| ??? 08/04/09 14:23 Modified: 08/04/09 14:47 Read: times |
#168146 - To Andy Responding to: ???'s previous message |
Andy Neil said:
Kiran V. Sutar said:
You mentioned 41mA per relay, so a total of about 398 mAmp at regulator input. Why would you power the relays through a regulator? The OP had mentioned that he measured the current with a multimeter in both conditions: 1.All relays OFF and 2. All Relays ON. In any case, OP mentioned, that that he measured the current before the regulator, and I assumed it must be including the relay current also. Andy Neil said:
Why would you power the relays through a regulator?
Relays should be fine on an unregulated supply - so no losses there! I have seen many products, that use relays that are powered from the output of regulator. I don't know why they did it? Did not get a chance to ask them. Andy Neil said:
Efficiency of Transformer = (Assuming) 40% Is that a realistic assumption? That is the value that I use, and it has worked pretty fine over the years. If it is something different from that, then please inform me about it. |
