http://www.botzilla.com/photo/strobeVolts.html

http://lullaby.homepage.dk/diy-camera/usoft.html

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

http://support.nikontech.com/app/answers/detail/a_id/886/session/L3NpZC9JYlVTT1JNag%3D%3D/kw/compatibility/p/88%2C152/c/178/r_id/116678/sno/1