Old analog books usually contains a lot of clever circuits as you pointed out. I like to read them as well. Great video.

That's a really interesting little circuit. I will certainly keep it in mind if I ever need to incorporate a window comparator in a future project. Thanks for sharing.

Wow, the way you explained this was amazing. This is probably the first time I fully understand the concept of window comparators lol. Great job. Thanks!

Wow. Thank you for giving your video to the internet at large for the rest of us to learn from. I really like the way you've changed the visual by updating the values to show the effect of different inputs. Jim WIlliams would be proud.

Seriously, I have found some of the absolute best circuit designs or gotten the most 'ah ha!' moments from older books anywhere from Forrest Mims Radio Shack mini notebooks to stuff like you're showing at the intro! There is always so much to learn in the world and I can't learn enough, fast enough and it drives me crazy 😊 -- anyone else relate to any of the aforementioned? Take care! 😊

You could slide both low and high thresholds to positive (or negative) by just sliding the non-inverting input of the op-amp with a voltage divider (a trimpot).

Once again a wonderful job of explaining the circuit. I always look forward to new additions to your channel.

I used this so many tmes in my projects way back when. Nice to see it's appreciated today. Good to see this today! 😊 :-D

Awesome little circuit. One of your other vids already inspired me to order that book. It looks to be full of goodies. You do a nice job explaining things. Thanks for sharing.

Happy New Year Craig. Another Great Video.

Nicely done Craig, happy new year!

Thanks for the wonderful video clip. Your treatment is quite comprehensive, especially considering you mentioned, at the end, some shortcomings of the circuit. I guess Hysteresis is another one...

Cool little circuit, clearly explained. Thanks for sharing. All the best for 2016

Very well explained useful circuits. Thank you much.

Sadly missed. Come Back :) Great circuit

Wow what a neat circuit and wow a great video you have made! I am a noob but could follow every step all the way, thanks to your step by step understanding method. Maybe a little question, could you not make the comparator more precise by using variable resistors instead of standard value resistors?

I have (or used to have ?) that BB book ! Excellent topic

Nicely explained!

Thanks for the great explanation and clever circuit. You sold me on the idea of looking for some old databooks and reference notes. I've been playing around with the cheap little $2 Chinese dual volt/current meter circuit lately. They only used 1/2 of the LM358 for their current sense amp on the device. That got me looking into ways of creating a crude auto-ranging design using the other 1/2 of the op amp. I never imagined there was a way of using one op amp for a 3 way comparator (mind blown). I don't want to build a dual polarity supply for a circuit like a simple low resolution meter but it's definitely a little circuit I want to try out. As a simple hobbyist myself, I have had a hard time finding examples of simple and easy to understand switching networks that work. I haven't gone through all of your uploads yet (but will shortly). The two places I've struggled with when it comes to switching networks are how to vary the gain to a meter while maintaining linearity, and how to build a switching network for an adjustable linear power supply somewhere between multiple secondary windings of a transformer and the regulator IC. Both are rather simple design elements. I feel like I'm beginning to understand circuit design well enough to figure these out on my own but I could really use a working example instead of learning to design through the magic smoke of failures. I don't expect you to do anything I ask or request or anything like that. I'm not trying to tell you what to create content about. I'm simply trying to relate an area of interest that seems lacking in visual instruction on this platform. Again, I'm just a simple hobbyist. I got into electronics a few years ago after becoming partially disabled. This account is not monotized, nor do I plan on it becoming so. I'm just here to learn and share a thing or two if I come across something interesting. I added this video to my op amp notes playlist and I'm sure I will add many more of your videos to my list of things to goof around with. Thanks again for taking the time to share and explain this circuit to strangers like me. -Jake

Well explained and learn't alot ,Many thanks

Nice circuit. You could use this as a building block for logic circuit with base 3.

you have a way of bringing out the genius in people

Great job, subscribed!

I'd only add that this circuit falls apart under high speed operations, for two reasons. 1. The opamp is being driven into saturation, and it takes time for it to drop from the rail down to 0 volts. 2. Diodes have a capacitance associated with them, which forms a low-pass filter in conjunction with Rin.

Very interesting!. Thanks for the explanation.

great video

Nice circuit indeed. I think the better explanation of the 0.65 V output in the first example would be better started as "the inverting input is held at 0V by the virtual short between the opamp (with feedback path) inputs, and the fact the non inverting input is tied to ground.". It's not set by the diode forward voltage drop, the opamp output is, though.

Mega cool! Thanks.

Thanks indeed!

Happy new year and thanks for sharing. Talking about oldies-but-goodies, do you have other books (beside this and Jim's) that you recommend ?

Maybe instead of using a summing node to offset you can change the non-inverting input to something other than ground?

great! thank you very much, excellent

Very interesting and usefull

why add 2 additional diodes, when you can just change your ground point?

Greetings. I assume the op-amp is operated from +5 / -5.

Is not the inverting terminal at the virtual ground?

Does this circuit really work?? If it does it's amazzzzzing

Shouldn't R1 be replaced by R1 * 0.5 in the Formula with two inputs?

Neat! I would have answered "Use a $0.1 microcontroller with a built-in ADC" :P

How about using a voltage divider (2 resistors) on the non-inverting input? I haven't done the math, but my 'Mark-1' brain tells me that this might obviate the need of the summing network?

amazing =D

From which book is that?

Schmitt trigger input op-amp

The question to test a designer's IQ would be this: if you had no other source other than the battery to be tested for voltage levels, how would you design that circuit for battery level indication?

Up and down step Gleichrichter auch bei höheren Peaks.

So... the equations for E1 and E2 in the book are wrong, the equation for E1 should be for E2 and vice-versa. Also they are missing a (-) sign in front of the R1/R2 term. Right ?

You make simple circuuts look comlicated... I don't know why

I believe the op amp needs a dual power supply. To do the job. Single supply will not do it.

Why would circuits like this be considered "old?. Has something "new" made the obsolete?

Please tell the text book name

Hey could you try this software? Check out androidcircuitsolver on google