Driver to drive?

[Tim Wescott]

On Thu, 18 Jul 2013 06:52:24 -0700, Joerg wrote:

josephkk wrote:
On Tue, 16 Jul 2013 09:19:38 -0700, Joerg wrote:


Plus an opamp for the PID. Can't do it with XOR alone because that
results in a frequency-dependent phase error.

It's a pity that all the sinewave oscillators such as XR2206 and
ICL8038 have been obsoleted. Those could easily be FM-modulated,
something that is a real hassle with DDS chips.

Jeorg,
How about a varactor tuned Wein bridge oscillator an FTDI chip, a micro
(PIC, AVR. etc.,), mostly to handle the FTDI chip, a couple onchip
comparators, then using a counter in the uC count clocks after the
first comparator detects a "zero crossing" of the reference, to the
time the second comparator detect the locked signal zero crossing.
With a touch of logic (possibly external to the uC) this will allow
producing the opportunity of having correction pulses to integrate
every half cycle. It would allow fast phase adjustment and stable lock,
the phase resolution would be determined by the counter clock rate.


The problem with varactor diodes is that pretty much all high
capacitance ones have gone lalaland. Probably because there are no
radios with discrete oscillators and filters anymore.

Not to mention that they distort like crazy. You'd have to keep the
oscillations at very low amplitude, and you'd be challenged by noise
issues.

JFETs are hard to come by and distort, too, but I think they may be
easier to deal with than varactors.

Hey! How about this:

Make a state-space oscillator with two multiplying DACs in it; one for
frequency, and one for damping. Then use a micro to set the DACs. It
should be great fun, and the load on the micro will be light.

It might even take up no more space than the NE 612 solution...

--

Tim Wescott
Wescott Design Services
http://www.wescottdesign.com

 

[John Larkin]

On Wed, 17 Jul 2013 20:03:33 -0700, Jon Kirwan
<jonk@infinitefactors.org> wrote:

On Wed, 17 Jul 2013 19:42:17 -0700, I wrote:

snip
Saturated BJT in the diff-amp?

(The base drive will have to be significant, relative to the
common diff-amp emitter currents. That means a stiff divider.
Gain will also be poor, I believe.)

Jon

Actually, this works better than I thought it would, given the
constraint of no opamps but ignoring the constraint of no mosfets.

https://dl.dropboxusercontent.com/u/53724080/Circuits/Current_Sources/Isrc_LED_String.asc

It servoes Vsrc down to 10s of millivolts. Seems to be closed-loop AC
stable, too.

https://dl.dropboxusercontent.com/u/53724080/Circuits/Current_Sources/Isrc_LED_String.asc

Q2 base current is nanoamps.







--

John Larkin Highland Technology, Inc

jlarkin at highlandtechnology dot com
http://www.highlandtechnology.com

Precision electronic instrumentation
Picosecond-resolution Digital Delay and Pulse generators
Custom laser drivers and controllers
Photonics and fiberoptic TTL data links
VME thermocouple, LVDT, synchro acquisition and simulation

 

[Joerg]

Tim Wescott wrote:

On Thu, 18 Jul 2013 06:52:24 -0700, Joerg wrote:

josephkk wrote:
On Tue, 16 Jul 2013 09:19:38 -0700, Joerg wrote:


Plus an opamp for the PID. Can't do it with XOR alone because that
results in a frequency-dependent phase error.

It's a pity that all the sinewave oscillators such as XR2206 and
ICL8038 have been obsoleted. Those could easily be FM-modulated,
something that is a real hassle with DDS chips.
Jeorg,
How about a varactor tuned Wein bridge oscillator an FTDI chip, a micro
(PIC, AVR. etc.,), mostly to handle the FTDI chip, a couple onchip
comparators, then using a counter in the uC count clocks after the
first comparator detects a "zero crossing" of the reference, to the
time the second comparator detect the locked signal zero crossing.
With a touch of logic (possibly external to the uC) this will allow
producing the opportunity of having correction pulses to integrate
every half cycle. It would allow fast phase adjustment and stable lock,
the phase resolution would be determined by the counter clock rate.


The problem with varactor diodes is that pretty much all high
capacitance ones have gone lalaland. Probably because there are no
radios with discrete oscillators and filters anymore.

Not to mention that they distort like crazy. You'd have to keep the
oscillations at very low amplitude, and you'd be challenged by noise
issues.

JFETs are hard to come by and distort, too, but I think they may be
easier to deal with than varactors.

