Electronic coin jar

sparkyIVXX said:

I am working on an electronic coin jar. I am using an ir led to detect an inserted coin and 7490 decade counter into a 7447 bcd to seven seg. Decoder. The problems i am having are figuring out how to count by multiples of 5, 10, and 25. And how to tell the difference between the coins.

Any help at all would be helpful.
Thanx

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