Analogue systems

Looking for a 1/4-1/8 & 1/8-1/4 jack converter.
MOTM has the MOTM-940 patchpanel, are there any other options?

/Boward

so there is no chance that ill blow anything up if fed +/-15V CV to
a +/-12V module, using the RS270?
By the way..which manufacturers use banana jacks?
And are 6,3m stackable?



--- In analogue_systems@yahoogroups.com, Peter Grenader <peter@b...> 
wrote:

> Analogue Systems makes a fine one themselves.
> 
> 
> boward_k wrote:
> 
> > 
> > 
> > Looking for a 1/4-1/8 & 1/8-1/4 jack converter.
> > MOTM has the MOTM-940 patchpanel, are there any other options?
> > 
> > /Boward
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > Yahoo! Groups Links
> > 
> > 
> > 
> > 
> > 
> > 
> >

Analogue Systems makes a fine one themselves.


boward_k wrote:

> 
> 
> Looking for a 1/4-1/8 & 1/8-1/4 jack converter.
> MOTM has the MOTM-940 patchpanel, are there any other options?
> 
> /Boward
> 
> 
> 
> 
> 
> 
> 
> Yahoo! Groups Links
> 
> 
> 
> 
> 
> 
>

Feeding 15 volts to a 12 volt module is in fact dangerous.  But I'm not sure
this is what you're referring to.

1) If you mean can you power a 12 volt module with 15 volts - don't do it.
One, your warranty will blow along with the module.  Not all 12 volt modules
will die if you do this, most will  and those who could take it will not
behave as they are designed to.  It's all about a thing called Ohms Law:

R=E/I where R is resistance, E is voltage and I is current.  This means that
if the voltage increases across a resistor, so will it's current consumption
and output.  This means that parts of the circuit which are expecting a
certain current range will be seeing more - 125% more.  While in many
instances this will fry that section, best case it will give you abnormal
results.  

A VCO for instance - all voltage control, including the freq knobs, ends up
producing a variable current source which is injected into the oscillation
ring of the module's core.  You increase the supply voltage, those limits
also increase.  If it doesn't blow, expect to see a very oddball freq range
as a result.

The ONLY way to fix this is replace every resistor which is designed to pass
current by the value (via Ohm's Law) it would require to pass the same
amount of current given a 15 volt supply source (for instance, if there was
a 12K resistor before, it would need to be changed to 15K and so on).  Not
only will this effect your warranty, on a VCO alone probably two thirds of
the resistors are limiting or controlling current.   Add it up quick and
purchasing a +/- 12 volt supply starts to sound real real cheap.

2) If you are referring to just interfacing a 15 volt module with a 12 volt
one, giving the unit more voltage than it's own op amps are powered from.
Latch up and possibly the big fry could ensue.  A cautionary note:  You
should not feed an op amp with anything more than  about 1 volt less than
it's VCC.

...but (BIG butt here) keep in mind that just because a module is powered
from +/-15 doesn't at all mean there's anything close to that coming out
output jacks.  For instance, Modcam's operating range is pretty much 0-6
with some exceptions.  Blacet, Wiard and Buchla run about 10 volts, with a
slight exception of the trigger outputs of Buchla ranging betwen 12 and
15-ish.  Outside of the Buchla trigger level, all these are fine with Bob's
gear.

I'm interfacing Blacet and MOTM with my A. Sys equipment all day long
without so much as a hick-up.  Check with the Manufacturer of the module
you're thinking of interfacing.  If it's signals are less than 12 volts,
you're golden.

Hope this helps,

- P


boward_k wrote:

> 
> 
> so there is no chance that ill blow anything up if fed +/-15V CV to
> a +/-12V module, using the RS270?
> By the way..which manufacturers use banana jacks?
> And are 6,3m stackable?
> 
> 
> 
> --- In analogue_systems@yahoogroups.com, Peter Grenader <peter@b...>
> wrote:
>> Analogue Systems makes a fine one themselves.
>> 
>> 
>> boward_k wrote:
>> 
>>> 
>>> 
>>> Looking for a 1/4-1/8 & 1/8-1/4 jack converter.
>>> MOTM has the MOTM-940 patchpanel, are there any other options?
>>> 
>>> /Boward
>>> 
>>> 
>>> 
>>> 
>>> 
>>> 
>>> 
>>> Yahoo! Groups Links
>>> 
>>> 
>>> 
>>> 
>>> 
>>> 
>>> 
> 
> 
> 
> 
> 
> 
> 
> Yahoo! Groups Links
> 
> 
> 
> 
> 
> 
>