17-08-2012, 12:22 PM
Report on Voltage Regulator
1Voltage Regulator.pdf (Size: 23.32 KB / Downloads: 323)
In your robot, the energy is derived from batteries. Specifically,
there are two sets of batteries wired up to act as voltage sources; a
9V battery, and two 1.5V batteries in series that act as a 3V source.
Since different circuits in your robot require different voltage
sources, it is not always possible to hook up the battery directly to
power the circuits. The ICs in your robot circuit are designed to
work with a constant 5V source. Therefore, it is important to convert
the 9V source into a 5V source. Since a DC voltage (one that is
fixed over time such as a battery) is being converted to another DC
voltage, the circuit that does this is called a DC-to-DC converter or
a voltage regulator. If we were to convert 110V AC (alternating
current - like the power in a wall outlet) into a 5V DC source, the
circuit would be an AC-DC converter.
Background
In this lab, you will build the voltage regulator circuit which converts
the 9V batteries output into a constant 5V voltage source. The
circuit has already been designed for you. Your task will be to build
and test its operation. You will also do some experiments that will
allow you to develop an understanding of how the circuit works.
The voltage regulator circuit consists of 5 different components; a
9V battery, a resistor, a diode, a transistor, and a capacitor. You
may wish to review the description of the operation of these components
in the Lab Guide. The circuit you will be building is shown in
Fig. 5.1 . The pin out for the transistor is shown in Fig. 5.2 -