Path: ...!Xl.tags.giganews.com!local-1.nntp.ord.giganews.com!nntp.supernews.com!news.supernews.com.POSTED!not-for-mail NNTP-Posting-Date: Sat, 04 May 2024 20:08:46 +0000 From: John Larkin Newsgroups: sci.electronics.design Subject: Re: AM radio law opposed by tech and auto industries is close to passing Date: Sat, 04 May 2024 13:06:59 -0700 Organization: Highland Tech Reply-To: xx@yy.com Message-ID: References: <49fhgkxdv5.ln2@Telcontar.valinor> X-Newsreader: Forte Agent 3.1/32.783 MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Lines: 29 X-Trace: sv3-kG7yTDgDewsCqQpShNukeM4x5O5xsbFUNwxJV+prtVve6itJiH3EQVgEwCW/quYZWj1j3dc+TWbCxhk!clA9STKNfqQtm48nOHKGux1Ii67oVk0G9GanfP873wOB5UNcDt1qeJuftWdXzXvZXmvDoNW3eo37!hVfpxw== X-Complaints-To: www.supernews.com/docs/abuse.html X-DMCA-Complaints-To: www.supernews.com/docs/dmca.html X-Abuse-and-DMCA-Info: Please be sure to forward a copy of ALL headers X-Abuse-and-DMCA-Info: Otherwise we will be unable to process your complaint properly X-Postfilter: 1.3.40 Bytes: 2196 On Sat, 4 May 2024 14:39:24 -0400, Ralph Mowery wrote: >In article , >jjSNIPlarkin@highNONOlandtechnology.com says... >> >> I suspect I can light an LED from local RF fields. Gotta try that some >> time. Free illumination! >> >> >> >> >> > >I do not know about the LEDs but the older florescence tubes would light >up if close enough to an transmitter. > >I have seen plans for a simple transistor receiver that was hooked up to >another antenna that was used to power it if close enough to the local >transmitter. > A crystal set can be very loud in a city, near an AM station. Must be milliwatts with a longwire antenna. Some clever circuit might harvest several stations. A good LED is visible in room light at 1 uA, just over a uW. And barely visible in the dark at 1 nA.