| ??? 05/23/06 14:06 Read: times |
#116924 - smps/linear ps. |
I am communicating with pc using 89c52 on rs232 port using max232.The everything works fine when power is given from smps.
But when on board linear power supply comprising of a rectifier and 7805 is used , though the circuit works (that is concluded fromt he port pin status and ale signal) communication part doesn't work. what might be going wrong? |
| Topic | Author | Date |
| smps/linear ps. | 01/01/70 00:00 | |
| the moon is in the 3rd quarter | 01/01/70 00:00 | |
| Post circuit diagram | 01/01/70 00:00 | |
| Break of GND line? | 01/01/70 00:00 | |
| Maybe he's forgotten the caps? | 01/01/70 00:00 | |
| Any connection to Phone line ? | 01/01/70 00:00 | |
| Have you examined the linear PS? | 01/01/70 00:00 | |
| one caveat | 01/01/70 00:00 | |
| granted, but that's a misapplication. | 01/01/70 00:00 | |
| his question is why does it fail with 78 | 01/01/70 00:00 | |
| True enough, but until he does the work | 01/01/70 00:00 | |
| as usual | 01/01/70 00:00 | |
| Natural enemy | 01/01/70 00:00 | |
| Quite true, Kai | 01/01/70 00:00 | |
| You are experienced, I see... | 01/01/70 00:00 | |
| I just wonder | 01/01/70 00:00 | |
| When I need a clean signal | 01/01/70 00:00 | |
| but then you have to clean up | 01/01/70 00:00 | |
| Fuse in secondary circuit. | 01/01/70 00:00 | |
| Fuses | 01/01/70 00:00 | |
| Slow-blo? | 01/01/70 00:00 | |
Yes, but... | 01/01/70 00:00 | |
| schematic | 01/01/70 00:00 | |
| no schematic here ... ??? | 01/01/70 00:00 |