You don't need a resistor, you can drive it directly from the board.
You don't need a resistor, you can drive it directly from the board.
I don't think so. Running it off the board at 4.8V (Is that right?) should work fine, but maybe someone with more experience working with P4s can chime in.Originally Posted by sfer1
EDIT: Oops. The man with probably the most experience chimed in while I was typing.
There's always a bigger fish.
The last time I measured the output voltage and current from a MR board with 6V input it was 3.2V and 1200mA. That was with an Anakin board. I have a Vader and Yoda that I can test too.
Thanks!
"I'd rather be hated for who I am, than loved for who i am not."
Have anyone measured the output voltage from a Mace FX board? I believe I used the correct resistor, but my led got hot really fast.
Mace FX board
4.8V battery pack
Red Seoul P4 (Forward Voltage: 2.5V, mA: 800)
1 Ohm 2 Watt resistor
"I'd rather be hated for who I am, than loved for who i am not."
Dumb question, but I assume your LED is fixed to a heatsink, right? You might want to try a 2.2 Ohm resistor.
There's always a bigger fish.
Yep, it's fixed to a copper heatsink.
"I'd rather be hated for who I am, than loved for who i am not."
Then it sounds like you need more resistance.
There's always a bigger fish.
The problem you are having is that the red and amber LEDs run at a lower voltage (2.85V), so it is getting very hot with 3.2V going to it. Adding a little more resistance should do the trick. Try adding a 1 to 1.5 ohm resistor.
I had added a 1 Ohm 2 Watt resistor, but the voltage output from the Mace board might be higher than 3.2V. I'll try adding a 2.2 Ohm resistor as Matt suggested.
"I'd rather be hated for who I am, than loved for who i am not."
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