Hey! How about this:

Make a state-space oscillator with two multiplying DACs in it; one for
frequency, and one for damping. Then use a micro to set the DACs. It
should be great fun, and the load on the micro will be light.

It might even take up no more space than the NE 612 solution...

Not sure about that. Doing it in time domain would require a LUT being
pumped into the DAC at a fairly fast clip. But who knows, maybe there is
a DAC chip that has much of this in there already?

The SA612 isn't ideal. Best would be a chip that has the output of the
RF preamp piped out to a pin. Then you can make a 2nd oscillator from
the preamp and you won't need an extra IC or transistor for it.

--
Regards, Joerg

http://www.analogconsultants.com/

 

[Tim Wescott]

On Thu, 18 Jul 2013 10:52:02 -0700, Joerg wrote:

Tim Wescott wrote:
On Thu, 18 Jul 2013 06:52:24 -0700, Joerg wrote:

josephkk wrote:
On Tue, 16 Jul 2013 09:19:38 -0700, Joerg wrote:


Plus an opamp for the PID. Can't do it with XOR alone because that
results in a frequency-dependent phase error.

It's a pity that all the sinewave oscillators such as XR2206 and
ICL8038 have been obsoleted. Those could easily be FM-modulated,
something that is a real hassle with DDS chips.
Jeorg,
How about a varactor tuned Wein bridge oscillator an FTDI chip, a
micro (PIC, AVR. etc.,), mostly to handle the FTDI chip, a couple
onchip comparators, then using a counter in the uC count clocks after
the first comparator detects a "zero crossing" of the reference, to
the time the second comparator detect the locked signal zero
crossing. With a touch of logic (possibly external to the uC) this
will allow producing the opportunity of having correction pulses to
integrate every half cycle. It would allow fast phase adjustment and
stable lock,
the phase resolution would be determined by the counter clock rate.


The problem with varactor diodes is that pretty much all high
capacitance ones have gone lalaland. Probably because there are no
radios with discrete oscillators and filters anymore.

Not to mention that they distort like crazy. You'd have to keep the
oscillations at very low amplitude, and you'd be challenged by noise
issues.

JFETs are hard to come by and distort, too, but I think they may be
easier to deal with than varactors.

Hey! How about this:

Make a state-space oscillator with two multiplying DACs in it; one for
frequency, and one for damping. Then use a micro to set the DACs. It
should be great fun, and the load on the micro will be light.

It might even take up no more space than the NE 612 solution...


Not sure about that. Doing it in time domain would require a LUT being
pumped into the DAC at a fairly fast clip. But who knows, maybe there is
a DAC chip that has much of this in there already?

I'm not talking about having the audio frequency stuff come out the micro
-- I'm talking about having an all-analog oscillator that happens to be
controlled by multiplying DACs in the signal chain:

.---> integrator ---> mpy DAC 1 ---+---> integrator ----o---->
| A |
| '----- mpy DAC 2 ----o
| |
'-------------------------------------------------------'

Multiply DAC 1 sets the frequency, multiply DAC 2 sets the damping (which
is nominally 0, but which you'll need to nudge around for AGC. Or just
use a two-diode amplitude stabilization, why didn't I think that earlier?)

OK, how about this:

.---> integrator ---> mpy DAC ---+---> integrator ----o---->
| A |
| '------- AGC --------o
| |
'-----------------------------------------------------'

The SA612 isn't ideal. Best would be a chip that has the output of the
RF preamp piped out to a pin. Then you can make a 2nd oscillator from
the preamp and you won't need an extra IC or transistor for it.

D'oh. Of course.

--

Tim Wescott
Wescott Design Services
http://www.wescottdesign.com

 

[Joerg]

Tim Wescott wrote:

On Thu, 18 Jul 2013 10:52:02 -0700, Joerg wrote:

Tim Wescott wrote:

[...]

Hey! How about this:

Make a state-space oscillator with two multiplying DACs in it; one for
frequency, and one for damping. Then use a micro to set the DACs. It
should be great fun, and the load on the micro will be light.

It might even take up no more space than the NE 612 solution...


Not sure about that. Doing it in time domain would require a LUT being
pumped into the DAC at a fairly fast clip. But who knows, maybe there is
a DAC chip that has much of this in there already?

I'm not talking about having the audio frequency stuff come out the micro
-- I'm talking about having an all-analog oscillator that happens to be
controlled by multiplying DACs in the signal chain:

.---> integrator ---> mpy DAC 1 ---+---> integrator ----o----
| A |
| '----- mpy DAC 2 ----o
| |
'-------------------------------------------------------'

Multiply DAC 1 sets the frequency, ...

