Switched 7805 Replacement
A small PCB the size of a TO-220 case containing a PWM voltage regulator to replace the classic 7805 by a more efficient regulator and with better ripple suppression.
In a recent project I've used a "7805" with the following specification:
input 100-220 V. AC
output 5V.DC 1A.
It's a simple battery charger for mobile phone. No need for power transformer, rectifier, filter capacitor....
It cost less than 3 euros.
I obtained also a 5V+-0.25V 2A for less than 10 euros.
Have a look at http://www.murata-ps.com/data/meters/dms-78xxsr.pdf
I use them for my 7805 replacements.
A possible smaller 78L05 replacemant with SOT23-chip.
With layout and assembly...
The circuit itself could be very handy for new projects, without the need to fit all the components in such a small space. Is there a layout for a single sided PCB?
Here are three ICs to convert to 5 volt. Look in the datasheet and create a adaptor PCB. Components are available at conrad.com or farnell.com. I guess that you can find more DC/DC converters.
LT1776 0.4A 7.4--40V
LT1176 0.8A 10--35V
L4978 2A 8--55V