# 7mA Bias Current

#### krispiekream

##### Newbie level 4
I have a 7mA Bias Current here.
What values of R541 and R542 can I use to make it a 10mA Bias Current?
What formula can I use? which law was it.
thank you

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#### KlausST

##### Super Moderator
Staff member
Hi,

Please post a link to the datasheet of the IC or device.
Or post a photo of the circuit where we can see details about the IC marking (100kBytes should be sufficient)

Klaus

#### krispiekream

##### Newbie level 4
or how do we get 7mA bias current given the circuit below is the question?

#### KlausST

##### Super Moderator
Staff member
Hi,

If you can post a part of the datasheet, why not give a link to the complete datasheet as requested?

Klaus

#### d123

Hi,

i) Iset x R542 = xyz voltage
ii) xyz voltage/R541 = Ibias current

e.g.

i) 10uA x 34k = 0.340V
ii) 0.340V/49.9R = 6.81mA

Ohm's Law.

#### d123

Hi again,

For anyone interested, a similar/identical device is the LT3092: Isource = 10uA x (Rset/Rout)