"Audio is ELF. An audio-frequency circuit still radiates electromagnetic waves, just not very efficiently." Very incorrect in all but perhaps a very few ill-designed products. Most of us responsible for actual RF design don't call possible 'spuriuous emissions of AF energy' over 100 dB down from a 'box' "radiation of electromagnetic waves". Leakage flux perhaps (as from a power xfmr) - but not 'radiation'. I realize I'm addressing a majority digi-head crowd - some of this discussion is only underscoring that point. No offense meant to any digi-head on the list. We couldn't possibly do what we do in the field of RF today without uC's or the talented programmers and designers who actually make those devices 'sing' and 'dance' ... Jim ----- Original Message ----- From: "Martin Peach" To: Sent: Monday, February 11, 2002 11:56 AM Subject: Re: [pic]: Can you amplify with a single 2n2222 ?? > ----- Original Message ----- > From: "Jim" > To: > Sent: Monday, February 11, 2002 12:43 PM > Subject: Re: [pic]: Can you amplify with a single 2n2222 ?? > > > ... > > As to where RF begins - that's easy. Does it involve > > 'radio frequencies' and the technologies classically > > employed to modulate, amplify, detect, filter, > > demodulate or radiate EM energy as opposed to 'audio > > frequencies' which have in past decades normally > > 'modulated' an RF carrier in order to transmit > > intelligence though the ether from point A to point > > B? > > Audio is ELF. An audio-frequency circuit still radiates electromagnetic > waves, just not very efficiently. > > > > > I'm afraid today's 'digi-head' has blurred all > > distinction between the two ... > > The boundary _is_ very fuzzy, but most animals can't hear beyond about > 200kHz... > > /\/\/\/*=Martin > -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads