| ??? 11/17/04 08:36 Read: times |
#81354 - simplest power on/off Responding to: ???'s previous message |
hi,
If you talk about MCU then most of them have idle/sleep/power down modes to save power. When you press a key then MCU come ups from power down mode, performs button debounce and does power on/off for rest of scheme. If we talk just about an idea so the simplest way I see is something like that: Here the first half of 7474 does debounce of switch SW1 and second half of chip does on/off function. RC net provides state OFF when standby power applies. Anyway, you should provide standby power for either MCU or scheme above. Regards, Oleg |
| 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 |