measuring current through a bf981

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neazoi

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how to measure current flowing through a bf981 which is loaded with drain and source resistors?
also how to measure current if it is loaded with a drain transformer and a source resistor, or with a drain resistor and a source transformer?
 

Hello neazoi,

If you want to measure the DC current, you can measure the voltage drop across the resistor with a normal multimeter. For measuring the AC current, you need a oscilloskop or a multimeter, which can measure the AC voltage across the resitor.

Regards

Rainer
 
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    neazoi

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The datasheet states a 10mA current through the transistor to achieve the lowest noise. I think this is DC current right?
But which resistor, the drain or the source one?
 

If you can explain me why you assume drain and source current of a MOSFET to be different, I'll try to answer the question.
 
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    neazoi

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FvM said:
If you can explain me why you assume drain and source current of a MOSFET to be different, I'll try to answer the question.
Click to expand...

Ok, so it does not matter where to measure it.
Is it DC current I have to measure?
 

Yes I presume you want to measure the DC current.
 

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