2.3. Astable Mode

Try these first

1. 1.

   What is astable mode in the IC 555 Timer?

   Hint

   Think about 'unstable' states.

2. 2.

   What components determine the frequency in astable mode?

   Hint

   Recall the formula.

3. 3.

   What does astable mode of the 555 timer generate?

   • Continuous low signal
   • Continuous high signal
   • Square wave output

   Hint

   Think about a recurring pattern.

4. 4.

   True or False: Astable mode requires an external trigger to operate.

   • True
   • False

   Hint

   Recall how its operation is defined.

5. 5.

   Create a circuit diagram of a 555 timer in astable mode and specify component values for a frequency of 1 kHz.

   Hint

   Recall the time period formula when choosing your values.

6. 6.

   Explain how changing the value of C would impact the duty cycle of the waveform output.

   Hint

   Think about what happens when you increase the capacitance in a timing circuit.