But how does that produce a clean sine wave where the frequency can be
changed electronically (analog)?

... multiply DAC 2 sets the damping (which
is nominally 0, but which you'll need to nudge around for AGC. Or just
use a two-diode amplitude stabilization, why didn't I think that earlier?)

OK, how about this:

.---> integrator ---> mpy DAC ---+---> integrator ----o----
| A |
| '------- AGC --------o
| |
'-----------------------------------------------------'

It doesn't really need AGC, the amplitude can be set via resistors.
Diodes are out anyhow because that would result in serious sine distortion.

[...]

--
Regards, Joerg

http://www.analogconsultants.com/

 

[Tim Wescott]

On Thu, 18 Jul 2013 13:32:17 -0700, Joerg wrote:

Tim Wescott wrote:
On Thu, 18 Jul 2013 10:52:02 -0700, Joerg wrote:

Tim Wescott wrote:

[...]


Hey! How about this:

Make a state-space oscillator with two multiplying DACs in it; one
for frequency, and one for damping. Then use a micro to set the
DACs. It should be great fun, and the load on the micro will be
light.

It might even take up no more space than the NE 612 solution...


Not sure about that. Doing it in time domain would require a LUT being
pumped into the DAC at a fairly fast clip. But who knows, maybe there
is a DAC chip that has much of this in there already?

I'm not talking about having the audio frequency stuff come out the
micro -- I'm talking about having an all-analog oscillator that happens
to be controlled by multiplying DACs in the signal chain:

.---> integrator ---> mpy DAC 1 ---+---> integrator ----o----
| A |
| '----- mpy DAC 2 ----o |
|
'-------------------------------------------------------'

Multiply DAC 1 sets the frequency, ...


But how does that produce a clean sine wave where the frequency can be
changed electronically (analog)?


... multiply DAC 2 sets the damping (which
is nominally 0, but which you'll need to nudge around for AGC. Or just
use a two-diode amplitude stabilization, why didn't I think that
earlier?)

OK, how about this:

.---> integrator ---> mpy DAC ---+---> integrator ----o----> |
A |
| '------- AGC --------o |
|
'-----------------------------------------------------'


It doesn't really need AGC, the amplitude can be set via resistors.
Diodes are out anyhow because that would result in serious sine
distortion.

[...]

It doesn't produce a clean sine wave where the frequency can be changed
electronically. It produces a clean sine wave where the frequency can be
changed leisurely by a slow processor.

(I didn't say it was a _good_ solution, just that it's _a_ solution.)

I'm not sure how you build an oscillator without AGC of some sort; you
must be a better man than me.

--

Tim Wescott
Wescott Design Services
http://www.wescottdesign.com

 

[Joerg]

Tim Wescott wrote:

On Thu, 18 Jul 2013 13:32:17 -0700, Joerg wrote:

Tim Wescott wrote:
On Thu, 18 Jul 2013 10:52:02 -0700, Joerg wrote:

Tim Wescott wrote:
[...]


Hey! How about this:

Make a state-space oscillator with two multiplying DACs in it; one
for frequency, and one for damping. Then use a micro to set the
DACs. It should be great fun, and the load on the micro will be
light.

It might even take up no more space than the NE 612 solution...


Not sure about that. Doing it in time domain would require a LUT being
pumped into the DAC at a fairly fast clip. But who knows, maybe there
is a DAC chip that has much of this in there already?
I'm not talking about having the audio frequency stuff come out the
micro -- I'm talking about having an all-analog oscillator that happens
to be controlled by multiplying DACs in the signal chain:

.---> integrator ---> mpy DAC 1 ---+---> integrator ----o----
| A |
| '----- mpy DAC 2 ----o |
|
'-------------------------------------------------------'

Multiply DAC 1 sets the frequency, ...

But how does that produce a clean sine wave where the frequency can be
changed electronically (analog)?


... multiply DAC 2 sets the damping (which
is nominally 0, but which you'll need to nudge around for AGC. Or just
use a two-diode amplitude stabilization, why didn't I think that
earlier?)

OK, how about this:

.---> integrator ---> mpy DAC ---+---> integrator ----o----> |
A |
| '------- AGC --------o |
|
'-----------------------------------------------------'


It doesn't really need AGC, the amplitude can be set via resistors.
Diodes are out anyhow because that would result in serious sine
distortion.

