TVC-TRF-10-AAT
33
© SGS electronic 2006-2021
R
-
+
Figure 13: LED resistor
R
+
-
R
+
-
R
Figure 14: resistor for LED groups
one LED (diagram 13)
resistor
=
batterievoltage
−
LEDf orwardvoltage
LEDcurrent
example for red LED and 7,2V batterie:
R
=
7
,
2
V
−
1
,
2
V
0
,
02
A
= 300Ω
multiple LEDs (diagram 14)
resistor
=
Akkuspannung
−
(
LEDf orwardvoltage
×
LED count
)
LEDcurrent
example for two red LEDs and 7,2V batterie:
R
=
7
,
2
V
−
1
,
2
V
×
2
0
,
02
A
= 240Ω
The Summe of the Forward voltages should be min. 2V under the battery
voltage. If more LEDs are needed, just switch groups in parallel.
