[Mac Daddy]

Well I don't have time to add anything this morning but will tonight after work. This was inspired by a few of us geeks here that are also musicians.

The idea came up here have fun

http://www.hardwareheaven.com/off-topi...-old-dell.html

[Tyrsonswood]

Good call Dave............. With the way things worked out "Dad's old Dell" will probably not be used for music being a stripped down overclocker now, but I have that other Dual PIII that I'm working on which will be part of the studio......... and all my other systems fit the "old junk" class also. I use the word "Junque" though around here...

[GigaWatt]

GREAT...

finally opened... ... hope some good discussions will be posted here...

[procupine14]

Now I have an excuse to dig around in my storage closet. HOORAY!

My issue is that there is a large gap in the middle of my 'junque'. I have OLD stuff and then some as of the past few years stuff. Nothing in the middle here. But that's also because all that stuff got funneled into an HTPC and my parents' computer.

[Mac Daddy]

Cool glad you liked the idea guys

I have had this up to 3.6G but these are "100 percent stable" settings and I run this machine 24/7. Will get some pics of the rear AC chassis fan and the 120mm AC fan I added to the Katana2 this weekend

FEEL THE POWER !!

This has 2 pin Mods:

- 533 FSB
- 1.65 Vcore

[GigaWatt]

the multiplyer factor is 26... ... a first see for me...

but why is the RAM frequency so low...? 93.1MHz for DDR1 modules...?

[Mac Daddy]

The BIOS doesn't have a RAM divider so the 533 FSB pin mod allowed me to drop the RAM ratio.

(Also that is CPU-Z so 93.1 x 2 = 186.2)

[GigaWatt]

Originally Posted by Mac Daddy

The BIOS doesn't have a RAM divider so the 533 FSB pin mod allowed me to drop the RAM ratio.

(Also that is CPU-Z so 93.1 x 2 = 186.2)

so the actual clock of the RAM modules is 186.2MHz, right...? and what were the default clocks on the modules/module...?



btw, a 20% (19,45% actually but who cares ) on a Celeron CPU ... what kind of cooling are you running on that thing LOL ...

[Mac Daddy]

Running OCZ Platinum PC-3200 (default 400Mhz)

Using a Scythe Katana2 with a 120mm Arctic cooling fan

EDIT: Hmm something is funny let me check with Everest tonight. It should be 186.2 ... 186.2 x 2 = 372.4Mhz as DDR400 is set in BIOS and it underclocks the RAM due to the FSB mod.

[Tyrsonswood]

What's your PCI bus run at? Stock 33mhz............. Sound cards don't make good overclocking material....

[Mac Daddy]

The pinmod is too the CPU itself and should lower anything on the NB and SB O/Cing

[Tyrsonswood]

I'm going to be setting this one up for mixing more than recording. I'm not going dual sound cards in this so recording will be 4 channels max. But dual processors can handle multiple VST effects on multiple channels with ease in Reaper DAW. The Audigy card also has 8 outputs if I need that option. (no Audigy drive on this one)

XP boots off the 20gig IDE and the 70gig SCSI is for audio files only...... That drive is pretty quick compaired to IDE......... fast access time and a 10k drive speed........... love that spin up sound

At the moment it's a single 512mb stick, board will go to 1.5g max ram. It's a server so there's no non-ecc ram happening here...... REG Buffered ECC only. (I can find 2X512 pretty cheap on the bay) The dual 1.2 PIIIs runs ecc cache and that can't be shut off. This board can't be overclocked like the dual board in "Dad's old Dell", but should be a nice stable addition to the studio.

I added the two Aero Cool HSF just because I could and I had them...... they were quite a squeeze and required some slight mods to clear the caps and to fit a socket 370....... I need to figure out how to control speed on these, they run a tad loud..... not bad but this system doesn't run hot so they could slowdown some......

Anybody got a schematic for a low cost fan speed control?

[Judas]

damn...

next on my list is a dual cpu multi core setup....

(couldn't imagine a system with 2 Coolermaster V10's in it)

[Judas]

Mac, is that the cpu i sent you?

[Mac Daddy]

Originally Posted by Tyrsonswood

Anybody got a schematic for a low cost fan speed control?

How elaborate did you want to get? I can design you something custom if you like

Originally Posted by Judas

Mac, is that the cpu i sent you?

Yes it is Bro and at that O/C both CPU and mobo sensors idling @ 32C

[GigaWatt]

Originally Posted by Tyrsonswood

Anybody got a schematic for a low cost fan speed control?

damn ... looks like i'm a mindreader... LOL

http://www.hardwareheaven.com/off-topi...ld-dell-3.html

Originally Posted by GigaWatt

did some great modifications on that case Ty...

since i know you know how to assemble and disassemble stuff, solder, etc. here is a little schematic of a fan control circuit...



the LM317 IC can be changed with any kind of a 78XX voltage stabilizer (example, 7805 - +5V stabilizer, 7812 - +12V stabilizer) and you can change the thermistor with a pot of some vale between 20KOhm and 50KOhm, solder it like rheostat (see pic below) and you're done...

[Tyrsonswood]

That circuit could run a bunch of fans, couldn't it? What's max current on a LM317?

[GigaWatt]

the LM317 could sustain up to 1.5A going through it... with an appropriate thermal sink of course, but with no thermal sink, it coul probably sustain up to 0.8A...

the 78XX series can sustain up to 1A with a little thermal sink, and up to 0.5A with no thermal sink...

so the choice is yours, the LM317 is a little bit more expensive then the 78XX series but more reliable and stable as an IC, the "deltaV" factor (the voltage stability factor) is a little lower on the LM317 (which means more stable voltages), but that shouldn't matter since it's cooling the circuit is intended for (coolers can run on just about any kind of voltage, as long as it's DC LOL )

EDIT: not a bad idea to put in capacitors on the IN and OUT part of the schematic... the IN capacitor can be with a 1uF value (20V workable voltage should be enough) and the OUT capacitor can be anywhere between 0.1uF and 47nF (also, 20V workable voltage)...

