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From: Jan Panteltje <alien@comet.invalid>
Newsgroups: sci.electronics.design
Subject: Re: Ultra-Low Power Operation
Date: Mon, 07 Oct 2024 07:38:39 GMT
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On a sunny day (Mon, 07 Oct 2024 00:49:06 +0100) it happened Cursitor Doom
<cd@notformail.com> wrote in <2986gjp50ja0hqo7nd3b4tgfd1m7s7ectp@4ax.com>:

>On Mon, 7 Oct 2024 00:26:01 +0200, Lasse Langwadt <llc@fonz.dk> wrote:

>>> Where can you buy a half volt battery?
>>
>>a zinc and a copper nail in a lemon? ;)
>
>Again, lots of ways to make batteries. We found all this fascinating
>when we were children, but kids today just don't seem to give a damn
>about it.

You can use a Pleltier module and heat it up with body heat to get low voltages.. 
Or power it and use it to cool something:
 https://www.ebay.com/itm/404626611006
 https://www.ebay.com/b/Peltier-Coolers/182022/bn_16565367