Under reference Bois Modélisme 113003, here is a LED Bi-Bloc knocker, in various materials wood base, to scale HO 1/87th.
The bi-block knocker, made up of two reinforced concrete legs and a wooden bumper, differs from conventional knockers by being placed at the end of the track. This HO-scale kit, measuring 33x25x18 mm, can be used to quickly build a detailed illuminated knocker. Comprising two clusters of MDF parts for the feet and the bumper, and a lamp with its cardboard support, assembly of the lamp is optional. The purple diode wires are varnished to prevent short circuits. Perfect for depots, sidings, industrial sidings, etc.
Assembly:
- Double the legs by gluing the pieces together two by two.
- Gluing the stopper onto the legs.
- Gluing the lamp onto the lamp holder.
- Glu the lamp and lamp holder to the bumper.
LED specifications:
- Type 0603 pre-wired enamelled wires.
- Colour: purple.
- Wire length: 140 mm.
- Section: 0.5 mm.
- LED dimensions: 1.6x0.9x0.4 mm.
- Luminous intensity: 600 mcd.
- Consumption: 20 mA.
- Threshold voltage: 1.9 Volts.
- Advised supply voltage: 3 Volts.
Help with calculating the resistance depending on your supply voltage:
The value of the resistor R (in Ohms) to be placed in series is equal to:
R = (Valim - 3) / 0. 02
with Valim: your supply voltage.
Example: supply voltage of 12 V (Valim = 12V) the resistor to be placed in series at a value of 450 Ohms.
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