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# how to find value of dv/dt in a simple amplifier circuit

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#### hasnain shahid

##### Newbie level 2
what is dv in at = dv/dt

sir

i make a simple audio amplifier cirucit in my circuit out point has 3.5 volt dc and 10 miliampare now i used a capacitor at this point but i dont know the capacitnace value of capacitor which i used at this point

u can help me

i know
c=q/v
q=it
i=dv/dt
how i find the dv/dt value in my case plz explain with calcultaions however i used understand it and use accurate capacitor capacitance at out point

i will be thankfull to u

i=dv/dt

Sooner or later you need to measure something.

You might begin with shorting the output to ground,
with a MOSFET as switch, measuring the actual output
limited-current value; then release the FET and get
the rise time and voltage difference between two
points that appear on roughly linear portion of the
curve. That will give you a close dV/dt, you will have
a measured i, this will yield a c value from which
you should subtract jig and FET (datasheet) capacitance.

Or you desolder the cap and put it onto a C-meter,
if its markings are truly that illegible.

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