New Railway Modellers Forums

1K might be a bit low if the DCC p-p voltage is very high. Actually belay that. Even if DCC peak voltage was 18V and the forward voltage drop on the opto-coupler input was 1.7 (which is the max for a 6N137 apparently) you'd only get 16.3mA coming through the resistors ((18V-1.7)/1000). Maybe the in...

I wonder if the LED is being driven directly from the DCC input and what the circuit is. Hm, yes it is. According to their circuit (see page 4) the indicator LED is reverse parallel across the LED input of an opto-coupler and has in series 2x2K resistors in parallel (so 1K basically). 1K might be a...

I don't understand: He demonstrated that the faulty LED was getting 6.5v and, I think, mentioned that the voltage-regulator had failed open-circuit, which would have eventually caused the LED to fail. So why didn't he change the voltage regulator as well -- or did I miss it? What I got was that the...

The stained glass particularly well done. Thanks :) but I can't really take credit for that, it came with the kit. Some parking https://lh3.googleusercontent.com/3qjb4_sMw-aVNbmLhHvt7ojSHTyriFuWzbk4_2ejXc1FFdMtFT0G9lTZdCsSz3PTFRAbEXaTlBMREll2ESrpH0jbEyS9WHSfO4Vj0XzXm6_YMZ5FtJ_m9qmG7ct8GZxbs4MuSZ2Du...

Most layouts can always use more figures. Make sure you check the scale.

D0260 wrote:'Ringing can be just using a x1 probe across the track ( or the power supply panel)

Make sure its a x10

Good point but I assumed both traces were taken with the same probe.

That "ringing" you see on the second trace looks like a square wave with a low pass filter. Maybe some capacitance across the rails?

You can't use the [img] tags for videos. Just paste the address or use [url] tags.

first video

second video

third video

That's very bad luck.
As far as I'm aware Digitrax are very much still in business. http://www.digitrax.com/
Here is their list of UK dealers.
http://www.digitrax.com/dealers/by-area ... 20Kingdom/

that works. Very nice.

hi triuph,
I can't see the video. It says it's private.

Kansas enjoyed the glow of being a very pacific corn and wheat region, with little crime...until the Holcomb massacre. That rather withered everyone's sentiments. Hm.. just read up on it. Sad. There must be few places that don't have similarly withered sentiments by now. But on with the show.. Here...

Previously I've used the self-adhesive weights they use for automotive wheel balancing.

Nice work with the hedges.

Great! I liked the street view and the tower in the picture with the silver diesel - is it scratchbuilt or a kit? Thanks! You mean this? https://lh3.googleusercontent.com/LLTQNRmPWVMxlXqxy5JxRrBD_Gl5LmBYpLp6qLzUyEKf7jUGF8pZmFU7xkWCGey-qAThqn7BlZsrjv37nymi5pJve5kjL-QLJK_LVSXJS6LSjHBBMDs9PpJ5T_9STfb4...