Solar Powered Night Light

for the details of this project visit

http://www.solorb.com/elect/solarcirc/snl1/index.html

voltage inverter

voltage inverter

for this project details visit

http://www.aaroncake.net/circuits/vinvertr.asp

voltage doubler

voltage doubler
for this project details visit
http://www.reconnsworld.com/power_voltdoubler.html

unregulated PSU

for this project details visit
http://www.zen22142.zen.co.uk/Circuits/Power/unreg.htm

Student DC Supply

for this project visit
http://www.kmitl.ac.th/~kswichit/dcsupply/supply.html

gyrator circuit

for this project details visit
http://www.zen22142.zen.co.uk/Circuits/Power/gyrator.htm

TTL Power Supply with "Crowbar" protection

for this project visit

http://www.electronics-lab.com/projects/power/006/index.html