Reply to "Narrow Version of DIY 317 Voltage Regulator Board, with Build Files"

stan2004OGR Forum Member

TedW posted:
Guys, addressing my ignorance, what are some uses/applications for the “common ground” option of these pcbs? Why would I need to do this? Thx Ted

photo hi-jacked and modified from previous OGR thread

In addition to rolling-stock, it could be used track-side if you use/need insulated-rail relays for signals, crossing gates, etc. It's just that off-the-shelf relays run about $10 each (plus shipping). But using Rod's board configured for half-wave common-ground with 12V DC output, you could use transformer AC Accessory voltage (e.g., 16V AC) with a 1, 2 or 4 channel 12V DC relay module from eBay free shipping from Asia. The relay modules are less than $1 per relay so you could rack up some serious $avings!

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