25-02-2019, 04:44 PM
I reckon Polyfuse in series with the output.
The regs have inherent overcurrent protection. The 2 diodes will protect against reverse and overvoltage applied to the output. The bridges really ought to be rated sufficiently not to blow up if abused slightly. Perhaps 200V 4A or so. Very cheap, readily available and way beyond anything they're going to encounter in real life.
I have this dim memory that model trains were happier with a rather rough DC than with the nice smooth output from a regulator. For example this H&M controller had a switch to give you halfwave rectification. https://www.yesterdaystoys.co.uk/Hammant...ATJVW.aspx
Or is this an obsolete idea. Or an urban myth.
The regs have inherent overcurrent protection. The 2 diodes will protect against reverse and overvoltage applied to the output. The bridges really ought to be rated sufficiently not to blow up if abused slightly. Perhaps 200V 4A or so. Very cheap, readily available and way beyond anything they're going to encounter in real life.
I have this dim memory that model trains were happier with a rather rough DC than with the nice smooth output from a regulator. For example this H&M controller had a switch to give you halfwave rectification. https://www.yesterdaystoys.co.uk/Hammant...ATJVW.aspx
Or is this an obsolete idea. Or an urban myth.
www.borinsky.co.uk Jeffrey Borinsky www.becg.tv
