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power consumption % on Make Noise power bus board
MUFF WIGGLER Forum Index -> Eurorack Modules  
Author power consumption % on Make Noise power bus board
j_dowe
I'm using a 208 hp case that has the following power:

Make Noise power bus board
Total power: 1.4A of +12v, 1A -12, 250ma +5

According to modular grid I will be at 1137 mA +12V | 704 mA -12V once I add the last couple of modules I'm considering.

This puts me at around 81-82%, which is above what I've seen recommended (Learning Modular says "you want this total consumption to only be about 70% or 80% of the current that your power supply can deliver").

Am I being too cautious to move one of the modules to another case (I have another case that is partially filled w/ deeper modules, but I'd prefer to keep my main modules in this case), or is it pretty much safe to be at under 82%, considering that Make Noise says "conservative current rating ... averaging 92% efficiency" (whatever that means).

Any advice from the experts. we're not worthy
Dave Peck
You're probably still fine, unless you have modules that are especially finicky about their power source and/or unless the power supply you are using is subjected to excessive heat by being confined in a tight enclosure with no vents etc.

In any case, running your power supply at around 80% capacity isn't likely to do anything that could damage a module, although it may be putting stress on the power supply itself that could increase the likelihood of the power supply failing somewhat sooner than it would have otherwise.
ranix
industry standard best practice for consuming power from any emitter is to cap consumption at 80% maximum capacity. If you were being serious you'd also measure DC inrush but this is probably unnecessary
gentle_attack
Interesting, I will be watching this thread and see if there are any counter opinions.

I am interested in (eventually) adding a skiff in front of my SS and possibly plugging in a couple of the black uMutable stuff (uBraids, uRings, uBurst) into my 7u case, but am in a similar predicament as that would ideally move the touchplate (extremely low consumption) modules to the skiff, and would cluster all of the digital MN, plus these digital modules, bringing me, like the OP, into 1100 mA territory. I did not think I'd be running into trouble at just under 79% but if people have encountered problems, I will rethink this.
digitalohm
i have the elite modular 12U case with Make Noise power boards. One of the sides I was using at around 1380mA consumption which is pushing it pretty hard and I didn't have any issues.

The other side was around 1180mA and I had one module that would sometimes require a case restart to power up.

At one point in time this case was completely full of make noise modules and I didn't have any power issues.

That said...I am replacing the make noise power with intellijel tps80w this week or next. The modules I want to put in would put me over the 1.4A limit, and I would like to be closer at the 80% rule to hopefully prevent something like that from biting me later.
merlatte
whoops...
merlatte
digitalohm wrote:


That said...I am replacing the make noise power with intellijel tps80w this week or next. .


Did you happen to get around to this yet? I'm considering the same thing and was wondering if the holes for the tps80w will/won't line-up with the screwholes from the MN.
desolationjones
This is not a recommendation, just an n=1 datum: I am pulling 1600 mA @ 12 VDC (106% cap.) / 900 mA @ -12 VDC (90% cap.) on a Make Noise Shared CV PSU without any audible problems. I expect that the increased thermal load is decreasing the lifespan of my regulators, though.
Mungo
merlatte wrote:
digitalohm wrote:
That said...I am replacing the make noise power with intellijel tps80w this week or next. .
Did you happen to get around to this yet? I'm considering the same thing and was wondering if the holes for the tps80w will/won't line-up with the screwholes from the MN.
Intellijel active bus boards have the least common hole spacings, they don't line up with any of the other brands.
Foghorn
ranix wrote:
industry standard best practice for consuming power from any emitter is to cap consumption at 80% maximum capacity. If you were being serious you'd also measure DC inrush but this is probably unnecessary


When and where I grew up, it was considered important to keep load down to 83.33%.
...........83.33% ???
Actually it is 5/6 or 83.33%
But that is just a rule of thumb, no doubt made up by somebody with an extra finger, or.....
Yea.

Hogforn
Mungo
Foghorn wrote:
ranix wrote:
industry standard best practice for consuming power from any emitter is to cap consumption at 80% maximum capacity. If you were being serious you'd also measure DC inrush but this is probably unnecessary


When and where I grew up, it was considered important to keep load down to 83.33%.
...........83.33% ???
Actually it is 5/6 or 83.33%
But that is just a rule of thumb, no doubt made up by somebody with an extra finger, or.....
Yea.

Hogforn
To be fair the Make Noise power says it has plenty of headroom available, which is backed up by experiences of people in here and the specifications of their parts well beyond what they claim. Its one of the more trustworthy supplies available. A less reputable manufacturer might have called it 12V/-12V/5V 3A/3A/1A going on how some other supplies are specified. But Make noise have been very clear and said while it will provide more current than their specification the power quality is poorer and they don't recommend using more than the 1.4A/1A/250mA (1A or 1.4A 5V in some models)
digitalohm
merlatte wrote:


Did you happen to get around to this yet? I'm considering the same thing and was wondering if the holes for the tps80w will/won't line-up with the screwholes from the MN.


I did. The boards do not line up with the holes (assuming we are talking elite modular case). The mounts are simply wood screws with plastic shaft stands, so you position the board where you want and apply a bit of pressure to screw them in. This was a good thing as it allowed me to position one of the boards a bit towards the side so that I could fit some deeper modules.

The installation was simple and fast, and I was able the prexisting switches and barrel connectors, so all i had to do was mount the boards, and crimp a new connector to the wires.

I'm extremely happy with the tps80w upgrade too, plenty of power for my current setup.
gentle_attack
Foghorn wrote:
ranix wrote:
industry standard best practice for consuming power from any emitter is to cap consumption at 80% maximum capacity. If you were being serious you'd also measure DC inrush but this is probably unnecessary


When and where I grew up, it was considered important to keep load down to 83.33%.
...........83.33% ???
Actually it is 5/6 or 83.33%
But that is just a rule of thumb, no doubt made up by somebody with an extra finger, or.....
Yea.

Hogforn


This made me smile
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