are Identical. Two Identical Amps! I'll leave it as it is.
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Old 9th February 2013, 12:39 PM   #10
Ketje is online now Ketje  Belgium
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Perhaps something like this I don't no if all that snubbering has much use.
By using two diodes there is less loss and thereby less heat from the rectifiers.With the currents in the same direction in the toroidals there is no saturaion of the core,more inductance left.
Why KF ,for a meter you don't use Kmm do you.So KF is simply mF .
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