| ??? 09/21/09 15:14 Modified: 09/21/09 15:18 Read: times |
#169016 - Thoughts... Responding to: ???'s previous message |
Health Warning: High voltages can be lethal! Inexperienced users should not try this at home!
Michael Karas said:
I do not want to use the conventional 18K 4Watt resistor and 4N35 opto coupler due to the heat build up. Could you use a "capacitive dropper" instead? Edit: You might even be able to get enough "pickup" by just wrapping a few (insulated) turns around the "switched" wire... Or maybe use a neon as the light source, and an LDR or whatever to build your own "high-voltage" opto...? (not sure how that might fit with "small" and/or "low cost") |
| Topic | Author | Date |
| Detecting AC voltage..... | 01/01/70 00:00 | |
| Thoughts... | 01/01/70 00:00 | |
| ring-detector? | 01/01/70 00:00 | |
| The voltage range appears to be in the same ball-park | 01/01/70 00:00 | |
| In old systems ... some of which are still in use ... | 01/01/70 00:00 | |
| Don't use a relay | 01/01/70 00:00 | |
| I was thinking optocoupled triac driver ... | 01/01/70 00:00 | |
| Capacitor or Relay | 01/01/70 00:00 | |
| Capacitive dropper | 01/01/70 00:00 | |
| I used it for a long time in traffic lights controllers | 01/01/70 00:00 | |
| Capacitive Dropper | 01/01/70 00:00 | |
| Ideas Appreciated | 01/01/70 00:00 | |
| Strobed measurement to minimize heat dissipation | 01/01/70 00:00 | |
Clever Concept | 01/01/70 00:00 |