| ??? 02/23/06 10:27 Read: times |
#110570 - Resistor values Responding to: ???'s previous message |
Hi,
I was thinking of using a 2K ohm connected to the +15V supply in series with the 1K ohm connected to ground. This should idealy give me a 5V drop across the 1K resistor and hence the the 4.7V zener in parallel with it. This 5V should be enough to switch on the zener clamping the output to 4.7V. Even if, due to resistor tolerances, the output is less than Vz (4.7V), and the zener does not switch on, the output still should be enough to provide a high to the TTL input. Am I correct? Thank you for your time sun |
| Topic | Author | Date |
| Zener Turn-on-time | 01/01/70 00:00 | |
| Remedy | 01/01/70 00:00 | |
| Thank You Kai | 01/01/70 00:00 | |
| Divider | 01/01/70 00:00 | |
| Resistor values | 01/01/70 00:00 | |
| Read again my calculation example | 01/01/70 00:00 | |
| drop that stupid resistor to ground | 01/01/70 00:00 | |
| can you draw the schematic? | 01/01/70 00:00 | |
| Assistance required to post Sch | 01/01/70 00:00 | |
| If using "Windows" | 01/01/70 00:00 | |
| Typo Oops | 01/01/70 00:00 | |
| Using a cap is enough | 01/01/70 00:00 | |
| actually for the "typical" use it is not | 01/01/70 00:00 | |
| Less than 1nsec | 01/01/70 00:00 | |
| Resistor instead of the cap | 01/01/70 00:00 | |
| Sch | 01/01/70 00:00 | |
| ALWAYS design to worst case. | 01/01/70 00:00 | |
| Homepage | 01/01/70 00:00 | |
| why is that 1k still there | 01/01/70 00:00 | |
| Aha! | 01/01/70 00:00 | |
Thank you all for your help. | 01/01/70 00:00 |