http://isisproteus.blogspot.gr/2012/09/isis-proteus.html
http://electronics.forumgreek.com/
http://www.hlektronika.gr/
http://sagoselectronics.gr/
http://kentar.net63.net/index.html
http://www.1728.org/angsize.htm
http://www.vintage-radio.info/heathkit/
http://users.sch.gr/kgiannaras/index.php/mathimata/

Calculators
http://www.electronicproducts.com
http://www.changpuak.ch

Θεωρία
http://www.falstad.com/circuit/e-index.html
http://www.zen22142.zen.co.uk/adt.htm
http://www.qsl.net/va3iul/

Circuits
http://www.circuit-projects.com

Schematics
http://ftp.qrz.ru/pub/hamradio/schemes
http://elektrotanya.com
http://www.eserviceinfo.com
http://www.schematic.tk

Βοηθήματα