Drift Correction for LC oscillator
http://members.ziggo.nl/cmulder/ksbstabi.htm
PIC Frequency Counter with Frequency Lock function
http://www.qsl.net/om3cph/counter/lcd/contribs/pic_flck.htm
Linear scale analog watt meter
http://kd1jv.qrpradio.com/lspwmtr/linear_analog_SWR_meter.HTM
Home made 20m HF SSB Transceiver
http://www.webx.dk/oz2cpu/20m.htm
Lineare QRP a MOSFET
http://www.qsl.net/ik4auy/article_4.htm
http://martein.home.xs4all.nl/pa3ake/hmode/
H-Mode mixer