Electronics Infoline Web

8051 Development System Circuit Board

http://www.pjrc.com/tech/8051/board4/schematic.html

8052 BASIC Project

includes IDE interface

http://www.nomad.ee/micros/8052bas.html

80m CW Transmitter

This one-valve (ECL82) CW Transmitter occupies a very special place in my amateur radio history. I was first licensed in 1994 but did not operate on air. I committed to only ever operate equipment which I had made myself.

http://www.hanssummers.com/radio/cwtx/index.htm

80MHz FM Transmitter

http://www.intio.or.jp/jf10zl/fmtx.htm

9 Second Digital Readout Timer

http://ourworld.compuserve.com/homepages/Bill_Bowden/page2.htm#cnt_down.gif

9 Second LED Relay Timer

http://ourworld.compuserve.com/homepages/Bill_Bowden/page2.htm#delay10.gif

9-Line Telephone Sharer

http://www.electronicsforu.com/efylinux/circuit/feb2001/cir1.htm

9-V Nicad Charger by B.J.G. Hamer

Good circuit from the Netherlands.

http://www.uoguelph.ca/~antoon/gadgets/nicad.htm

900-MHz down converter consumes little power

nonproprietary 900-MHz down converter to 75 MHz by using an 825-MHz local-oscillator signal.

http://www.edn.com/archives/1995/062295/13di2.htm

97 x 35 dots graphic LCD interface

This is a small I2C 97x35 dots LCD with integrated controller and LED backlight. You will need these routines to display text or graphics with an 18f452

http://www.techdesign.be/projects/015/015.htm