The PRIZM Sound Board User's Manual
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datasheet. The led current has to be decided by the user, depending on the
brightness and the maximum rating of the used LED. 5 to15 mA are fairly common for
most accent LEDs.
As an example, let’s consider a 1.6 volt LED (red) at 10 mA
R = (3.3 – 1.6) / 0.01 = 170 ohm (
150 ohm in the classic E12 resistor serie)
Be sure not to drive too much current in the LED (18 mA max). If you wish a good
brightness with a low current, use high efficiency LED (generally coming in a
transparent “crystal” casing).
Please see further in this document for the sequencing of the accent LEDs.
High-power LED wiring
PRIZM is dedicated to color mixing, so we will cover only the wiring of a multi-die LED
in this paragraph. 3-die LEDs are obviously proposed for PRIZM, but a 4-die LED is
also possible, having 2 dices wired in parallel on a particular channel.
The example above shows a power LED with individual dice. Common anode LEDs can
be wired just the same.