Building comparator from discrete components?

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Discussion Overview

The discussion revolves around building a simple comparator using discrete components, specifically transistors and resistors. Participants express interest in understanding the basic operation of comparators, with a focus on starting from simpler designs before tackling more complex integrated circuits like the LM393.

Discussion Character

  • Exploratory, Technical explanation, Conceptual clarification

Main Points Raised

  • One participant expresses interest in creating a breadboard version of a simple comparator to gain a better understanding of comparators in general.
  • Another participant suggests a specific comparator circuit (the 139) as a more manageable option for beginners, questioning if there are even simpler alternatives or unnecessary components in that circuit.
  • A third participant notes that a comparator operates based on the principles of a differential amplifier, referencing specific components in a related circuit.

Areas of Agreement / Disagreement

Participants appear to agree on the desire to understand comparators better, but there is no consensus on the simplest design or whether certain components are necessary.

Contextual Notes

There are limitations regarding the assumptions about prior knowledge of circuit design and the specific requirements for understanding comparator functionality.

mishima
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Hi, I'm interested in building a breadboard version of the simplest comparator using transistors and resistors. Ultimately I'd like to understand the LM393 but looking at the datasheet schematic, it seems quite complicated. I was hoping there was a simpler comparator I could mimic to start out with. Thanks.
 
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Like how about this for the 139, it seems more doable/understandable for my skill level:

comp139.jpg


Is there something even simpler? Or is anything in this circuit not necessary for understanding the comparator action?
 
A comparator is based on a differential amplifier. See Q10 and Q13. http://www.allaboutcircuits.com/worksheets/diffamp.html
 
Thanks, that's just what I needed!
 

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