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The transmitter is designed to be powered with 5V DC. This could come from a mobile phone charger, wall
wart, or even four 1.5V batteries connected in series with a suitable low dropout regulator. However not all
chargers and wall warts are clean enough for powering the microcontroller. Do not use more than 6V: this
may kill the microcontroller; the LCD may not work properly with more than 5V. Best results will be
obtained with a well-regulated and well-smoothed 5V supply.
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