Oberheim,Memory Moog and naked men in africa!

[Paul Maddox]

BJ,

> Seriously, looking at the OB Xpander i was
> suppriced to find that they used a switched
> mode power supply? Now haven't you all said
> from time to time that a switched ps is no no!

Hehehe, I used a switch mode in my MonoWave,
ask Tony, Peter, Magnus and all the others who've heard it
how it sounds... :-)

I think as long as you're not useing VCOs it should be ok..
and as long as theres enough smoothing cap there it doesnt matter.

> Oberheim has put a lot of efforts into get
> smooth DAC step transitions by using RC lag
> nets on the 14 bit DAC. 

The PPG Wave also does this.. suprisingly with 2 SPST switchs,
a cap and TWO resistors, giving 3 variable time constants for smoothing,
hence the REALLY long Attack/decay/release times which are stepless.

 
>On the
> other hand i can understand why they used
> such a power supply, the 3 displays of course
>

Yep, remember MOST VFDs use about 0.5A so if youy got three
in there you're looking at 1.5A.. also remember CMOS isnt the lowest
power consumption in the world..
 

Paul Maddox