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A comment on Sony develops energy harvesting module from electromagnetic wave noise. Parent comment
https://zynthian.org
Or Mod DUO:
https://mod.audio/mod-duo/
.. can both do what you want, and a ton more to boot - I know you specifically asked for simple and cheap - well, these devices are cheap and .. amazing ..
https://zynthian.org
Or Mod DUO:
https://mod.audio/mod-duo/
.. can both do what you want, and a ton more to boot - I know you specifically asked for simple and cheap - well, these devices are cheap and .. amazing ..