4.1. 78XX Series

Try these first

1. 1.

   What is the output voltage of the 7805?

   Hint

   Think of the number indicated in the model.

2. 2.

   What kind of devices often use 78XX series regulators?

   Hint

   Consider which devices need stable power.

3. 3.

   What output voltage does the 7805 provide?

   • 12V
   • 9V
   • 5V

   Hint

   Think of the model number.

4. 4.

   True or False: The 7812 outputs 5 volts.

   • True
   • False

   Hint

   Recall the output specifications.

5. 5.

   Design a simple power supply circuit using both a 7805 and a 7812 to power a microcontroller and a sensor. Explain how the output can be stabilized.

   Hint

   Consider how each part of your circuit requires different voltage levels.

6. 6.

   If a load connected to the 7805 requires 500 mA and the input voltage is 12V, calculate the power dissipation in the regulator and discuss heat management strategies.

   Hint

   Think about how heat is generated and how it can be dissipated.