| ??? 02/08/06 00:09 Read: times |
#109466 - Bipolar Transistors Responding to: ???'s previous message |
Thanks. That's an interesting discussion. This is a battery powered device so I want to keep "secondary" currents to a minimum. We have a legacy approach here using a couple of transistors and it consumes about 4mA to keep the transistor on. I'd like to do much better if possible. I realize that's not much compared to the 70mA, but we need to eek out as much battery life as possible (which is why we are turning the 70mA beast off in the first place -- since it's not needed all the time).
And in answer to your question, in this case I'd like to switch the supply not the ground. |
| 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 |