MOTM

Hi all - I built a two row case (20U in each row) for my MOTM-based  
modular.  In it now are a 900 PS, a 440 and a 110; finishing up an  
800 EG kit and will be adding some DIY modules next.  Right now there  
is a back panel that slides on and off but it is rather kludgey and  
rattles at certain bass frequencies.  I'm thinking of just screwing  
it in place, making the case more or less "air tight", aside from  
whatever air passes through the front panel jacks or tiny "slop"  
spaces between modules.  Will I get too much heat build-up in the  
case with no air circulation?  I'd like to keep the dust out as much  
as possible (and not drill ventilation holes in the back panel).  For  
some reason my studio gets rather dusty, though I take pains to  
prevent it.

Thanks,
ld

Ventilation through the jack holes should be sufficient. There isn't much
heat generated from small linear supplies, as compared to what you have in
your computer, for instance.

John Loffink
The Microtonal Synthesis Web Site
http://www.microtonal-synthesis.com
The Wavemakers Synthesizer Web Site
http://www.wavemakers-synth.com

> -----Original Message-----
> From: motm@yahoogroups.com [mailto:motm@yahoogroups.com] On Behalf Of
> Larry David
> Sent: Friday, August 03, 2007 12:27 AM
> To: MOTM List
> Subject: [motm] heat buildup?
> 
> Hi all - I built a two row case (20U in each row) for my MOTM-based
> modular.  In it now are a 900 PS, a 440 and a 110; finishing up an
> 800 EG kit and will be adding some DIY modules next.  Right now there
> is a back panel that slides on and off but it is rather kludgey and
> rattles at certain bass frequencies.  I'm thinking of just screwing
> it in place, making the case more or less "air tight", aside from
> whatever air passes through the front panel jacks or tiny "slop"
> spaces between modules.  Will I get too much heat build-up in the
> case with no air circulation?  I'd like to keep the dust out as much
> as possible (and not drill ventilation holes in the back panel).  For
> some reason my studio gets rather dusty, though I take pains to
> prevent it.
> 
> Thanks,
> ld
> 
>

Personally, I would leave a small (say 1/4") gap at the top edge of the back 
cabinet. More dust will get in through the jack holes than this slit, but 
the slit will still let the heat escape.

Paul S.

My cabinets are all completely closed.  I worry more about dust and 
contamination than heat (I also live on a gravel road so there is 
LOTS of dust).  I elevated my power supplies in the cabinets on 1" 
aluminum frames so that there is air flow around all 6 sides of the 
supply.  I also don't load them anywhere near rated capacity. Heat 
rise is negligible although I have never specifically measured it.

Dave

--- In motm@yahoogroups.com, Larry David <larrydavid777@...> wrote:
>
> Hi all - I built a two row case (20U in each row) for my MOTM-
based  
> modular.  In it now are a 900 PS, a 440 and a 110; finishing up 
an  
> 800 EG kit and will be adding some DIY modules next.  Right now 
there  
> is a back panel that slides on and off but it is rather kludgey 
and  
> rattles at certain bass frequencies.  I'm thinking of just 
screwing  
> it in place, making the case more or less "air tight", aside from  
> whatever air passes through the front panel jacks or tiny "slop"  
> spaces between modules.  Will I get too much heat build-up in the  
> case with no air circulation?  I'd like to keep the dust out as 
much  
> as possible (and not drill ventilation holes in the back panel).  
For  

> some reason my studio gets rather dusty, though I take pains to  
> prevent it.
> 
> Thanks,
> ld
>

Thanks everyone.  For now I'll keep it closed and maybe open a slit  
on the top per Paul's recommendation once it starts to fill up  
(which, at the rate I've been going, will be when cars fly - watched  
the director's cut of Bladerunner last night, set in L.A. in 2019,  
with flying cars and all...)

ld

On Aug 3, 2007, at 2:31 PM, djbrow54 wrote:

