Voltage divider

186

02:58:54

Helpful if you don't have potentiometer.
If you want fixed voltage for a particular circuit you can use two resistors to divide the voltage.(If your supply is 5v and you want supply of 3v  or any value for another circuit  from the same 5v you can use voltage divider)
Vo=R2/R1+R2×Vin
You know the value of Vin and Vo i.e, input and output voltage.
Assume R2 and you will get the value of R1.
In this simulation  R2=330.

published 10 years ago

Chryseus

10 years ago

Keep in mind a load will cause the voltage to drop since the output impedance is 1 / ( (1/R1) + (1/R2) ) so this circuit is only usable at very low load current, or with small resistors which dissipates a lot of power, a load impedance of 10x the divider is usually fine.

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