frequency counter with an Atmel At90S2313 microcontroller
It uses only 4 chips - 3 HC TTL’s and an Atmel At90S2313 microcontroller. It has a 5 digit LED display plus one used as a band indicator.the current consumption is less than 50 mA.It counts up to at least 52 MHz.The schematic is quite straightforward. There are two major parts, the display multiplexing and the counter stage.
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