http://oh3tr.ele.tut.fi/~oh4mvh/projects.html
standard circuit for adjustable, 3-terminal regulators (LM317, LM350, etc) suffers from a designed-in fault: If the potentiometer R2s wiper loses contact, the regulators output goes high
http://www.edn.com/archives/1994/051294/10di6.htm
http://home.mira.net/~marcop/ciocahalf.htm
illustrates the relative influence of skin-effect and dielectric losses on the characteristic impedance of a lossy transmission line
http://www.edn.com/article/CA245656.html
Only about 1.5mA of DC is needed to turn on and off 400 watts of AC or DC power to a load.
http://www.imagineeringezine.com/PDF-FILES/fetssr.pdf
The circuit uses an inexpensive C-MOS inverter package and a few small capacitors to drive two power MOS transistors from a 12v to 15v supply. Since the coupling capacitor values used to drive the FETs are small, the leakage current from the power line in
http://www.discovercircuits.com/PDF-FILES/fetssr.pdf
This circuit uses a few FETs and logic devices to down convert a DC voltage to about one half its value.
http://www.imagineeringezine.com/PDF-FILES/9vto4v.pdf
Simple circuit that will quadruple +12V input.
http://idt.net/~ljg19/cpump.pdf
with 96% efficiency.
http://www.edn.com/archives/1995/101295/21di1.htm
http://www.qsl.net/kp4md/filter.htm