Under reference Bois Modelisme 113002, here is a metallic LED knocker, in various materials wood base, to scale HO 1/87th.
A metal knocker comprises two steel legs and a wooden buffer, with the legs made from welded pieces cut from a metal beam, positioned outside the rails.
The HO-scale illuminated knocker is an easy-to-assemble kit, offering a remarkable level of detail with parts in clusters: legs and bumper in three-millimetre MDF, lamp and stand in one-millimetre birch plywood.
Fitting the lamp is optional, and the purple diode wires are varnished to prevent short circuits. It finds applications in depots, sidings, industrial sidings, etc.
Additional features on the diode:
- Type: 0603 pre-wired with enamelled wires.
- Colour: purple.
- Wire length: 140 mm.
- Wire cross-section: 0.5 mm.
- LED dimensions: 1.6 mm x 0.9 mm x 0.4 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 has a value of 450 Ohms.
