That;'s a great video! I like how you explained the PLA's combinational logic table.. Your use of the 74ls00 chip as a Quad Set-Reset Latch is lateral thinking at it's best. I want to build one. Well done. I'm surprised I haven't seen this video earlier. Thanks
@@ezContents very creative. A question, how fast do you think is the 7400 chip's switching speed? Only reason I ask is some datasheets say the 74ls279 will switch around 35ns. I use an EPROM solution and the glitch can occur in under 20ns. I think I miss quite a few glitches.
@@eebaker699 Well.. according to the data sheet the propagation delay time of 7400 can be between 3 and 15 ms. But I see that I am using 3 NAND gates in a row for the setting side (S1 and S2). Hard to say... I did not measure the switching speed in the circuit.
Very cool. I always wanted to make one of these. In fact, I had ordered a 74LS279 a while back but never got around to the build -- that's typical for me, sadly. And thanks very much for the shoutout! That was a surprise. You are on a roll with very enjoyable videos. Keep up the great work.
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That;'s a great video!
I like how you explained the PLA's combinational logic table.. Your use of the 74ls00 chip as a Quad Set-Reset Latch is lateral thinking at it's best. I want to build one. Well done. I'm surprised I haven't seen this video earlier.
Thanks
Thank you. I was simply forced to use the NAND chips as I did not have the 74LS279 at hand. :-)
@@ezContents very creative. A question, how fast do you think is the 7400 chip's switching speed? Only reason I ask is some datasheets say the 74ls279 will switch around 35ns. I use an EPROM solution and the glitch can occur in under 20ns. I think I miss quite a few glitches.
@@eebaker699 Well.. according to the data sheet the propagation delay time of 7400 can be between 3 and 15 ms. But I see that I am using 3 NAND gates in a row for the setting side (S1 and S2). Hard to say... I did not measure the switching speed in the circuit.
@@ezContents that's very helpful. I might build one of your S-R latches and see if it's any better. I'll let you know how it goes.😁
Very cool. I always wanted to make one of these. In fact, I had ordered a 74LS279 a while back but never got around to the build -- that's typical for me, sadly. And thanks very much for the shoutout! That was a surprise. You are on a roll with very enjoyable videos. Keep up the great work.
Thank you and you are welcome. I just got inspired by your video and felt that it was little trouble to make this circuit and the video followed.