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 Forum index » DIY Hardware and Software » Thomas Henry designs
21st Century Power Supply.
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Sound



Joined: Jun 06, 2006
Posts: 842

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PostPosted: Mon Mar 03, 2008 11:13 am    Post subject: 21st Century Power Supply. Reply with quote  Mark this post and the followings unread

Hello,


I have some questions about the 21 century synthesizer power supply schematics.

One of them was if I can achieve +/- 12v only replacing the 7815& 7915 regulator chips by 7812 & 7912, Tim has answered me that yes. It is not needed to change any value of the others of components.

But now I'm thinking that I need two little power supplies (+/- 12- +/- 15 for check circuits breadboards, So , I don't need 1.5A.

In the case that I use a transformer of 0.14A, do I need to change the values of the capacitors? Can I use the same circuit?


http://www.hammondmfg.com/pdf/5C0010.pdf

This is the transformer that I choose for PCB mount there are different values: look 183f36 .183k36

Other question
is if I must connect the ground of the power supply with the ground of the line cord.




thanks.
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factus10



Joined: Jun 20, 2007
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Location: Buffalo, NY

PostPosted: Mon Mar 03, 2008 7:36 pm    Post subject: Reply with quote  Mark this post and the followings unread

No, don't change the capacitor values. I haven't seen a schematic of Thomas's power supply but if it's like the standard design (and others he's designed) they help smooth the voltage to the regulators.

You really should consider a bigger transformer. 140ma (the power your supply could provide) isn't a lot ... and you'll get less after the regulators...
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Sound



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PostPosted: Wed Mar 05, 2008 2:39 pm    Post subject: Reply with quote  Mark this post and the followings unread

thaks factum, I think that I will do the same that on the schematics.
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