Custom voltage regulator

 It's cheep and easy to buy a voltage regulator than building your own.

But just for  curiosity , let's build a voltage regulator using Toshiba C5168

A Toshiba C5168 is commonly used in Audio Amplifier circuits. It's high breakdown voltage is 140 V and current of 10A. The 10A of current it can handle makes it ideal since we will be using voltage divider .

If  we have a voltage source of 22 dc voltage , and we are going to be driving a brushless motor of 12 v. We will need a regulated voltage of 12v from 22v and still providing enough current to the motor.

 Using this voltage divider formula ( V_out = V_in × (R₂ / (R₁ + R₂)), (Vout = 22 x(8k ohms / (6k ohms + 8k ohms)). This will give us theoretically 12v. 

When we connect voltage divider to an LED for testing , it will light up. But when connected to a  brushless motor, nothing happends coz, the motor not only require 12v to run it also needs alot of current where the voltage divider cant provide due to the high resistor values used.

We can use resistors with lower values but they will heat up and breakdown. So the need of a transitor.

 Voltage  applied to the Base by the voltage divider will flow from Base to Emitter.  This means the transistor won't allow more than 12v to pass throug it's Base Emitter points. Hence ensuring that Our load will only get 12v when connect on the Emitter point.

 And Collector is connected to high power supply to ensure there is enough current ( Collector Emitter current ) flowing to the load.

As seen from the above image, the voltage divider provide needed voltage of 12v on the base of the transistor and the collector pulls in the necessary current as per the load demand.

(NOT YET TESTED)

As i was writing this i thought , what if i used a mosfet to do the samething. I will definitely be trying out this. But am thing the Mosfet won't be able to regulate voltage from the Drain to its Source . As I used a mosfet to drive a relay of 24v yet it's get was only receiving 5v   DC.