| ??? 11/18/13 23:08 Read: times Msg Score: +2 +1 Good Answer/Helpful +1 Informative |
#190151 - Bourns says: "yes." Responding to: ???'s previous message |
Raghunathan said:
Considering a potentiometer with the same rating - does the maximum current apply to both the winding as well as the wiper contact ? Dear Raghunathan, decades ago Bourns has pubished a trimmer handbook in which they give an answer to your question: If the wiper maximum current rating isn't specified in the datasheet, the maximum current through the wiper is the same as what the trimmer element can handle at maximum power dissipation, provided it doesn't exceed 100mA. So your wiper can safely handle about 30mA. By the way, even a minimum current across the wiper is necessary to guarantee a proper wiper performance: More than 25uA, better more than 100uA. This is often overlooked, when connecting the wiper of a trimmer directly to the input of an FET-OPamp... Kai Klaas |
| Topic | Author | Date |
| Power rating of potentiometers | 01/01/70 00:00 | |
| Not the point | 01/01/70 00:00 | |
| show me such | 01/01/70 00:00 | |
| (was) incorrect | 01/01/70 00:00 | |
| not your average "pot" | 01/01/70 00:00 | |
| Specs that are not normally told.. | 01/01/70 00:00 | |
| power | 01/01/70 00:00 | |
| test bench vs field design | 01/01/70 00:00 | |
| That was kind of my point | 01/01/70 00:00 | |
| pot limits | 01/01/70 00:00 | |
| While I don't disagree ... there are different failure modes | 01/01/70 00:00 | |
| Bourns says: "yes." | 01/01/70 00:00 | |
| Tesla says: no | 01/01/70 00:00 | |
| cermet or wirewound | 01/01/70 00:00 | |
No big difference, if it all | 01/01/70 00:00 |