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Old 15th January 2015, 04:37 PM   #21
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Eldam
This is a fairly simple program to model the front end of a power supply.
PSUD2

It will show the DC voltage output, over time, after you enter in the circuit parameters.
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Old 15th January 2015, 04:53 PM   #22
Eldam is offline Eldam  France
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Thank you Rudy,

I already use it while not understood all (self lake of knowledge). But can this soft take into acount some exceptions : like my only 11.3 VAC at secondaries output with my 9 V R-core ? I mean here it's less than x 1.41 !

Have to say than after I don't understand all the curves ! while able to read the results with numbers....

Good idea, will re test it ! must be somewhere at home on a XP pc ! If it shows the VDC & AC peak to peak it will be enough as the R-core is below a torroid in relation to the results: my understanding is this design was maid for torroids.

Last edited by Eldam; 15th January 2015 at 04:56 PM.
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Old 15th January 2015, 05:49 PM   #23
soekris is offline soekris  Denmark
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Quote:
Originally Posted by Eldam View Post
Thank you Rudy,

I already use it while not understood all (self lake of knowledge). But can this soft take into acount some exceptions : like my only 11.3 VAC at secondaries output with my 9 V R-core ? I mean here it's less than x 1.41 !

Have to say than after I don't understand all the curves ! while able to read the results with numbers....

Good idea, will re test it ! must be somewhere at home on a XP pc ! If it shows the VDC & AC peak to peak it will be enough as the R-core is below a torroid in relation to the results: my understanding is this design was maid for torroids.
The sqrt 2 multiplier to get peak voltage from RMS voltage is the same no matter what trafo. I personally prefer toroids as they're usually smaller, with better load regulation, with significant smaller inductive field and less noisy. But you can use any trafo meeting the specs minimum spec.
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Old 15th January 2015, 05:55 PM   #24
Eldam is offline Eldam  France
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Thanks Soren.
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Old 15th January 2015, 05:59 PM   #25
Bones13 is offline Bones13  United States
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I found a 10VA toroid with 2x 7v secondaries (Antek) - is the 10VA going to be too high?

Could you a 14-16 volt center tap secondary transformer? Hook up the center twice on the Soekris board?
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Old 15th January 2015, 06:08 PM   #26
Eldam is offline Eldam  France
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Ah, this time I can answer (I hope !) : 10 VA is what is absorbed by the traffo not by load.

Dangerous for the traffo if the load ask more than the traffo can give only.

Here this is not the case as it seems the load needs 5 W so 5VA or maybe better to say 7.5 VA peak to peak (technicians will rectify if I'm wrong) ?

So with more than 7.5 VA you are good. Some says than traffo between 30 VA and 50 VA are the quietest...

There are some direct links in the Vendor thread for torroids in the official thread.
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Old 15th January 2015, 06:12 PM   #27
TNT is offline TNT  Sweden
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10VA is what the trafo can provide to the load (not what it "absorbs" as this would mean that all went into heat). So it can't be to high really, only to low.

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Old 15th January 2015, 07:12 PM   #28
Eldam is offline Eldam  France
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Harghhh !

I was believing it was what the seconadry which is "absorbing" in continue this VA capacity due to its winding while the load can takes its own need into this limitation !

Ok, i come back to lego and saucepans this time ! This night I melt all my devices to makes a frying pan and come back to the kitchen where the place of a french is !
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Old 16th January 2015, 03:13 AM   #29
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To reduce the risk for some DIYers, probably Sokries could recommend one or two "official" third party trafos for this DAC on the front page?
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Old 16th January 2015, 05:21 AM   #30
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Originally Posted by rredline View Post
To reduce the risk for some DIYers, probably Sokries could recommend one or two "official" third party trafos for this DAC on the front page?
There are two multicomp transformers sold by Newark/Farnell/Element14 that have been suggested in the Vendor thread.

2x7AC 7VA (cheaper and 20 in stock)
MCFM70/07 - MULTICOMP - TRANSFORMER, TOROIDAL, 2 X 7V, 7VA | element14 Australia

2x7AC 5VA (more expensive and currently out of stock)
MCFM50/07 - MULTICOMP - TRANSFORMER, TOROIDAL, 2 X 7V, 5VA | element14 Australia

The links are to the Australian website but it's easy enough to change location using "Change Country" at the top right of the page.

The 2x7AC 5VA is also available from a UK based seller on eBay (more than 10 in stock)
MCFM50 07 Multicomp Mini Toroidal 5VA 2X 7V | eBay
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