[sdiy] Prebuilt bipolar 15v supply?

[Scott Gravenhorst]

"Samppa Tolvanen" <samppa.tolvanen at gmail.com> wrote:
>Hi all,
>
>On 10/12/07, Dave Magnuson <resonant at hoohahrecords.com> wrote:
>> Hi Sam,
>>
>> If I were in your shoes, I would probably build a small linear power supply
>> and feed it with a 12 or 15VAC wall wart.  You'd just need a small board
>> with a few regulators, diodes, caps.... pretty simple.
>>
>
>> Doesn't Paia...?
>
>> Dave
>
>PAiA Fatman is supposed to run from 12VAC 500mA supply. (Scott - Are
>you there - have you regulated supplies build to your Fatmen?).

The schematic calls out a 12 volt AC 500 mA xfmr (wallwart).  The regulators consist of
three - a 7805 with inline input power resistor, a 7808 and a 7912.  It is indeed a half
wave circuit.  The 7808 and 7805 share one diode, the other diode supplies the 7912.  It
powers the FatMan plus a few light weight mods.  When I needed more power, I just cloned
the supply to provide more +8/-12, but this could be done to make equal voltage supplies too.

>I think I'm with Dave here (?!)..
>
>What You "REALLY" want is AC/AC wallwart with halfwave regulation
>inside the sequencer. From the memory, it's about 2 power diodes,
>smoothing caps before and ofter 7*12 regulators. That should give You
>smooth +/-12VDC power for a standalone sequencer.
>
>It will be a small addon board to the sequencer, but should be easy to
>build and looking at Jameco's offerings: http://tinyurl.com/29qfgd
>won't really be that expensive even if you have to do the supply PCB
>ect.
>
>Samppa
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-- ScottG

-------------------------------------------------------------

-- Scott Gravenhorst
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