| ??? 10/01/10 19:18 Read: times |
#178839 - Re: Responding to: ???'s previous message |
Per Westermark said:
What is the reason you want to isolate the relay coil? Does the relay coil get power from some external power source? No, the relay coil get the supply from the same instrument itself but what i am making is a industrial type conroller. The MCU circuit has 3V, and the relay output [and 4-20mA analogue output] circuit has 12V power supply. it is good to isolate input analogue circuitary from the output circuit. People prefer the input and output circuitary to be isolated. [to avoid grouding loops noise etc. ] |
| 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 |