Mark, why don't you hustle over to the MOTM catalog website and pick up
that last MOTM-950 kit, especially if you plan to order the MOTM-730 VC
Pulse Divider that will probably be the next MOTM module released in
standard format -- don't quote me ;)
One disadvantage of adding a separate +5V supply is wiring it up. If
you're cool with that, it is an option. But stay away from the
switching supplies! You don't want that noise near your modular. All
my supplies are Power One. These are reasonably priced and available
from Digikey.
Why did John Blacet use large, multiple, electrolytic caps for
decoupling? One reason could be that Blacet the modules have a lot of
chips on them and different sections of circuit that need to be
isolated. Sometimes it is better to over-engineer. Too much decoupling
is generally better than not enough. Some drawbacks of using big caps:
takes up extra space; is a tad more costly; and of course the problem
with power supply startup.
-Richard Brewster
http://www.pugix.comMark wrote:
> I am at the point where I should consider buying a another power
> supply for my modular. At the this point in time, I don't have any
> modules that require 5V, nor are there any MOTM modules currently
> available that I am considering that require 5V (I already have a
> MIDI-to-CV converter). I'm wondering if I should get a triple supply
> that provides 5V or another supply that only provides -15/15+??
>
> Is there any disadvantage in adding a separate 5V supply at a later
> time?? Further, since it isn't used to power the signal path,
> is there a disadvantage in using a 5V switching supply?? They are
> much less expensive than 5V linear supplies.
>
>
> Also, while I'm typing, does anyone know why the Blacet modules use
> such a massive amount of bypass capacitance?? The MiniWave and
> TimeMachine have ~270uF and ~320uF respectively, using two 100uF caps
> and a bunch of 10uF caps, with very few smaller caps. Does anyone
> know why that is??
>
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> Yahoo! Groups Links
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