Fischertechnik used usually normal lamps. Normal light bulbs are expensive and break down quickly.
In fischertechnik be led little be used.
Somehow fischertechnik is not as timely. That's a shame. LEDs can be very easily integrated into fischertechnik.
Step 1: Parts
I used two Kingbright BIG LAMP with 20mm diameter.
It is a very large LED. Ideal to display something.
The LED is available in different colors.
The kids like them very much.
The LED consis of 6 single LED. 3 in a row. 2 in parallel.
The supply voltage is 6 volts, the current 20 mA.
We need a series resistor of about 150 ohms.
Red LED: Part Number: DLC2/6ID
Green LED: Part Number: DLC2/6GD
- one or two 150 Ohm Resistor (for 9 Volt)
- 2,6mm Märklin sockets (Can be replaced by cable)
- prototyp pcb
- epoxy or hot glue
Step 2: Circuit
If we use a fischertechnik controller, we can operate the two LED anti-parallel. Depending on the polarity of the drive output red or green LED lights. We need then to control only one pin.
We just need a series resistor.
For general applications, it is better to control both LEDs separately.
The series resistor is calculated for 9 Volt fischertechnik.
Step 3: Contruction
First, we drill the holes for the LED 2. A proto-type board is helpful. But it is also without. We solder the LED and the resistor. If necessary, we also have a separate copper track. The separated wires led us to use for the attachment of the sockets.
For mechanical stabilization, we shed the back with epoxy or hot glue.