Is there any body answer my Q?

A

alifitness

New Member

• Feb 10, 2015

• #1

I want to know how we can create a negative voltage using potentiometer.
please don't use formula ,just explain it in detail with real direction of electrons.
tnx

 

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kubeek

Well-Known Member

Most Helpful Member

• Feb 10, 2015

• #2

Note that Vgg is connected backwards, thus supplying negative voltage to the potentiometer to start with.

 

crutschow

Well-Known Member

Most Helpful Member

• Feb 10, 2015

• #3

Your thread title tells us nothing. Next time use a title that tells us something about your problem.

A potentiometer can't "create" a negative voltage from a positive voltage. It can only affect the value of voltage that you have.
If you really need a negative voltage then you will have to use a switching inverter supply to generate that.

What's the purpose of the negative voltage?
Is it to bias the transistor gate?

 

A

alifitness

New Member

• Feb 10, 2015

• #4

the purpose of negative voltage is getting this

 

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crutschow

Well-Known Member

Most Helpful Member

• Feb 10, 2015

• #5

To generate a reverse bis for the gate-source junction of an N-JFET a resistor is often placed from source to ground, then the drain-source bias current generates a positive source voltage with respect to the gate (giving a negative Vgs).

 

atferrari

Well-Known Member

Most Helpful Member

• Feb 11, 2015

• #6

Be kind with those that could help you. Next time, like this.

 

H

Honduras

Member

• Feb 12, 2015

• #7

Center tapped transformer? Maybe rail splitter?