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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


Other Parts:

- 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.

Step 4: Action

<p>i like this and i will make it work with 220V AC for my dark room...red is busy and datk inside due to film development, green is ok....nice thanks for the idea</p>

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Bio: I live in Braunschweig, Germany with 3 children. We love to build and experiment.
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