C2 charge injection on oscillation startup equalizes pulse length
| Authors | Stephen Woodward |
| Main Document | Article «Gated 555 astable hits the ground running» |
| Description | Figure 4 |
| File Format / Size | PDF / 9 Kb |
| Document Language | English |
Other Materials from the Main Document
- Article «Gated 555 astable hits the ground running»
- Figure 1. Typical gated (via RESET pin) 555 astable multivibrator
- Figure 2. Excessively long first pulse occurs on oscillation restart due to C1 complete discharge
- Figure 3. Added timing capacitor C2 immediately precharges C1 to V+/3 trigger level when RESET returns high normalizing the duration of the first oscillation cycle
- Figure 4. C2 charge injection on oscillation startup equalizes pulse length
- Figure 5. A buffer may be necessary to provide a full voltage excursion RESET signal
