Oct 13, 2014 · The 74LS190 doesn't have a reset, but it does have a parallel load. You can wire the parallel load to act like a reset. Ground all the parallel inputs, P0 thru P3. Then, since the parallel load is active low, wire the output of the AND gate through a …

Feb 25, 2016 · I have a really simple circuit, a 2-digit decade counter (0 to 99) using two 74LS190s. It works fine when counting upwards (0 .. 9, 10 .. 19, etc), but when going downwards, it seems to decrement the

Feb 4, 2016 · You can start with 74LS190 up/down counter, then 74LS47 BCD to 7-Seg decoder then to a common anode 7-seg display LED. Google for the above datasheet and start designing. Allen

Dec 11, 2014 · Hello everyone. We have a 3rd semester project to do. It goes something like this: Design a parking lot with 12 spots. When a car enters, the counter must count up and when one leaves, it must count down. Also, if the lot is at it's limit, the entry gate should remain closed even if …

Jan 11, 2025 · I used 74ls190 and 74ls47. I put a nand gate for zero detection and connected it to the load pin. I have achieved the 55 seconds but how can i start it to a new preset if it goes 00. ( 55-00-30-55 ) the sequence i want to have, a help would be appreciated, this is our finals exam.

Oct 26, 2022 · I'm trying to make a countdown timer with the 74LS192 IC. I've already figured out how to set the time but, when the 1st cycle finishes, it loops back to start. Any Suggestions?

Nov 16, 2009 · , design a two-digit decimal counter that counts from 00 up to 59. The 74LS190 should be used for the units stage (least significant decimal digit) and the 74LS163 for the tens stage.

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Mar 15, 2012 · Hello. I am a sophmore in digital electronics and at the moment we are making a "Now Serving" display, which is 0-99 counter using 74ls193 circuts to digital boards. Now, i was able to get the main project done, we have an extra credit oppurtunity if we can make the 74ls193 circuts be a able to...

Jul 11, 2015 · Hi everyone! I am currently working with a 60-second UpDown counter for our project in traffic light system. I am using two 74LS190 as the counter, two 74ls47 as the decoder and one 74ls00 whose output is connected to the load of the second 190 ic. Everything worked properly when I simulated...