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Author Topic: Heil Fin Microphone LEDs  (Read 1332 times)
ND9B
Member

Posts: 52




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« on: November 21, 2011, 06:26:15 PM »

Has anyone done a mod on this microphone to run the LEDs on 12V ? This microphone is so good looking with the LEDs lit up. But the 48 volt phantom power is so inconvenient for us Hams.

ND9B
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AD6KA
Member

Posts: 2238




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« Reply #1 on: November 21, 2011, 09:48:54 PM »

Determine the type of LED's you want to use.
Now you can go to this spiffy online series/parallel LED
array calculator to get the resistor value(s) you'll need for 12 volts.

http://led.linear1.org/led.wiz

Now plug in your values:
You know the source voltage is 12v....or 48v?
From the LED packaging or catalog get your LED's
Forward Voltage and Forward Current (in mA).
You know the number of LED's: 4
Click on "Wiring Diagram"
Then Click on "Design My Array"

VOILA!
You now know your current limiting resistor/resistors value.
Have a diagram of the circuit (or schematic if you chose that option)
Power dissipation of each resistor.
Recommended wattage rating for your resistor(s).
Combined power dissipation of each resistor if more than one.
Total current drawn by the array.
Total power dissipated by the array.

Have fun! Let us know how your project works out.
GL ES 73, Ken  AD6KA

PS: What is 48 volt "Phantom Power",
where does it come from in the MIC circuit and
what is it's purpose? Just curious.....
« Last Edit: November 22, 2011, 07:18:45 PM by AD6KA » Logged
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