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Old 8th August 2007, 01:21 PM   #1
koli is offline koli  Norway
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Default Pearl phono with 24V battery supply

Hi

I'm a beginner when it comes to DIY audio equipment (and this forum), but would very much like to build a new phono preamp to justify all the time and money spent on finding that special Miles or Coltrane album.. I do though have some experience with designing circuits and PCBs to help me on the way.

First off, I was wondering if anyone have had some experience with battery supply for the pearl phono preamp? To me, it looks like a reasonable approach.

The easy way would be to use 2x12V/1.2 Ah sealed lead acid (SLA) batteries in series, and then charge these in parallel with a 12V cheap charger (or some other DIY charger). But from the schematics I see that the supply voltage should be around 30V (I'm going to design my own PCB with both channels, excluding the voltage regulator). So my main question is, does anyone know if the pearl preamp would work propperly with only 24V supply?

(One could put another 6V SLA in series to accomplish 30V supply, but suddenly the charging issue gets a bit more complicated. Another approach is to use 5x6V/4.5 Ah batteries in series and a 6V charger in parallel. But again it gets a bit more complicated and the size of the supply will increase drastically!)

Thanks in advance!

Koli
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Old 9th August 2007, 05:03 AM   #2
cviller is offline cviller  Denmark
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Do you plan on charging while listening? If you do, I think you'll still need some voltage regulation to suppress the supply noise.

How about simply using stock pearl diagram - perhaps lower the crc resistor and use 3x12V batteries?
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