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

Rod, after linking back to earlier LM317 threads there is the dangling participle of isolated AC vs. DC ground.  Does the 3-D rendering function allow you to "install" a 2-cent 1N400x diode into 2 of the 4 bridge pads (AC to +) and, say, a jumper wire between the other 2 bridge pads (other AC to -)?  This would allow the same board to be used for 1/2 wave rectification where the AC and DC grounds would be the same which can be handy in some rolling stock applications.  This can also be handy in track-side applications making it directly compatible with insulated-rail triggering.

Separately, I may have missed it but I didn't see discussion of using the LM317P insulated package which would allow you to bolt the LM317 directly to the chassis/frame from heat management. 

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That is, finding those insulating washers and related hardware pieces can be a nuisance.  The insulated package is harder to find but can be expedient albeit at a price.  You can't get a whopping deal on eBay as you can with the LM317T (metal tab) for less than a dime.  While there are several eBay sellers of the insulated package, this may be the rare case where buying from DigiKey is cheaper! 

 

 

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Last edited by stan2004

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