Circuit Documentation

Summary

This document provides a detailed overview of a circuit designed to control a DC motor using a rotary potentiometer and a TIP120 Darlington transistor. The circuit is powered by a 9V battery. The rotary potentiometer adjusts the base current of the transistor, which in turn controls the current flowing through the DC motor, thereby adjusting its speed.

Component List

1. Rotary Potentiometer

   • Description: A variable resistor used to adjust the base current of the transistor.
   • Pins: leg1, wiper, leg2
   • Properties:
     • Resistance: 10,000 Ohms

2. TIP120 Hi-Current Darlington Transistor

   • Description: A high-current transistor used to control the DC motor.
   • Pins: BASE, COLLECTOR, EMITTER

3. DC Motor

   • Description: A motor that is controlled by the transistor.
   • Pins: pin 1, pin 2

4. 9V Battery

   • Description: Provides power to the circuit.
   • Pins: +, -

Wiring Details

Rotary Potentiometer

• leg1 is connected to the positive terminal (+) of the 9V battery and pin 1 of the DC motor.
• wiper is connected to the BASE of the TIP120 transistor.
• leg2 is connected to the negative terminal (-) of the 9V battery and the EMITTER of the TIP120 transistor.

TIP120 Hi-Current Darlington Transistor

• BASE is connected to the wiper of the rotary potentiometer.
• COLLECTOR is connected to pin 2 of the DC motor.
• EMITTER is connected to the negative terminal (-) of the 9V battery and leg2 of the rotary potentiometer.

DC Motor

• pin 1 is connected to the positive terminal (+) of the 9V battery and leg1 of the rotary potentiometer.
• pin 2 is connected to the COLLECTOR of the TIP120 transistor.

9V Battery

• + is connected to leg1 of the rotary potentiometer and pin 1 of the DC motor.
• - is connected to the EMITTER of the TIP120 transistor and leg2 of the rotary potentiometer.

Code

There is no microcontroller code associated with this circuit.