EEVblog #941 – The Amazing Schmitt Trigger

Fundamentals Friday
What is a Schmitt trigger and how does it work?
What is hysteresis?
And how do they fix two common problems in electronics, namely slow slew rate signals on CMOS digital chip inputs causing oscillation, and noise on comparator inputs.
The issues are demonstrated first on the breadboard, then the whiteboard explanation, and then the hysteresis fix is added and demonstrated.
And how are Schmitt Triggers physically implemented in CMOS logic?
Forum HERE

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5 comments

  1. Bit disappointing that you didn’t show the classic single-BJT Schmitt trigger

  2. I am amazed to see so many people unaware of this so well done for the video, Dave. It is one of the most fundamental things to tackle with practical digital electronics. I may have missed you mentioning it, but did you mention the importance of digital supply decoupling with regard to minimising switching oscillations?

  3. Hey there! I’ve been reading your blog for a while now and finally got the bravery to go ahead and give you a shout outfrom Atascocita Texas! Just wanted to say keep up the greatjob!

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