This tone board is based on the Atmel Atmega328PU micro-controller, the same microcontroller that the Arduino platform is built on. It generates a PL/CTCSS tone with the level controlled by a 10k pot. Total project cost without the power supply is under $3 with all components sourced via Amazon.
References:
interface.khm.de/index.php/lab...
Негізгі бет Ғылым және технология Homebrew CTCSS tone board
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