| ??? 02/24/06 14:42 Read: times |
#110678 - ALWAYS design to worst case. Responding to: ???'s previous message |
My 15V input to the network is supplied via an open collector output of an inductive switch. When the switch is on, the transistor switches on supplying 15V to the network.
why not just connect the resistor from the open collector output to 5V? I have now settled on using just a voltage devider to drop the voltage, and protection is provided by a 6.2V zener in the place of the 4.7V zener. this should clamp any inputs higher than 6.2V to 6.2V plus the tolerance with a 10% zener the clamp can be as hign as 6.8V. ALWAYS design to worst case. Erik. |
| 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 |