I need to build an ammeter circuit for a model train layout. I want to use an analog ammeter (I just like the look of them) but I have to do some special stuff because DCC (the control system for the trains) is electrically weird. It's basically AC, except it sends data by flipping the polarity.
I found a how-to on making an ammeter for DCC, and it uses a DC ammeter gauge with a bridge rectifier. I have an old monitor power supply board (the backlight died, long story) that happens to have a bridge rectifier on it, so I'm thinking I'll use that instead of buying one.
My question is will having a bridge rectifier that is rated for more voltage than you need cause problems? I wouldn't think so, but I don't wish to smoke anything so I figured I'd ask.
Also, is there a way to measure the amperage consumed without a voltage drop on the track? A small one isn't really a big deal, but if I can remove any drop that'd be awesome.
Edit: My DCC controller is a Digitrax Zephyr Xtra, if anyone is wondering.