Free battery 220V~ > =1.5 V

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TRAGAC-otvarac! Tracker-opener!
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http://circuit-zone.com/index.php?electronic_project=12

https://www.pinterest.com/pin/652670171004465516/

https://www.newtoncbraga.com.br/index.php/telecom/16412-radio-vhf-e-fm-transistorizado-art1806

https://www.electronicsforu.com/electronics-projects/simple-fm-receiver