Post

Got an odd one today. A 74LS08 AND gate connected to a 74LS92 decade counter. Gate 3 of the AND outputs to pin 14 of the counter. One of the inputs to gate 3 is a clock signal, the other is low. Therefore the output MUST be a clock. But it isn't. I've swapped both chips to no avail. Trace time!

Stand down everyone. I didn’t read the datasheet correctly. The second input must be high, and in this case it isn’t. Fault is further back in the circuit. Bugger.

0 reposts3 likes

No replies yet.