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I just received a small helmet camera called Contour HD 108OP . On sale for 50 bucks. Tested it last night for the first time.

The camera train is getting a lot of red signals as it is chasing a slower one, which you may spot in the distance. Note, my block system uses 40 watt 5 ohm resisters across each electrical gap. No more completely dead track, brick wall stops or traction tire ripping starts. Also E units stay latched so no more programming for one direction running.

Even though I thought the train was not fast the camera picture looks otherwise. Click on picture for video. A bit long. Use full screen with sound up.

quote:
Originally posted by jjm:
"The easiest way is to tap off track power and use a full wave bridge, an electrolytic cap, and a three terminal regulator."

And there you have it.

Now, for those of us less well-versed in such things, how does one assemble this?
You take the rectifier bridge, wire the track pickups to the AC terminals, they're the ones with the sine wave symbol on them. The DC comes out on the + and - terminals. Connect the electrolytic across those terminals with the proper polarity. Connect the input of the three terminal 9V regulator to the + side, the ground to the - side, and the output and ground supplies 9 volts. Here's a circuit drawing, you can use diodes or the bridge component. The capacitors are 47uf 50V electrolytics, and the regulator is an LM7809 or similar in the TO-92 package.

Ignore the 5V in my picture, it was for a 5V design, the 9V is identical except the part is different. The transformer illustrated is your track voltage.


I did some checking and the camera I'm using cost me about a hundred bucks, not fifty. They are discontinued; however I see they are currently available for $137.00.

Battery operated with Micro SD card storage. I just put it on a flat car with a rubber band. The lens can be rotated for laying on either side or standing up.



Here is a video, click on picture, of a fast freight following a slower one.

quote:
Originally posted by gunrunnerjohn:
quote:
Originally posted by jjm:
"The easiest way is to tap off track power and use a full wave bridge, an electrolytic cap, and a three terminal regulator."

And there you have it.

Now, for those of us less well-versed in such things, how does one assemble this?
You take the rectifier bridge, wire the track pickups to the AC terminals, they're the ones with the sine wave symbol on them. The DC comes out on the + and - terminals. Connect the electrolytic across those terminals with the proper polarity. Connect the input of the three terminal 9V regulator to the + side, the ground to the - side, and the output and ground supplies 9 volts. Here's a circuit drawing, you can use diodes or the bridge component. The capacitors are 47uf 50V electrolytics, and the regulator is an LM7809 or similar in the TO-92 package.

Ignore the 5V in my picture, it was for a 5V design, the 9V is identical except the part is different. The transformer illustrated is your track voltage.




Just make sure that the track ground common is not crossed with the ground symbol wires. In other words two wires from the power roller and truck frame common, and two wires out 9V and ground. But then you already knew this right? Wink

If the camera outputs component (red/green/blue RCA cables), and your TV only has a coaxial connector, you're generally out of luck. The  camera is probably outputting video at a higher resolution that the TV you're planning to use (an old unused set, right?) is capable of displaying anyway.

 

It's technically possible to string together a bunch of converter boxes to possibly get a standard-def composite output, then use an old VCR or an RF converter to get a coaxial connector. Chances are by then you may be better off getting a smalll LCD digital tV which is pretty much guaranteed to have a component input.

 

---PCJ

Originally Posted by gunrunnerjohn:
BTW, I like the camera I posted because it broadcasts to a composite signal, and you can record it or display it on a TV and watch the train progress live. Big Grin

Can you get a clean signal on your TV? The problem with the older cameras at least was the noise spikes generated by the sparking rollers would interfere with the broadcast signal. Not a problem for a camera with on board memory used for later play back.

 

Pete

Thanks Subway Vic. I bought a modulator at Radio Shack and it now works quite well. I do lose the signal in parts of a tunnel but, as someone mentioned, it would be dark in there anyway. It works very well around the rest of the track. The only problem is that the lighting on my layout is not very bright and the picture is rather dark. I will have to think about whether I want to change the lighting.

Post

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