WJEC GCSE Electronics C490QS · C2.2(e)
The 555 astable timer: period and mark-space ratio
- Code
- C2.2(e)
- In
- C2.2 Timing Circuits
- Topic
- C2 Component 2: Application of Electronics
- Course
- GCSE Electronics C490QS
- Board
- WJEC
Grade boundaries·WJEC command words
Codes and titles are read by a script from WJEC's published specification and have not been checked by a person. What each point covers is in the specification itself: WJEC’s specification.
Points in C2.2 Timing Circuits
- C2.2(a) Time delays from RC networks
- C2.2(b) Charging and discharging capacitors in RC circuits
- C2.2(c) Changing the time delay of RC timers
- C2.2(d) The 555 monostable timer
- C2.2(e) The 555 astable timer: period and mark-space ratio
- C2.2(f) Measuring astable output with an oscilloscope
- C2.2(g) Frequency and mark-space ratio equations for 555 astables
- C2.2(h) Circuit diagrams for 555 monostable and astable timers