[sdiy] buchla 200e power supply

[Seb Francis]

Hi Derek,

Have a look here:
http://www.linear.com/pc/viewCategory.jsp?navId=H0,C1,C1003,C1042
Look at Inverting and possibly Step-Up (Boost) regulators.

But to implement well enough so you will have clean analog power takes 
more than a few components.  You will see basic typical circuits in the 
datasheets that show only a few external components, but to get rid of 
the high frequency switching noise from the DC you need further 
filtering and/or linear regulation.  Also, the choice of certain 
components such as the inductor can be quite critical to good performance.

All in all I would say that for SDIY you would be better using a single 
AC wall wart and half-wave rectifying to get dual DC.  I've used this on 
quite a few projects where I wanted an external transformer.  Look at 
the power supply sub-circuit for this:
http://burnit.co.uk/sdiy/index.php?page=boxotrix&subpage=schematic
This is using adjustable regulators so is slightly more complicated than 
if you were to use fixed like 7812/7912.  Also, ignore all the caps on 
the right, they are just decoupling used throughout the whole device.

Seb



Derek Holzer wrote:
> Hi Magnus,
>
> thanks! Do you have any references for using this in a SDIY context? 
> Or at least some component names so I can look up datasheets?
>
> D.
>
> Magnus Danielson wrote:
>> Derek Holzer wrote:
>>> I just read that the Buchla 200e system gets powered by a 12V DC 
>>> wall wart, or by a single 12V battery. How would one get a usable 
>>> dual power supply using a single DC source? Or does the Buchla PS 
>>> give +12V and -12V from the wall wart?
>>
>> They could be using modern DC-DC converters. It's off the shelf 
>> components or designs and when executed correctly reliable and not 
>> producing much excessive heat.
>>
>> Cheers,
>> Magnus
>>
>