[Mac Daddy]

Not a bad idea but I am sitting here looking at a case using 2 x 180mm fans rated 12V @ 0.9A each.

You can use a voltage regulator as GigaWatt mentioned a great idea but you can also use Triacs for this or simple rheostats ... like I said how elaborate do you want to get?

[Tyrsonswood]

Not too fancy...... trying to find something cheap (or free..... I've a lot 'o junque here) This PSU has the lower speed "fan" circuit and I could use that but it's already running the hard drive fan so thinking a different circuit for the cpu coolers. I'll still monitor the fan speed as stock, just adjust the voltage/speed at a knob.


Anyways, Here's some specs. Not lightening fast but for what it can do.... $30.00 Not bad.




Edit; Tiny pic........ sorry about that. making you squint and all.............

[Mac Daddy]

You could also expand on the PSU low circuit .. let me think on this and get back to you Bro

[Tyrsonswood]

It runs about 5-8% less cpu usage running the audio off the SCSI HD than off IDE.


Just a demo song but was running at about 50% cpu usage, roughly even on each core, but different graphs, they were each doing half the load as was expected........ and nicely too.

[Mac Daddy]

Cool

[GigaWatt]

Originally Posted by Mac Daddy

You can use a voltage regulator as GigaWatt mentioned a great idea but you can also use Triacs for this or simple rheostats ... like I said how elaborate do you want to get?

i don't know... :S... a simple rheostat circuit would probably burn the sensitive resistor layer of the pot...

Originally Posted by Tyrsonswood

Edit; Tiny pic........ sorry about that. making you squint and all.............

yep... it sure made me squint... can't really read anything... my damn nearsightness... LOL ... maybe some larger pics...?

[Mac Daddy]

Originally Posted by GigaWatt

i don't know... :S... a simple rheostat circuit would probably burn the sensitive resistor layer of the pot...

Well we have rheostats at work that would handle more current than that voltage regulator

I would use something pulse width modulated for fans not using a 4 pin design. Like I said depends how fancy he wants to get.

[GigaWatt]

Originally Posted by Mac Daddy

Well we have rheostats at work that would handle more current than that voltage regulator

maybe.. it all depends on what kind of a pot you are using, the power drain of the coolers, the power that that particular pot could sustain... many factors are involved in that "equation", so i wouldn't dismiss an actual burned pot in the solution of the "equation"... regular pots (the ones you could fin your regular radio shack) probably couldn't sustain a 0.9A amps circulating through them... so i wouldn't recommend it...

Originally Posted by Mac Daddy

I would use something pulse width modulated for fans not using a 4 pin design. Like I said depends how fancy he wants to get.

too fancy for my taste... it's just a cooler, not a motherboard of PC... LOL

but, as you said... it all depends on how fancy you wanna get...

[Mac Daddy]

We have rheostats at work that control audio output sections of 12V car radios still

Like you said depends how complicated one wants to make it. The simplest one I have seen is a 3 speed controller using power resistors and a switch. There are heavier voltage regulators available as well but they come in larger cases like TO-3 and might be a pain to mount.

EDIT: Another thing to note is if you are using a rheostat or power resistor you are only sinking the current not being used by the fan. If you are using a regulator all the current is being passed through the regulator.

[GigaWatt]

Originally Posted by Mac Daddy

Like you said depends how complicated one wants to make it. The simplest one I have seen is a 3 speed controller using power resistors and a switch. There are heavier voltage regulators available as well but they come in larger cases like TO-3 and might be a pain to mount.

that's actually a pretty good idea... didn't think of it till now... a 3 or 4 resistor chained link and a 3 or a 4 position switch would be the simplest possible solution... not the most inexpensive one, since all the resistors would have to sustain at least 1W of power going through them, but the simplest one nevertheless...

the donwside to this circuit is that you have to change the power values of the resistors every time you would like to add another cooler in the circuit... :S... or you could just put in 10W resistors in the start and not worry at all... LOL

and about the TO-3 voltage regulators... since you mentioned them, i would definitely go with them... the LM340K-12 (a 12V voltage stabilizer) could sustain up to 3A of output current with a heatsink... more than enough... ... without any heatsink, it should sustain 1A with no problem... ... i have a LM323K (5V, 3A stabilizer) and a LM340K-12 powering a old CD-ROM used as a CD player in my sisters room, no heatsinks whatsoever, they don't dissipate that much heat...

Originally Posted by Mac Daddy

EDIT: Another thing to note is if you are using a rheostat or power resistor you are only sinking the current not being used by the fan. If you are using a regulator all the current is being passed through the regulator.

exactly... that's why i wouldn't use just a rheostat... what if tend to put the pot in the minimal position most of the time... that would mean that most of the time all the current that's supposed to go through the fan would go throug the pot... that would burn a regular pot in no time...

[Mac Daddy]

On the resistor idea I think 10W resistors and a switch is nice and simple should work well.

On the rheostat your probably going to be running the fan at 50 to 75 percent most of the time. Keep in mind as well these fans I mentioned at 0.9 amp are not standard they are huge and high CFM.

[Tyrsonswood]

Well we don't need to reinvent the wheel....... Just wanting to slow down some fans......


I rehoused this system yesterday, pics later, so some things have changed, but I still want some fan controls of some sort....... Low $$$ is a prime concern..... salvaged parts even better.