| ??? 04/11/06 13:20 Modified: 04/11/06 13:25 Read: times |
#114075 - Of course! Responding to: ???'s previous message |
Erik said:
why not use one with two outputs ? Yes, of course. He would need a rather weak 9V winding for the 5V supply and a stronger 18V winding for the relays. Or a 18V transformer with center tap. But I would use a transformer with one 18V winding, rectify about 24V from this for the relays and use a step down switcher like LM2674 to fabricate the 5V. (I just realized, that Suresh isn't needing a 12V supply voltage at all.) Kai |
| Topic | Author | Date |
| step up voltage regulator | 01/01/70 00:00 | |
| 12V rectified output? | 01/01/70 00:00 | |
| additional Transformer occupies space | 01/01/70 00:00 | |
| 18V Center Tap Transformer? | 01/01/70 00:00 | |
| size ? | 01/01/70 00:00 | |
| Mistake in analysis | 01/01/70 00:00 | |
| why two? | 01/01/70 00:00 | |
| Of course! | 01/01/70 00:00 | |
| easier | 01/01/70 00:00 | |
| You are righ Kai. I didnt analyse this w | 01/01/70 00:00 | |
| nope, that is why it is called a switche | 01/01/70 00:00 | |
| Step-up, step-down | 01/01/70 00:00 | |
| ON/OFF(active low) pin? | 01/01/70 00:00 | |
| Shutdown pin | 01/01/70 00:00 | |
Thanks. | 01/01/70 00:00 | |
| Try this simple circuit. It might work | 01/01/70 00:00 | |
| LM2577 | 01/01/70 00:00 | |
| expensive is relative | 01/01/70 00:00 | |
| Charge pump | 01/01/70 00:00 | |
| Thank you all | 01/01/70 00:00 | |
| Two are needed! | 01/01/70 00:00 |