| ??? 12/03/09 21:13 Read: times |
#171449 - What are you trying to prove? Responding to: ???'s previous message |
Per Westermark said:
The component I linked to would manage reasonably well with a 11V p-p sine wave with a 24V DC offset.
A suggestion of 11V DC with 24V p-p AC would mean -1V to +23V. I challenge you to get a 7805 to manage with such input and no cap, coil or other hardware to filter the input. I didn't say it would. All I did was to mention that an LM317 might provide Chico, the O/P, with a useable 3v3, or whatever, voltage supply. Now, please stop writing ridiculous posts and return to earth. You are fighting an argument that is silly, and you are trying to smash in open doors - no one has every claimed that a CC regulator can invent current. And no one is really interested in the actual circuitry inside a CC regulator just as people do not care too much about the innards of a 7805 regulator. You aren't scoring any points with your posts. Just making people look for the "ignore poster" button. I'm not into scoring points, though I submit that apparently, rather than exposing useful information, you and Erik have both taken to shouting "I'm right and you're wrong!" even if the argument is entirely irrelevant to the discussion. Nobody brought up current sources until Erik jumped in with his foolish remark about laser diodes being current devices. While that might be true, it certainly wasn't relevant to what was under discussion. Then, he went on to suggest that his LED driver would "do the job" without a regulated supply, which it would certainly not. Rather than wasting more time and bandwidth on this unproductive line of rhetoric, why don't you tell us what it is you want to prove. It's certainly not been stated so far, and it certainly isn't relevant to this thread. Erik made an unsupported claim, probably just because of poor wording, but one that's irrelevant to the thread. He did make an important point, that being that one shouldn't buy a device for which he needs precise specifications, when it's not possible to get them. That's something he's mentioned before, and people should pay attention! The device in question is apparently a laser pointer ... one that's no longer offered on eBay, and whose seller is no longer offering anything on eBay. I found that none of those similar devices still offered on eBay have specifications available. Those are, after all, commercial off-the-shelf devices that come with instructions but not technical data. It's important to know what you're buying. Erik pointed that out. I've often had to prod Erik considerably when he's been loath to provide examples of things he believed existed. I recall one instance regarding LCD modules, where, after much prodding, he actually provided a link to an LCD supplier whose bias voltage was positive. While I didn't deny that such things existed, having, in fact, had one on my desk at the time, I challenged him to produce an example. After all, it was his baby! He had made the assertion a that such things were "out there." Ultimately, he produced it. Now, what have YOU contributed to this thread? Is it possible to generate a constant current source, irrelevant though it may be, that in no way utilizes, at any stage in its operation, a controlled, precise, regulated, or whatever you choose to call it, voltage supply/bandgap/reference/zener? If so, why not simply show it to us? Why go on and on saying "there are such things" when you have no example? Someone, somewhere, might benefit from seeing such a thing! RE |
