| ??? 02/07/06 22:17 Read: times |
#109462 - Mmmh, I doubt it Responding to: ???'s previous message |
Charles Bannister said:
Would a 4N35 work? Not really. It has a current transfer rato of 100%, so you have to put in as much current as you take out. This leaves you with the same problem: How to supply enough current from the port pin? Additionally, the 70mA Grant needs to switch is dangerously close to the absolute maximum rating for the 4N35. These things are just not meant to switch 'heavy' loads. Regards, Rob. |
| Topic | Author | Date |
| Powering a peripheral from a pin | 01/01/70 00:00 | |
| well, yes and no | 01/01/70 00:00 | |
| Simple, cheap, small | 01/01/70 00:00 | |
| Thanks Rob | 01/01/70 00:00 | |
| consider adding an RC circuit if ... | 01/01/70 00:00 | |
| Good point | 01/01/70 00:00 | |
| Indeed | 01/01/70 00:00 | |
| Nice solution! | 01/01/70 00:00 | |
| How about 4N35? | 01/01/70 00:00 | |
| Mmmh, I doubt it | 01/01/70 00:00 | |
| Bipolar Transistors | 01/01/70 00:00 | |
| Bipolar Transistors | 01/01/70 00:00 | |
MOSFET | 01/01/70 00:00 | |
| BC327 and 4mA base current | 01/01/70 00:00 |