SV: RE: [sdiy] Multiple Voltage Power Supply / design problem!

[mark verbos]

Buchla's 200e is powered from a 12 volt wall wart with a DC-DC  
converter to make the +/-15 volts and +5 volts. Actually, the 214  
power supply used in the Music Easel was a DC-DC converter made from  
discrete parts to take a 12 volt DC input from a big transformer or  
Battery and convert it into +/- 24 then regulate that down to the +5  
and +/-15.

I have reverse engineered this circuit if you want to see it....
http://www.simple-answer.com/214_schem.jpg

Good luck getting the power transistors in there tho. You can use  
some other big fat ones .



Mark




On May 16, 2007, at 3:07 PM, John Luciani wrote:

> On 5/16/07, Roy J. Tellason <rtellason at verizon.net> wrote:
>> On Wednesday 16 May 2007 13:27, Colin Hinz wrote:
>> >  On Tue May 15 23:31 , "Roy J. Tellason"  sent:
>> > >I had *one* UPS that wanted a total of _ten_ small batteries for
>> > > replacement, as compared with typically one or two in the rest  
>> of the
>> > > ones that I've encountered.
>> > >
>> > >Too bad I can't seem to find any switchers which will accept a
>> > > lower-voltage DC input.
>> >
>> > Roy,
>> >
>> > "Lower-voltage" means how low? And what sort of outputs are you  
>> needing.
>>
>> No immediate needs,  instability of circumstances here precludes  
>> me getting
>> much going in the way of construction projects,  but it'd be neat  
>> to be able
>> to run things off 12V batteries or automotive power in general.
>>
>> Instead most of the switchers I run across seem to want line  
>> voltage or double
>> that.
>
> Vicor (www.vicr.com) has a wide range of DC-DC converters. For a 12V
> input your options are limited to VI-20x or VI-2Vx series devices. If
> you can wire your
> batteries to get to the telecom range (48V) there are a wide range  
> of options
> including their 3rd generation of converters (V*I Chips) with
> efficiencies above 90% and a
> a power processing capability of 1000W/in^3.
>
> For low power designs where size is not crtical the Vicor converters
> can be expensive. For
> high power or dense layouts Vicor offers an excellent solution.
>
> (* jcl *)
>
> -- 
> http://www.luciani.org
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy