A weblog focused on interesting circuits, ideas, schematics and other information about microelectronics and microcontrollers.
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Because I have not tested all electronic circuits mentioned on this pages, I cannot attest to their accuracy; therefore, I do not provide a warranty of any kind and cannot be held responsible in any manner.
Frequency meter
Freq meter with 7segment LED display based on the Atmel's AVR90S2313 and three 74HC chips by Jesper Hansen
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. Even with the LED display, the current consumption is less than 50 mA. It counts up to at least 52 MHz. I couldn't find any signal source in the lab that could supply more than 52 MHz, so it may go a bit higher, but the fClock(typ) for the HC590 is about 35-40 MHz, so you shouldn't really count (no pun intended) on more.