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 Forum index » DIY Hardware and Software » Developers' Corner
does this psu work?
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krabbacitor



Joined: Aug 13, 2009
Posts: 12
Location: Hamburg

PostPosted: Thu Mar 25, 2010 9:21 am    Post subject: does this psu work? Reply with quote  Mark this post and the followings unread

hello there!

i would like to build a power supply (again...), the schematic is attached to this post.
since i have drawn it with eagle, which i never used before, there are some things missing. the filter caps are 1000uF, caps on the outputs are 10uF, or 0,1uF respectively.

i intend to allow not more than 40 or 50 mA from each output, so i would like to limit the current to this level. where should i put this current limiting?

and do you think, this design is ok?

regards,
christian


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fonik



Joined: Jun 07, 2006
Posts: 3759
Location: Germany
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PostPosted: Thu Mar 25, 2010 10:47 am    Post subject: Reply with quote  Mark this post and the followings unread

AFAICS it will work. however, i wonder why do you want to limit the current?
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matthias
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krabbacitor



Joined: Aug 13, 2009
Posts: 12
Location: Hamburg

PostPosted: Thu Mar 25, 2010 11:01 am    Post subject: Reply with quote  Mark this post and the followings unread

thanks for your prompt answer, matthias!

actually i don't really WANT to limit the current, just wondered how it would be done if i use those regulators.
and since i'm not that proficient i'm always fearing that i'm about to toast a circuit...
oh, and i would like to avoid the need for unnecessary large heatsinks
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fonik



Joined: Jun 07, 2006
Posts: 3759
Location: Germany
Audio files: 23

PostPosted: Thu Mar 25, 2010 11:08 am    Post subject: Reply with quote  Mark this post and the followings unread

how much current you suck will depend on the load, i would have thought. so as long as the load draws 40mA, there will be no need for big heatsinks - just guessing, you would have to do some calculations about that. i believe there has been a thread in the common DIY section, that covered that...
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krabbacitor



Joined: Aug 13, 2009
Posts: 12
Location: Hamburg

PostPosted: Thu Mar 25, 2010 12:16 pm    Post subject: Reply with quote  Mark this post and the followings unread

ok, thanks again

i just thought of it as a safety measure if i happen to produce a short circuit

cheers
christian
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