piclist 2017\09\11\084137a >
Thread: Help troubleshooting a JFET circuit.
face BY : James Burkart email (remove spam text)

Hello all!

I am working on a lab for a class and we are given a simple self-biased
N-channel JFET circuit: Rd = 4.7k, Rs = 1k, Rg = 2M, Q1 = 2N4860, Vdd =

Then we are given the scenario: Vds = 66.5mV, Vd = 15V, Vs = 14.9V.

Assuming only one component can be bad, what is the likely problem?

I built the circuit in MPLab and tried everything I could think of to
recreate the voltages, but everything I tried does not work. Shorting Rd
was my first thought, but that also results in Vds being 12.6V. What am I
missing? Can anyone get me on the right track? I have shorted and opened
all resistors, the only thing I can't do (or don't know how to do) is
recreate a faulty FET.


James Burkart
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