| ??? 11/18/04 08:23 Read: times |
#81432 - Another power on/off technique Responding to: ???'s previous message |
This is a technique I use quite successfully.
Connect a PNP pass transistor emitter between the battery + and Vcc of the circuit to control. Base of the transistor is connected to the micro port pin. To turn on the circuit, you need to press the On button which is nothing but a switch between the transistor collector and emitter. Once the circuit is on, the micro can decide on shutting it off. For this, all it needs to do is raise the control pin (Base) to high logic. (0 - on / 1 - off) Jerson |
| Topic | Author | Date |
| How to turn ON/OFF power!! | 01/01/70 00:00 | |
| RE: How to turn ON/OFF power!! | 01/01/70 00:00 | |
| pwr on/off a device with shared input | 01/01/70 00:00 | |
| RE: pwr on/off a device with shared input | 01/01/70 00:00 | |
| RE: pwr on/off a device with shared input | 01/01/70 00:00 | |
| RE: pwr on/off a device with shared input | 01/01/70 00:00 | |
| Schematic / Demo available below | 01/01/70 00:00 | |
| RE: Schematic / Demo available below | 01/01/70 00:00 | |
| Any comment on the about circuit? | 01/01/70 00:00 | |
| RE: Any comment on the about circuit? | 01/01/70 00:00 | |
| RE: Any comment on the about circuit? | 01/01/70 00:00 | |
| RE: How to turn ON/OFF power!! | 01/01/70 00:00 | |
| I agree with Charles | 01/01/70 00:00 | |
| simplest power on/off | 01/01/70 00:00 | |
| Another method | 01/01/70 00:00 | |
| it was an example | 01/01/70 00:00 | |
| it was an example | 01/01/70 00:00 | |
| Another power on/off technique | 01/01/70 00:00 | |
| Yet alternatively | 01/01/70 00:00 | |
My own method of this... | 01/01/70 00:00 |