Many__Of__Horror
Active member
I am looking to build an LED desk lamp for my daughter with an on/off switch and dimmer just like the one the make at Coppersound Pedals
I am wondering what the best practice is to run 9 x LEDs from a 9V battery. I am also a little unsure where to put the dimmer pot in the circuit.
So far I have come up with:
My concerns with this circuit are mainly the fact that a 9V battery will only last about 5 hours on it (i think) Are there more power efficient ways to deal with this?
I would also likely change the resistors to include a 25% ceiling at the cost of max brightness to increase LED life and battery life, and also measure the actual Vr of each LED to calculate the exact resistor needed to account for manufacturer variance.
Anything tips or info is always appreciated
I am wondering what the best practice is to run 9 x LEDs from a 9V battery. I am also a little unsure where to put the dimmer pot in the circuit.
So far I have come up with:
My concerns with this circuit are mainly the fact that a 9V battery will only last about 5 hours on it (i think) Are there more power efficient ways to deal with this?
I would also likely change the resistors to include a 25% ceiling at the cost of max brightness to increase LED life and battery life, and also measure the actual Vr of each LED to calculate the exact resistor needed to account for manufacturer variance.
Anything tips or info is always appreciated