Looking at the logical (non-timer) functions of the 555.
http://www.pmonta.com/555-contest/logic/logic.html
http://www.pmonta.com/555-contest/logic/logic.html
By Julian
Youtuber, shed dweller, solar charge controller aficionado
Good morning all…
Youtuber, shed dweller, solar charge controller aficionado
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Subbed by the way glad to run into you . Your in the alley I enjoy
Loved the video, very informative and well done, subbed 👍
fantastic tutorial ! I love it.
You not need to teel me something about compators because Mumbo told.
It's a strange chip. I suppose you could use it as a 15kOhm resistor also. Seems rather wasteful, these alternative uses.
555s are thicc
Sir great to 555 vedio and you great as well. …👍
For the second and subsequent 555s that are used as inverters, wouldn't it be more practical (and cheaper) to simply use a transistor?
I see you are using what look like quality breadboards.
All the ebay ones I have purchased lately are crap.
Warped, bad contacts. These have the mounting screw
holes I see, so at least they lie flat. Where can one get
boards like these?
Having never been taught about this kind of electronics, and having become interested in such things, I've bought lots of bits and pieces to play around with, including a bunch of 555s and LEDs and such. I really needed this explaining rather slowly and I feel like you did a great job in this video! The fog is slowly clearing and I got the latch working, thanks! Though at the moment my led starts "on" when I turn the power on maybe that will change soon. Be well and thanks Julian 🙋😀
I was actually looking at that page about using 555s as logic gates the other day in the hopes of finding a way to use them to make a counter. I just started with electronics a few months ago and haven't got any logic ICs yet, so I've been trying (in vain) to recreate logic circuits with discrete transistors. I was hoping this would be an easier solution for a counter. Even though you can't get NOT Q from the 555's flip flop, you CAN connect an LED from positive INTO the output (with current limiting resistor) and get an inverted output. You can leave the LED going to ground from the output and have both a Q and NOT Q.
Btw the output driver for the 555 is called a totem pole output. I'd been wondering about it myself for ages and randomly came across a wiki article on totem pole outputs and realized it's what they use on the 555 so I began reading more on it. Thanks for taking the time to post this. Now I think I'm gonna binge watch some more of your videos.
I find a quad 2 input nand Schmitt to be a much more flexible device than a 555.
…couple of things…The output driver IS inverting (and a bit hefty). Also it is NOT a good idea (esp with CMOS floating around in odd ways) to leave pin 4 (reset) open–simply run a wire to the nearest gnd or pin 8.
A couple of things that may be of interest: I once designed (for a contest-
"DESIGN IDEAS", IIRC) a –true-sine wave oscillator based on the 555 with the frequency AND amplitude adjustable and totally independent, one pot did not (in any way) interfere with the others (freq. and amp. control). This was a contest by "Radio Electronics" magazine in the late 80's–the prize was a VERY nice circuit board holder. I wound up trading it for a HUGE resistor kit.One more thing worth mentioning: The digital version of this–using the 555 (actually the 556) as a pulse train generator with the frequency and duty cycle (adjusted with a pot for each) TOTALLY independent of each other…simply drive an astable (oscillator) with one unit, connected to trigger the other unit configured in monostable mode (pulse gen.) settable to any desired pulse width, and you have a rectangular pulse with totally independent freq. and duty cycle control. BTW, it is not difficult to configure a 555 with a virtual 0% to 100% duty cycle…OH!, I seem to be rambling–sorry-'later…'