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2answers
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Should analogue multivibrator and comparator pullup circuit have separate supplies?

I have managed to produce a design within the falstad circuit simulator for an analogue "LED chaser" using an analogue multivibrator and 3 comparators inspecting the voltage of one side of the ...
2
votes
2answers
699 views

How can there even be an input voltage on a long-tailed pair?

Assuming the following: The voltage across the base-emitter junction of a BJT is constant in forward-active and saturation mode The BJTs in a long-tailed pair are normally forward-active or saturated ...
1
vote
1answer
180 views

BJT schmitt trigger has linear behavior on negative swings

I am currently building a VCO for an analog synthesizer. The circuit produces a triangle wave by taking a Schmitt trigger output and feeding it into an integrator. The constant output of the Schmitt ...
4
votes
3answers
3k views

Help understanding BJT voltage comparator

I'm trying to understand how a transistor voltage comparator works. For example I've been studying this LM339: comparator circuit diagram http://lc.fie.umich.mx/~a0686696c/Materias_files/Lab.Elect....