www.beotel.yu/~zristic
www.mikroelektronika.co.yu
solair.eunet.yu/~branek
www.el.co.yu
www.radioklub.co.yu
www.itcelectronic.co.yu
www.monselektronik.co.yu
www.solorb.com/gfc/elect
e-www.motorola.com
www.analog.com
www.irf.com
www.philips.com
www.maplin.co.uk
www.microchip.com
old.hi-fi.ru
www.velleman.be
www.ee.washington.edu/circuit_archive/circuits
www.angelfire.com/ab3/mjramp
www.sci.fi/~ijl