| ??? 11/25/04 19:59 Read: times |
#81959 - Voltage sensing Responding to: ???'s previous message |
Hi Apa At,
If all you want to know is that the 230 Vac is hot, I'd go with a step down transformer. Step the voltage down to a low voltage, rectify it, and feed it through a series resistor and zener (5V zener of course). The transformer should provide you with sufficient isolation. If you want both a belt and suspenders (a local colloquialism for redundant safety), add an optoisolator to the mix. If you add a large filter cap to the mix you can protect against false triggers due to brown-out conditions, unless you want to know about brown-outs. |
| Topic | Author | Date |
| 230V AC Monitoring | 01/01/70 00:00 | |
| Re: 230V AC monitoring. | 01/01/70 00:00 | |
| More questions | 01/01/70 00:00 | |
| reply | 01/01/70 00:00 | |
| Use an optocoupler | 01/01/70 00:00 | |
| Why opto? | 01/01/70 00:00 | |
| picture | 01/01/70 00:00 | |
| Mains detector | 01/01/70 00:00 | |
| "Mains"detector | 01/01/70 00:00 | |
| Earlier detect | 01/01/70 00:00 | |
Re: Earlier detect | 01/01/70 00:00 | |
| Why opto? | 01/01/70 00:00 | |
| Opto | 01/01/70 00:00 | |
| Capacitive Divider | 01/01/70 00:00 | |
| A word of warning | 01/01/70 00:00 | |
| Reply | 01/01/70 00:00 | |
| Voltage sensing | 01/01/70 00:00 | |
| Step down transformer | 01/01/70 00:00 | |
| Danger! | 01/01/70 00:00 | |
| Peak and RMS: Andy | 01/01/70 00:00 | |
| What? | 01/01/70 00:00 | |
| 230 Vrms | 01/01/70 00:00 |