Today I made a power supply module, to save me adding the same set of components almost every time I knock up a new circuit...
It implements a simple 5V supply, taking power either from a 2.1mm DC jack (e.g. from a WallWart) or from a 2-pin "Molex" header (e.g. from a Battery) and regulating with a 78L05...
![](http://2.bp.blogspot.com/_71-IkTH3uDw/TOVunMFuD2I/AAAAAAAADeU/SWOfRcp_X-o/s400/Schematic.jpg)
In truth, I power stuff under development from bench PSUs (current limiting is such a good idea for the accident-prone) but I still find it simpler to have local voltage regulation on the board - saves messing around with knobs and voltage adjustments!
Notice the little LED to remind me when power is present.
Here's the finished board...
![](http://3.bp.blogspot.com/_71-IkTH3uDw/TOVuzDEr3ZI/AAAAAAAADec/KcrAISuRI9k/s400/PSU.jpg)
The power supply joins an increasing collection of such "PlugIn" modules I've made over the years - usually to interface a connector or switch to the breadboard without the use of flying leads (which always live up to their name and fly off in my experience).
Here's some of the family...
![](http://2.bp.blogspot.com/_71-IkTH3uDw/TOVvQq14KxI/AAAAAAAADek/oW3sxQw01VM/s400/Range.jpg)
There's an FCC68 break-out (used to connect the Microchip ICD2 to a PIC project under development on the Breadboard - although I tend to use the PICKit 2 nowadays - not least because of simplicity in connection!) and two flavours of switch - one "upright" and one in a more laid back posture.
I'm going to add some more modules - perhaps my favourite QRP linear amp (as previously seen in the Radio Times amplifier) and some other RF building blocks.
...-.- de m0xpd
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