Hobi zarada

Opamp741 makes high-pitch crystal sound

1km-fm-transmitter-with-ua741-opamp-2--L1 coil - 4 turns of 1 mm copper wire (wired on a pen)

http://electronics-diy.com/1km-fm-transmitter-with-ua741-opamp.php

http://electronics-diy.com/ba1404-fm-stereo-transmitter-with-amplifier.php

https://www.maartenbaert.be/simplescreenrecorder/

https://www.youtube.com/watch?v=6xrFTDoOIZI

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https://www.it-klinika.rs/blog/napad-na-android-pomocu-malicioznih-konfiguracionih-poruka