Computers and Mods

More parts and wiring modifications for Earthquake

My BayBus arrived today. I decided to order a BayBus from PCmods instead of building my own. After thinking about it for a bit, I realized that each DPDT switch cost 5 bucks and the BayBus cost 20 bucks with four switches. I save no money doing it myself and I get a much higher quality device by purchasing theirs. I guess I’ll be working on my fans today.

For prosperity, here is a diagram of the three position 12v-off-7v trick to undervolt fans for lower noise (and throughput, of course):


This is akin to the 7 volt fan modification from but it uses a three position switch to control it at two speeds.

More Earthquake case design

I’ve been working on the case this week. Working with fresh cut metal minus gloves equals tiny little slashes all over my fingertips.

At any rate, I think I’m going to try a little experiment with my case. My current setup resembles this:


There was space enough in the lower front of the case to secure an 80mm fan between the radiator and pump. This way there is fresh air being blown into the case and the intake isn’t limited to merely the hot air being sucked through the radiator.

Although I know that fans cool better when they blow on the object rather than suck away from the object, I’m going to see if this method will suffice for the cooling of the two 10k RPM SCSI hard drives up top in back.






If I’m not happy, I’ll just reverse the 80’s from suck to blow and install a chimney fan.

Maybe I’ll do that anyway, just to see how effective both methods are. Depends on how motivated I am…

Earthquake Gear Arrives

I’ve collected all my gear and it’s sitting in a juicy collection of boxes in my laundry room, waiting to be assembled. In going through the layout and setup it looks like the 90 degree 4″ elbow join that I was going to use for a duct is going to be too damn big. That radiator is a big mofo. The rad + fan combo pushed the duct into the PCI slot area on the motherboard tray. Not good considering I’ll have something like 6 slots full of cards.

I did have some layout questions that I’m looking for answers on [H]ardOCPGideontech and The Tech Zone.

Basically, I’m looking for a quiet and well-cooled rig (aren’t we all?) and would like to reduce the number of fans spinning, which is why I’m going for a watercooled solution. Well, that plus it’s a rockin’ idea.

I’m looking at two possible setups:


Option one:

I put one 120mm fan at the bottom with the radiator, sucking air in and 2x 80mm fans at the top pulling air out.

This way there’s only three fans spinning and I get airflow through the radiator and over the hot SCSI drives.

Question: Will this be enough airflow to keep the drives cool as well as keeping the overall case temp near ambient?





Option Two:

I add a 120mm Chimney fan up top to pull all the hot air in the case up and out and reverse the flow on the 2x80mm fans so they blow directly onto the SCSI drives.

What’ll be the temp difference in the case and of the drives?



A PC named Earthquake

Earthquake is my principal tweak-toy, digital audio workstation and game player. I know that everyone at AudioForums would flame that you aren’t supposed to have anything but DAW stuff on a PC that will be recording audio, but oh well.

I will be posting about my four main PCs: Eathquake, Headcrash, Locust and Plague. These PCs are so named after the four Unix machines in the UC Berkeley computer lab underneath Davis Hall.

Remember: Gnome smoking will kill you.