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 Forum index » DIY Hardware and Software » The layout factory
Simple 78xx (Positive)and 79xx (Negative) Power Supply
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Gaetano_AU



Joined: Oct 08, 2011
Posts: 49
Location: Australia

PostPosted: Thu Jan 10, 2013 4:05 pm    Post subject: Simple 78xx (Positive)and 79xx (Negative) Power Supply
Subject description: A Simple Power Supply using a easily available protoboard.
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I needed a simple fixed dual rail power supply for a project, so I made this on a stripboard. I used a 'Stripboard - Small': Part Code: 'STPBRD2' which you can easily get from Futurlec.

http://futurlec.com/Protoboards.shtml

or

http://www.futurlec.com.au/ProtoBoards.jsp

To give credit where it's due. After I finished it, I opened Thomas Henry's books which I just received, and the first thing I saw was the power supply, in 'An Analog Synthesizer for the 21st Century'. So I added Diodes D7 & D8 for further protection.

All diodes are standard Silicon 1N4004.


Parts Overlay with Heatsinks Reverse.jpg
 Description:
The underside of the board with heat-sinks and the regulators vertically mounted.
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Parts Overlay with Heatsinks Reverse.jpg



Parts Overlay with Heatsinks.jpg
 Description:
With heat-sinks and the regulators vertically mounted as the board is quite small, you can pull a larger current. I would in addition put some extra tinned wire underneath where needed. In an etched PCB the tracks would be thicker there.
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Parts Overlay with Heatsinks.jpg



Parts Overlay Reverse.jpg
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Parts Overlay Reverse.jpg



Parts Overlay.jpg
 Description:
If you do not want to pull a large current say < 200mA, you can just lay the regulators flat or for 100mA use 78Lxx and 79Lxx 100mA regulators, but the TO-220 versions are more robust and about the same cost (shown here).
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Parts Overlay.jpg



General Purpose Power Supply (150dpi).GIF
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The Schematic
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General Purpose Power Supply (150dpi).GIF



Last edited by Gaetano_AU on Sat Apr 20, 2013 1:41 am; edited 5 times in total
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baudrate



Joined: Mar 19, 2012
Posts: 26
Location: Utah

PostPosted: Fri Jan 11, 2013 9:39 am    Post subject: Reply with quote  Mark this post and the followings unread

Would it be a good idea add heat sinks to the 78xx and 79xx?
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Gaetano_AU



Joined: Oct 08, 2011
Posts: 49
Location: Australia

PostPosted: Fri Jan 11, 2013 5:28 pm    Post subject: Reply with quote  Mark this post and the followings unread

Yes if you pull a large current, say you wanted to use > 200mA on each rail, I definitely would. I mentioned that under 'Parts Overlay', where if you did do this you would probably also need to run heavier wires underneath to the diodes and out from the regulators as you approach 1A. Otherwise you don't need to for a few filters. For a few low power circuits, you could actually use 78Lxx and 79Lxx 100mA regulators, but I don't see the point in using these, when these TO-220 1A versions are about the same price, and way more robust.
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mirri



Joined: Mar 29, 2009
Posts: 13
Location: Finland

PostPosted: Wed Apr 17, 2013 3:57 am    Post subject: Reply with quote  Mark this post and the followings unread

Hello and thanks for this, i noticed a small error i think? D7 seems to be connected to a strip that isn't used. Or did i understood the schematics incorrectly?

/m
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PHOBoS



Joined: Jan 14, 2010
Posts: 1794
Location: Moon Base
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PostPosted: Wed Apr 17, 2013 5:14 am    Post subject: Reply with quote  Mark this post and the followings unread

you're correct, if you look at the bottom view then top of D7 needs to be soldered in one strip lower (or you could connect the two together).
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Gaetano_AU



Joined: Oct 08, 2011
Posts: 49
Location: Australia

PostPosted: Wed Apr 17, 2013 5:27 am    Post subject: Reply with quote  Mark this post and the followings unread

Yes, it was a sort of typo, D7 has now been fixed on the board overlays above. The circuit works fine, it was a prototype for a simple +-10v PCB board I later made for a MiniMoog VCF Clone.
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mirri



Joined: Mar 29, 2009
Posts: 13
Location: Finland

PostPosted: Wed Apr 17, 2013 5:29 am    Post subject: Reply with quote  Mark this post and the followings unread

Ok, thanks!
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