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246 CounterThe 74HC393 is a dual 4 bit TTL counter the two sets can be combined and with some tricky wiring you will be able to make it count only even numbers, but I will use a PIC12f675 MCU a small 8 pin device and with some very easy programing you will be able to count odd or even numbers, for more info on the last contact me by E-mail or my website http://www.patenttrade.net

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Easy.

A four-bit counter counts from 0 (D1-D4 all low) to 15 (D1-D4 all high). If you only want it to count 0, 2, 4, 6, 8, 10, 12 and 14--IOW all the numbers where D1 is low--just ground D1 and run the clock twice as fast as you normally would.

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