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While building my N scale railroad I realized there are very few choices for N scale signal and they are very expensive for me. also I didn't found them detailed enough and prototypical. so I decided to build my own.
Here is the N scale signal with detailed tutorial of how to do it from start to finish.
While it is designed for N scale it can also work for HO scale but you will have to find things that fits HO scale for ex. you will need at least 3mm of pole diameter for HO scale. I have shared HO scale files as well for anyone to try.
For the electronics you will need 0603 SMD LED here is the link of ebay-
For Injection Nib use 1.2mm OD and 30mm length NIB here is the link -
I will post the next video on automatic Signal with track attachment so keep an eye on my YouTube channel.