Electronics > Beginners
RC time constant
electrowhiz:
How to calculate the RC time constant of the attached circuit?
Dave:
http://sim.okawa-denshi.jp/en/CRCRkeisan.htm
You don't have a time constant as such in a 2nd order system, as you would in a 1st order system. What exactly are you trying to accomplish?
bson:
Vc = Vs(1-e^(-t/(RC)))
The RC time constant is the t where Vc/Vs = 1-1/e
For the cascaded case, remember that transfer functions of serial elements multiply.
Dave:
--- Quote from: bson on August 21, 2019, 06:04:47 pm ---For the cascaded case, remember that transfer functions of serial elements multiply.
--- End quote ---
Not quite. The second RC element affects the first one, altering the response. Your statement would be true if there was a buffer amplifier between C1 and R2.
TimFox:
When the circuit is more complicated than a single-pole R-C, the correct questions are what is the rise-time or bandwidth.
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