(I know, I know... you can buy these things....)
A quick little thing that shows the presence and polarity of power on the track; the active parts are a red/green bi-colour LED and a 560 ohm resistor. When the red crocodile clip is positive, the LED glows red and when the green crocodile clip is positive, the LED glows green...
(https://forum.009society.com/proxy.php?request=http%3A%2F%2Fhnorwood.co.uk%2Ffiles%2Fimages%2Fcontroller%2Fttrktsta.jpg&hash=22af20293e25ff18643e43bf6aa297e3f66eb5d7)
(https://forum.009society.com/proxy.php?request=http%3A%2F%2Fhnorwood.co.uk%2Ffiles%2Fimages%2Fcontroller%2Fttrktstb.jpg&hash=fbb5562bd92ce1060463635f4d17c8bc8ec1d77a)
If you can buy it or not doesn't make a difference - you made it, you had probably fun making it and it is useful for you. So all boxes are ticked. I like this approach.
Have you got a wiring diagram for this ? See my post dated 27/11/17 - Keith
Does this work with common return? Circuit diagram please.
Mal.
Quote from: hughn on February 06, 2016, 14:42
(I know, I know... you can buy these things....)
A quick little thing that shows the presence and polarity of power on the track; the active parts are a red/green bi-colour LED and a 560 ohm resistor. When the red crocodile clip is positive, the LED glows red and when the green crocodile clip is positive, the LED glows green...
(https://forum.009society.com/proxy.php?request=http%3A%2F%2Fhnorwood.co.uk%2Ffiles%2Fimages%2Fcontroller%2Fttrktsta.jpg&hash=22af20293e25ff18643e43bf6aa297e3f66eb5d7)
(https://forum.009society.com/proxy.php?request=http%3A%2F%2Fhnorwood.co.uk%2Ffiles%2Fimages%2Fcontroller%2Fttrktstb.jpg&hash=fbb5562bd92ce1060463635f4d17c8bc8ec1d77a)
Hi Hugh,
A nice bit of lateral thinking and application.
Yes - something similar can be bought.
For me though - all it takes is a quick rumage in the electronic bits box to fine the components and ten minutes to make it!
Thanks
Just picked up on this
Two components - a bi-colour LED and a 560 Ohm resistor in series with it - and two Croc clips.
I'll draw a cct diagram.
(https://farm5.staticflickr.com/4559/37810989875_15be00868c.jpg) (https://flic.kr/p/ZBecYx)track_power_ind (https://flic.kr/p/ZBecYx) by H Norwood (https://www.flickr.com/photos/hnorwood/), on Flickr
Thanks for thi. I'll try it. - Keith
This does not affect the working of this tester in any way however it is perhaps worth mentioning that the early egger-bahn locos made in the 1960's with the Marx nanoperm/microperm motors and the tram locos with the Lima motor run in the opposite direction on the track to all other H0e, 009 and N gauge locos. It is also very difficult to change them without causing damage.
Brian Meldon