tams
elektronik
FI-1
English
6. Connecting the FI-1
Connecting the LEDs
LEDs should always be connected to the function outputs of the vehicle
decoder via a series resistor. If not operated via a series resistor they
will be destroyed when put into operation. The value of the series
resistor depends on the supply voltage.
Necessary value of the series resistor for a dual-LED with 15 mA current
input:
Digital voltage on the rails [V]
Value of the series resistor
12
820
W
14 – 16 V
1,0 k
W
18
1,2 k
W
20 – 22 V
1,5 k
W
> 24 V
1,8 k
W
Advice:
When using a not regulated booster, the digital voltage on the
rails is 1,4-fold as high as the nominal voltage of the transformer.
Example:
Nominal voltage of the transformer: 18 V
à
Digital voltage on the rails:
1,4 x 18 V = 25,2 V
Connecting a LED for the top light
You can connect an additional yellow LED for the top light in series with
one of the two dual-LEDs (yellow LED) to the function inverter.
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