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From: John Larkin <jjSNIPlarkin@highNONOlandtechnology.com>
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
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On Sat, 4 May 2024 14:39:24 -0400, Ralph Mowery
<rmowery42@charter.net> wrote:

>In article <cr6c3jp5f9ed2h20s30v43akt74oh27m8o@4ax.com>, 
>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.