| ??? 12/08/05 22:15 Read: times |
#104919 - my mistakes... Responding to: ???'s previous message |
Again Kai,I thank you a lot for your detailed answers.
I would never recommend to put an 1R resistor in parallel to a ferrite choke, because then the impedance of this effective filtering element (parallel circuit of resistor and choke) could only be smaller than 1 Ohm! That should be a misunderstanding of me reading different posts.You know a terrible misunderstanding!. So let me ask another question here, does this resistor (in case needed) can be placed anywhere in this LC filter ? I mean before the L or after it .and could it be placed after the C ? A simple RC filter does not at all show as similar hugh dampening performance as a good LC-pi-filter offers. I was thinking that a RC filter is a better one than LC ones.Thanks for correcting me. In the simplified schematic you used 2 different chokes to filter the analog Vcc to the MCP3201 and Op-Amps.Is it necessary to feed each of the Analog chips by different filters or maybe just a single suitable Inductor cuold be used for all ? Running analog circuitry with a non-regulated supply voltage isn't a good idea. Might be acceptable for some battery powered applications, but mains transformer powered circuits will mostly need a regulator. By routing the Vcc to the MCU board i didn't meant to use it for the Analog supply.I meant that MCU board can use this 12V Filtered unregulated input to drive some loads e.g. driving Relays.This is because i do not want to let the noise enter my PCB in any way. Best Regards : Farshid |
| Topic | Author | Date |
| Vcc Line Filtering | 01/01/70 00:00 | |
| what are the resistors across the ferrit | 01/01/70 00:00 | |
| Some suggestions | 01/01/70 00:00 | |
| RE : Some suggestions | 01/01/70 00:00 | |
| I still would like to know | 01/01/70 00:00 | |
| LC-filter versus regulator | 01/01/70 00:00 | |
| Excellent | 01/01/70 00:00 | |
| That's really good, i was thinking that | 01/01/70 00:00 | |
| I have never used any such amd never had | 01/01/70 00:00 | |
| Filter position | 01/01/70 00:00 | |
| voltage drop for a ferrite at milliamps | 01/01/70 00:00 | |
| Line regulation | 01/01/70 00:00 | |
| sorry, that was tongue in cheek, of cour | 01/01/70 00:00 | |
| my bad | 01/01/70 00:00 | |
| if anyone should be sorry, that would be | 01/01/70 00:00 | |
| SMD,RC | 01/01/70 00:00 | |
| do you remember the math in a previous p | 01/01/70 00:00 | |
| Voltage Drop | 01/01/70 00:00 | |
| Murata better than others? No... | 01/01/70 00:00 | |
| Paralleling is only a theoretical remedy | 01/01/70 00:00 | |
| my mistakes... | 01/01/70 00:00 | |
| How many filters... | 01/01/70 00:00 | |
Tada! | 01/01/70 00:00 | |
| Exactly | 01/01/70 00:00 | |
| Thanks Kai | 01/01/70 00:00 |