> My cabinets are all completely closed.  I worry more about dust and
> contamination than heat (I also live on a gravel road so there is
> LOTS of dust).  I elevated my power supplies in the cabinets on 1"
> aluminum frames so that there is air flow around all 6 sides of the
> supply.  I also don't load them anywhere near rated capacity. Heat
> rise is negligible although I have never specifically measured it.
>
> Dave
>
> --- In motm@yahoogroups.com, Larry David <larrydavid777@...> wrote:
>>
>> Hi all - I built a two row case (20U in each row) for my MOTM-
> based
>> modular.  In it now are a 900 PS, a 440 and a 110; finishing up
> an
>> 800 EG kit and will be adding some DIY modules next.  Right now
> there
>> is a back panel that slides on and off but it is rather kludgey
> and
>> rattles at certain bass frequencies.  I'm thinking of just
> screwing
>> it in place, making the case more or less "air tight", aside from
>> whatever air passes through the front panel jacks or tiny "slop"
>> spaces between modules.  Will I get too much heat build-up in the
>> case with no air circulation?  I'd like to keep the dust out as
> much
>> as possible (and not drill ventilation holes in the back panel).
> For
>> some reason my studio gets rather dusty, though I take pains to
>> prevent it.
>>
>> Thanks,
>> ld
>>
>
>
>
>
>
> Yahoo! Groups Links
>
>
>

When I built my cabinets I asked Paul about
ventilation in the cabinets and he said the air from
the jack holes was all that was needed, I have 5 power
supplys and there has never been any heat at all.  My
studio is airconditioned but I am in Miami Florida and
it is hot as hell year round.  I have left the back of
my cabinets open because I like to look at the
electronics knowing that I built most of the unit.  My
power supplys are mounted on the back of the cabinets,
one blacet power supply 3 motm 900 and one motm 950.

Never had any noise issues at all. 
john



--- djbrow54 <davebr@...> wrote:

> My cabinets are all completely closed.  I worry more
> about dust and 
> contamination than heat (I also live on a gravel
> road so there is 
> LOTS of dust).  I elevated my power supplies in the
> cabinets on 1" 
> aluminum frames so that there is air flow around all
> 6 sides of the 
> supply.  I also don't load them anywhere near rated
> capacity. Heat 
> rise is negligible although I have never
> specifically measured it.
> 
> Dave
> 
> --- In motm@yahoogroups.com, Larry David
> <larrydavid777@...> wrote:
> >
> > Hi all - I built a two row case (20U in each row)
> for my MOTM-
> based  
> > modular.  In it now are a 900 PS, a 440 and a 110;
> finishing up 
> an  
> > 800 EG kit and will be adding some DIY modules
> next.  Right now 
> there  
> > is a back panel that slides on and off but it is
> rather kludgey 
> and  
> > rattles at certain bass frequencies.  I'm thinking
> of just 
> screwing  
> > it in place, making the case more or less "air
> tight", aside from  
> > whatever air passes through the front panel jacks
> or tiny "slop"  
> > spaces between modules.  Will I get too much heat
> build-up in the  
> > case with no air circulation?  I'd like to keep
> the dust out as 
> much  
> > as possible (and not drill ventilation holes in
> the back panel).  
> For  
> > some reason my studio gets rather dusty, though I
> take pains to  
> > prevent it.
> > 
> > Thanks,
> > ld
> >
> 
> 
> 



       
____________________________________________________________________________________
Moody friends. Drama queens. Your life? Nope! - their life, your story. Play Sims Stories at Yahoo! Games.
http://sims.yahoo.com/

My bottom cabinet is a dot com double high slant cabinet, seen here:

http://www.pugix.com

Look at the photo.  Notice the open space where end caps would go on the 
top half.  (See the SynthTech Logo end cap below, on the right.)   That 
big cabinet has one large power supply.  The back is enclosed.  I do 
feel warm air emitting from the open slots at either end on the top 
half.  The single height cabinets above have had their backs removed, so 
there is no concern about heat for those.

Richard Brewster

Larry David wrote:

> Hi all - I built a two row case (20U in each row) for my MOTM-based  
> modular.  In it now are a 900 PS, a 440 and a 110; finishing up an  
> 800 EG kit and will be adding some DIY modules next.  Right now there  
> is a back panel that slides on and off but it is rather kludgey and  
> rattles at certain bass frequencies.  I'm thinking of just screwing  
> it in place, making the case more or less "air tight", aside from  
> whatever air passes through the front panel jacks or tiny "slop"  
> spaces between modules.  Will I get too much heat build-up in the  
> case with no air circulation?  I'd like to keep the dust out as much  
> as possible (and not drill ventilation holes in the back panel).  For  
> some reason my studio gets rather dusty, though I take pains to  
> prevent it.
>
> Thanks,
> ld
>
>
>  
> Yahoo! Groups Links
>
>
>
>
>