Hi, my name is thamil, and i need to hand in a paper on an egg timer circuit by next week. I'm kinda stuck here. I need to design a test circuit that will illuminate an LED for 180 seconds (3minutes) after a switch has been asserted. This circuit as given in the question should incorporate 74LS163 counters plus any other logic/flip-flops that may be required with a clock supplied at 1 Hz using a 555 timer. I already have the 555 timer circuit that supplys a 1 Hz frequency but the problem is i'm unable to design the circuit with 74LS163-s and flip-flops. Can anybody help me please! I'm really desperate. I can't find the design of this circuit and also the explanation part. Pls help me. Site links to this circuit diagrams or diagrams of the circuit itself will be much appreciated. Thank you. Moderator removed email link and request for sending circuit privately. We insist on questions being handled in the public forums.