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Connecting the LED Strips/LEDs
When connecting LEDs and LED light strips, observe correct polarity of the connection
lines.
The light offers the possibility of directly soldering on up to eight LED strips with an operating voltage of
12 V and a maximum power intake of 1 A/per strip. Four coloured LED stripes are already included in the
night-flight kit.
Even if the MOSFET switching outputs (FDS6890A) can resist up to 7.5 A, it is recommended not to load
the separate outputs with more than 1 A due to the board layout and cooling.
If you want to solder in individual LEDs with a lower operational voltage of only 2 - 3 V, a suitable dropping
resistor (Rv) must be calculated. For calculation of the dropping resistor, you should use an operational
voltage of 12 V, since a freshly charged LiPo battery may have far more than 12 V instead of 11.1 V.
Example calculation:
Assuming that the light diode used has a supply voltage of 2.6 V and a power intake of 20 mA, first the
dropping resistor voltage must be calculated:
12 V – 2. 6 V = 9.4 V
If you want to switch two same diodes in sequence, 2 x 2.6 V = 5.2 V must be subtracted from the operat-
ing voltage of 12 V.
For three same diodes, this is 3 x 2.6 V = 7.8 V to be subtracted from the operating voltage of 12 V (12
V - 7.8 V = 4.2 V).
Now use Ohm's law R = U : I to calculate the dropping resistance Rv:
Rv = 9.4 V: 0.02 A = 470 Ohm
Use the formula P = U x I to also calculate the output the dropping resistor must be able to withstand:
9.4 V x 0.02 A = 0.188 W
A resistor with an output of ¼ W (0.25 W) would therefore be sufficient.
The respective upper connection contacts of the plugs X3 (L1 to L4) and X4 (L5 to L8) are intended for
the LEDs or LED strip connection.
The lower connection contacts are connected to the plus connection (+) of the drive battery (11.1 V of the
LiPo battery).
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