That's what prompted the question -- there must be a relatively simple tunnel diode circuit that can be used. But there's no technical details or schematics on that site. I also thought about using one of MAXIM's tiny (TSOC or SOT23) ISM band downconverters, and then smoothing out their still AC output with rectifier/caps. -marc On 2/4/05 10:59 AM, "Alex Harford" wrote: > On Fri, 04 Feb 2005 10:47:56 -0500, Marc Nicholas > wrote: >> Can anyone give me some guidance on a *simple* circuit for detecting 2.4Ghz >> microwave (Wifi etc.) and providing DC output? It wouldn't have to be >> terribly sensitive and I'd prefer it to be pretty passive :-) > > There was just such a project on Slashdot yesterday: > > http://neil.moon-beam.com/users/kris/index.htm > > Alex -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist