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Binary counter

I haven't built any electronic gizmos like this in 10 years. I don't know what possessed me to make this, other than binary is geeky and blinking LEDs are cool.

 

It's strangely transfixing to watch it count.

 

The "brain" is a 74HC590 8-bit counter. The clock is provided by the 555 circuit in the corner of the board.

 

Currently displaying the number 245. It takes approximately one minute to overflow.

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Taken on September 25, 2007