I’ve been testing the DC-1248 (12Volts to 48Volts Phantom Power) the past few days now, and I was able to further improve performance by reducing ripple down to 128mV, for a 47.7Volts output, fully loaded drawing at 57mA.  Efficiency is computed to be at 76% at this loading.

I reduced the ripple by adding another 0.1uf ceramic and 47uf electrolytic capacitor to the DC-1248 output terminals.  Since there is no more space on the DC-1248 board (measuring only 1″x1″), I added these parts to our FAB1215 PSU Module.  So here’s the new Rev.B design.

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I got my prototype boards for my DC-1248 (12Volts to 48Volts DC-DC Converter).  Quickly built a prototype, and nervously turning on the power, there was no smoke, fyring bacon sound, or anything getting hot.  Yey! So far so good… Measured the output voltage and it was 48.2 Volts. Nice.

I began loading the DC-DC converter and looking at it’s ripple waveform on my scope. Happy to say that performance improved significantly just by moving it from a breadboard into a properly designed PCB!  The board is a tiny 1″x1″ square, with (4) Millmax pins so you can easily plug-it in to our FAB1215 Power Supply Board.

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Our next board up for prorotyping is our FAB1215 Module. This is a Power Supply Module, which accepts a 12V DC input, and provides a +15V, -15V, and +48V output voltages to power your project.

The +15V and -15V will be provided by a DC-DC converter, which can provide up to 190mA per voltage rail.  The 48Volts will be provided by a FiveFish Audio DC-1248 module (12V to 48V) which can provide up to 30mA (UPDATE: Received the DC-1248 prototype boards and testing shows) 60mA maximum @ 48Volts.

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