In the previous post, a very simple current amplifier circuit was introduced. This post expands on that just a little bit adding a second transistor to the circuit, amplifying the current it another fold.
“Want more current?”
Say if the controlling device (in this case the POT) has a very very weak signal, like a microcontroller and you wanted to power a heavy duty DC motor, you’ll need more current. We can add another transistor to amplify the signal to a much higher amount of current. This also amplifies the small signals, when you just start turning the POT knob, the motor doesn’t start moving until the knob has turned a certain amount. This may change in this circuit. You may use less effort in the turning to make the motor move since the current is amplified on a whole new scale due to the newly added second transistor.
