will take a 12V RMS sinusoidal input from a transformer and provide a 10V DC output at 100 mA with very good regulation
http://www.ee.washington.edu/circuit_archive/circuits/ee332/design.html
use a current mirror and a power MOSFET to increase the output-current capability of an IC-voltage regulator
http://www.edn.com/archives/1996/020196/03di5.htm
outputs regulated 9V DC
http://www.geofex.com/Article_Folders/Spyder/spyder.htm
certain electronic circuits require extremely low-noise power supplies and this circuit provides very good quality power output
http://www.edn.com/archives/1997/010297/01di_03.htm
http://www.repairfaq.org/sam/samschem.htm
100-mA regulator that uses a dual linear-regulator IC to produce output voltages below 1.25V from 2.9 to 5.5V input-voltage range
http://www.edn.com/archives/1997/010297/01di_05.htm
http://www.tkk.fi/Misc/Electronics/circuits/psu_5v.html
This is an example of a power supply to power anything requiring 5 volts DC. This circuit takes low voltage AC in (9-16V AC).
http://www.mrollins.com/pwrsp3.html