The Fleischmann V100 is a classic. In fact, my model is about 12-15 years old. It was time to improve it.
Fleischmann N – DB V100
Despite its age, this model has a solid construction. I had it converted to DCC, about 10 years ago. It was time to change everything. New lights, new decoder, here is what I added:
The DH05C decoder is small and limited in total power output. It is however powerful enough for small engines, and has many outputs.
I connected 4x 100uF capacitors from 1001-digital.de in Germany. These are super small. They are limited to 16V, so you need to connected a 16V Zener diode in parallel to protect them (my track power is set to 14V anyway).
Capacitors and Zener diode 16V for surge protection
4x 100uF SMD capacitors
The capacitors, isolated, at the bottom of the engine
Also, as recommended when buffering decoders with capacitors, I added a 100ohm resistor with a Schottky diode before the capacitors. This prevents the capacitors from “charging” too fast (drawing too much power from track instantly), but allows the power to flow back unimpaired to the decoder when needed.
Schottky diode + 100ohms resistor before the capacitors
The lights are all connected on individual outputs (4 in total). Such a setup is rare with store-bought N scale models. Usually, the front white lights are connected to the rear red lights, and vice versa. Why is that a problem? Because when the locomotive is attached to cars or coaches, the lights on the convoy side are supposed to be off ! With each lighting block on an independent output, one can achieve 100% realistic lighting. Details in the video:
Last but not least, I added a single led to be able to switch the driver cabin on. The DH05C with the latest firmware model was perfect for this. The SUSI output, usually designed to connect sound modules, can be repurposed as 2 additional outputs (Aux 3 and Aux 4). Be careful though: those 2 outputs are NOT amplified (they are “logic” outputs). Usually, you would need a transistor to amplify the outputs, otherwise, the decoder would burn. In my case however, my LED with a resistor will draw about 5-8 mA. This is very low, and I assumed (apparently correctly), that the output could handle it.
Custom light board
Driver cab lighting
Final tests, view on decoder and driver cab lighting
Driver cab lighting test
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