Voltage divider:
The voltage divider is a circuit that allows us to achieve lower voltages (Vout = Output Voltage) from another voltage (Vin = Input Voltage)For voltage division to happen, there must be 2 resistors in series (on the same line) connected to the motherboard ground (as you can see in photo). How to calculate the voltage division? The Output Voltage (Vout) is calculated using a simple mathematical formula, see below:
In photo below there is a voltage divider in the circuit:
I made some colored drawings in this part of the schematic to get a better understanding, let's see:
- In orange is the voltage division formula.
- The input voltage of the circuit (19V) and the output voltage of the voltage
divider (8.14V) are marked in black.
- In red are the two resistors in series connected to the motherboard ground.
- The ground is marked in green.
As we can see in the schematic diagram, resistor 1 has a value of 200K and resistor 2 has a value of 150K
Example:
Vout = 150/350 x 19
Vout = 8,14V
The voltage found in this case between the two resistors connected to the ground is 8.14V, which will supply terminal 4 of the two input Mosfets (PQ101 and PQ103).
