| ??? 09/22/09 03:50 Modified: 09/22/09 04:05 Read: times |
#169028 - Current Limiter Responding to: ???'s previous message |
Steve, I believe the circuit board is already the current limiting circuit, it have a trimpot and runs from 3v... this is another thing makes me certainly it is from a laser pointer.
Also, I need to supply it 3v... can I make 3v from 5v using 3 diodes 1N4007 in series?... if the drop is 0,7v per diode, then would be 2,9v to laser, which is ok. I'm trying to drive the laser using an UNL2803 and 3 diodes in series like I said, but the laser dont ligths up, the voltage measured in the output (with the laser connected) is 1,84v EDIT: I will need to modulate the laser around 100hz~200hz Thanks. |
| Topic | Author | Date |
| Laser adjustment / power calculation / current measuring | 01/01/70 00:00 | |
| Is that 50 mW output power? | 01/01/70 00:00 | |
| OP power | 01/01/70 00:00 | |
| Current Limiter | 01/01/70 00:00 | |
| Try a voltage regulator first ... | 01/01/70 00:00 | |
| Bench Supply Even Easier | 01/01/70 00:00 | |
| If he's got one ... | 01/01/70 00:00 | |
| I've got several... | 01/01/70 00:00 | |
| Have you shipped anything lately? | 01/01/70 00:00 | |
| Far too serious | 01/01/70 00:00 | |
| Well, I was thinking along those lines ... | 01/01/70 00:00 | |
| No bench supply =( | 01/01/70 00:00 | |
| It's hard to work without one | 01/01/70 00:00 | |
| Cant do without a bench supply? | 01/01/70 00:00 | |
| Yes you can! | 01/01/70 00:00 | |
| Make one.. | 01/01/70 00:00 | |
| That's an important feature | 01/01/70 00:00 | |
Power supply should be the FIRST project! | 01/01/70 00:00 |