| ??? 10/01/10 19:26 Read: times |
#178843 - no Responding to: ???'s previous message |
Assume PC817 "C " - with minimum tranfer ratio==200% .
50mA/2 = 25 mA in best case. But - You should specify "C" grade - You should ensure these 25 mA For me this is unacceptable solution for instrumental devise. If You choice 5 mA LED current , minimal quaranteed output of any PC817 is 2.5 mA . And this current is enough to switch on any P-N-P transistor , which will drive relay. If optoisolator is needed at whole.... regards |
| Topic | Author | Date |
| PC817 for isolation + driving relay? | 01/01/70 00:00 | |
| Why isolate relay coil? | 01/01/70 00:00 | |
| Re: | 01/01/70 00:00 | |
| Optos don't actually "isolate" from a EMC point-of-view... | 01/01/70 00:00 | |
| ......... | 01/01/70 00:00 | |
Star point grounding and filtering... | 01/01/70 00:00 | |
| PC817? | 01/01/70 00:00 | |
| Is LED current of 5mA is sufficient? | 01/01/70 00:00 | |
| no | 01/01/70 00:00 | |
| A darlington? | 01/01/70 00:00 | |
| SSR? | 01/01/70 00:00 | |
| RE: "book by Bosshcart " | 01/01/70 00:00 | |
| RE: "book by Bosshcart " - Link | 01/01/70 00:00 |