Hi all,
Total noob here, so please go easy on me
I'm doing a simple UV LED strip for a project (would be blacklight for a UV patinting). I'm really a dummy when it comes to theory but so far have been able to limp along with a circuit planner. I did the same now using this circuit plan:
It's 25 UV LEDs running from a 9V battery with a 330 Ohm resistor at every LED's negative leg. LEDs are 3-3.V forward voltage, 20mA forward current.
So I wired up like this, all long legs soldered together, all short ones with respective resistors soldered together, the only difference is that I soldered the battery socket to the last LED instead of in the middle as in the image.
The result however was this.
The LED to which the battery socket is soldered to is off completely, the one after is bright, the one after is faded and it simply just fades out after 3-4 LEDs. I tried putting the battery socket somewher else in the circuit but was the same, one it's wired to is dead, the one after is bright then fades out.
I always thought the resistors should go on the long (positive) legs, but the circuit diagram showed otherwise so I went with this. Tried other batteries too, but granted they weren't the freshest but AFAIK it should be uniformly faded if the battery is low. Any tips or idea what it could be?
Much appreciated!
Total noob here, so please go easy on me
I'm doing a simple UV LED strip for a project (would be blacklight for a UV patinting). I'm really a dummy when it comes to theory but so far have been able to limp along with a circuit planner. I did the same now using this circuit plan:
It's 25 UV LEDs running from a 9V battery with a 330 Ohm resistor at every LED's negative leg. LEDs are 3-3.V forward voltage, 20mA forward current.
So I wired up like this, all long legs soldered together, all short ones with respective resistors soldered together, the only difference is that I soldered the battery socket to the last LED instead of in the middle as in the image.
The result however was this.
The LED to which the battery socket is soldered to is off completely, the one after is bright, the one after is faded and it simply just fades out after 3-4 LEDs. I tried putting the battery socket somewher else in the circuit but was the same, one it's wired to is dead, the one after is bright then fades out.
I always thought the resistors should go on the long (positive) legs, but the circuit diagram showed otherwise so I went with this. Tried other batteries too, but granted they weren't the freshest but AFAIK it should be uniformly faded if the battery is low. Any tips or idea what it could be?
Much appreciated!