Reply to "AC to DC conversion"

KarlDLOGR Forum Member DIGITAL SUBSCRIBER

@Ted S posted:
Karl I'm curious, why don't you like to use the linear regulators?

Same response as Pete. The switchmode DC>DC converter/regulators dissipate much less power and therefore are much better suited to O gauge locomotives, if sufficient space is available inside the carbody/hood. Assuming 18V input to the Blunami card and 18 VAC track voltage, a switchmode regulator in a dual can motor engine will dissipate around 2W, half of what a linear regulator would burn up in heat. At lower regulator output voltages, (such as 13-14V for a single-motor locomotive) the efficiency advantage is even greater. Not to mention avoiding dissipated heat melting nearby plastic surfaces! But at the lower current levels and available space of S gauge, they may be a good means of protecting the Blunami card from overvoltage, as long as the Blunami input voltage is only a few volts less than the rectifier DC (or RMS) output voltage.

9/29/2310:02 PM

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