[sdiy] Power Supplies in electronic-sea.net :)

[Oscar Salas]

Hello Dylan,

P0 and P1 are block terminals (pitch spacing 5mm).
Each block terminal is for one secondary.
The transformer is a toroidal with two secondaries, 15VAC each.
Commercial transformers that will work, for example:
http://catalog.block-trafo.de/prodvardatasheet/2883629-4063514_EN
http://www.vigortronix.com/gallery/products/specification-142.pdf
http://www.farnell.com/datasheets/79607.pdf

The current rating of the transformer must be at least 1.8 times the power
supply output current. So for example to output 1A: 1.8*1=1.8;
1.8*30V=54VA. So the transformer must be at least 54VA, the closest
standard size is 60VA. However I advise to derate it to 80VA. So, you can
use, as a rule of thumb, the factor 2.7 times the output current to choose
the transformer.

I hope this answers your question. Please, do not hesitate ask anything
regarding the power supply.

Regards,
http://electronic-sea.net/power_supply.html

> Thanks for sharing! I have some very beginner level questions on the
> transformer.  I have done a very limited amount of work with transformers
> that mostly consist of me bring US 110AC down to 12V or less for VFD tube
> projects I have been experimenting with.  The transformers have 3 wires (2
> that can be combined for maximum secondary output, and a third negative).
>
> Is it 30V AC getting split between P0 and P1, and what does the physical
> layout of the secondary winding coming off the transformer look like in
> terms of the hook up to P0 and P1.  If possible, can you link to a
> commercial transformer that would work for this so I can see visually what
> I would be doing.
>
>
>
> On Sat, Mar 31, 2012 at 6:33 AM, Oscar Salas
> <osalas at electronic-sea.net>wrote:
>
>> Hello everybody,
>>
>> 1)I'm glad to present my site, where I'm publishing my DIY synth
>> work:electronic-sea.net
>>
>> 2)The last months I was studying the Power Supply. I developed one power
>> supply based with the well known LM317/LM337 regulators and another,
>> high
>> efficiency power supply, using LDO MIC2941 regulators.
>>
>> Both are designed to be assembled to a rear panel, but also, they can be
>> assembled to a heat-sync.
>>
>> You can download schematics and PCB layouts here:
>> http://electronic-sea.net/power_supply.html
>>
>> Soon I will release some writings regarding the power supplies.
>>
>>
>>
>> Oscar.
>>
>>
>>
>> _______________________________________________
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>> Synth-diy at dropmix.xs4all.nl
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>>
>


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