4. IC Voltage Regulators

Try these first

1. 1.

   What does the 'XX' in the 78XX series represent?

   Hint

   Think about the numbers that follow the 78.

2. 2.

   Name one application of the 79XX series.

   Hint

   Consider where negative voltage is necessary.

3. 3.

   What output voltage does the 7805 regulator provide?

   • 3V
   • 5V
   • 12V

   Hint

   Remember what the numbers indicate in the part numbers.

4. 4.

   Is the 79XX series used for positive voltage regulation?

   • True
   • False

   Hint

   Think about the type of voltage each series manages.

5. 5.

   Given a circuit needing a 12V power source for a microcontroller and -5V for an operational amplifier, how would you integrate both the 78XX and 79XX series? Sketch the circuit.

   Hint

   Think about how to connect both regulators from a common supply.

6. 6.

   Discuss the failures that might occur if a device is supplied with voltage below its operational requirements due to an incorrectly chosen regulator.

   Hint

   Consider a device's operational range and the repercussions of underperformance.