2014年10月13日 · 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 …

2016年2月25日 · 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

2016年2月4日 · 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

2025年1月11日 · 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.

Their names would be "74ls90" and "74ls190". The lettering before and after that is just to let you know what kind of chip it is. Like weather it's a surface mount or through hole, etc. This is based on my minimal understanding of these chips. Here is where I figured that

2009年11月16日 · , 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.

2015年7月11日 · 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...

2022年10月26日 · 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?

2024年8月3日 · I am an electronics newbie looking to design an LED flashing circuit with a counter that initially counts from 0 - 9, then counts from 9 - 0. My initial thought process is to have a flip-flop mechanism that triggers when 0 reaches …

2014年12月11日 · 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 …