Hello...My name is Aaron and I'm a student @ ITT and I was just hoping for a little bit of input regarding a project......Ok, so We have to Build a frequency meter with LEDs for the BCD code also a 2 digit 7 segment display using a step down Transformer 120 VAC to 12 VAC for the input. I have 2 7447 Decoder drivers leading into my segment displays.....I was thinking of using 2 7490 Decade counters for my circuit going to my decoders....the max. Hz input will be 60 Hz, I also have LEDs paralleled between the counters and Decoders.......My question is: can you tie the 7490 counters together to have 2 outputs of 4 (1 from each) I have a 20 MHZ crystal for my 7490s as well....is that too much or OK.....