[...]

It doesn't produce a clean sine wave where the frequency can be changed
electronically. It produces a clean sine wave where the frequency can be
changed leisurely by a slow processor.

(I didn't say it was a _good_ solution, just that it's _a_ solution.)

Ok, but if I need a uC I might as well plop down a DDS chip and let it
leisurely program that in a loop. Even a brand-name AD9837 can be had
for around two Dollars.

I'm not sure how you build an oscillator without AGC of some sort; you
must be a better man than me.

I am certainly not a better man. I grew up with RF and most of my
oscillators were of the LC kind. It's been too long ago and I think the
last oscillator with AGC I built was at my alma mater. Back in
nineteen-sumpthin'. We had to prevent it from railing because the rails
were considered "unclean" and they wanted to avoid anything being
modulated in.

--
Regards, Joerg

http://www.analogconsultants.com/

 

[josephkk]

On Thu, 18 Jul 2013 06:52:24 -0700, Joerg wrote:

josephkk wrote:
On Tue, 16 Jul 2013 09:19:38 -0700, Joerg wrote:


Plus an opamp for the PID. Can't do it with XOR alone because that
results in a frequency-dependent phase error.

It's a pity that all the sinewave oscillators such as XR2206 and
ICL8038 have been obsoleted. Those could easily be FM-modulated,
something that is a real hassle with DDS chips.

Jeorg,
How about a varactor tuned Wein bridge oscillator an FTDI chip, a micro
(PIC, AVR. etc.,), mostly to handle the FTDI chip, a couple onchip
comparators, then using a counter in the uC count clocks after the
first comparator detects a "zero crossing" of the reference, to the
time the second comparator detect the locked signal zero crossing.
With a touch of logic (possibly external to the uC) this will allow
producing the opportunity of having correction pulses to integrate
every half cycle. It would allow fast phase adjustment and stable lock,
the phase resolution would be determined by the counter clock rate.


The problem with varactor diodes is that pretty much all high
capacitance ones have gone lalaland. Probably because there are no
radios with discrete oscillators and filters anymore.

You can do an audio Wein bridge with a few hundred pF. I would be
surprised if some in that range aren't still available. Plus you can
always parallel a handful.

?-)

 

[Joerg]

josephkk wrote:

On Thu, 18 Jul 2013 06:52:24 -0700, Joerg wrote:

josephkk wrote:
On Tue, 16 Jul 2013 09:19:38 -0700, Joerg wrote:


Plus an opamp for the PID. Can't do it with XOR alone because that
results in a frequency-dependent phase error.

It's a pity that all the sinewave oscillators such as XR2206 and
ICL8038 have been obsoleted. Those could easily be FM-modulated,
something that is a real hassle with DDS chips.
Jeorg,
How about a varactor tuned Wein bridge oscillator an FTDI chip, a micro
(PIC, AVR. etc.,), mostly to handle the FTDI chip, a couple onchip
comparators, then using a counter in the uC count clocks after the
first comparator detects a "zero crossing" of the reference, to the
time the second comparator detect the locked signal zero crossing.
With a touch of logic (possibly external to the uC) this will allow
producing the opportunity of having correction pulses to integrate
every half cycle. It would allow fast phase adjustment and stable lock,
the phase resolution would be determined by the counter clock rate.


The problem with varactor diodes is that pretty much all high
capacitance ones have gone lalaland. Probably because there are no
radios with discrete oscillators and filters anymore.

You can do an audio Wein bridge with a few hundred pF. I would be
surprised if some in that range aren't still available. Plus you can
always parallel a handful.

The BB201 is nowadays the highest one that is reasonably available in
the marketplace. Realistically you can use it up to around 25pF, maybe
30pF. After that the excitation by the oscillator will cause painful
nonlinearities.

So yeah, you can parallel. But rather than a handful it'll be a bucket full.

--
Regards, Joerg

http://www.analogconsultants.com/

 

[Skybuck Flying]

You are not alone.

My DreamPC for 2006 and fixed throughout the years also cannot handle the
heat.

Not even with an Antec 1200 case, somewhat cleaned.

At 27 celcius degrees, the CPU gets so hot that the motherboard's bios shuts
down the PC.

The temperature shutdown seems to be at 50 according to motherboard
settings.

So there I will be... playing Company of Heroes and all of a sudden...
booom... it shuts off.

Well at least this will prevent frying damage or so... so I kinda like it as
long as it doesnt happen well I am busy with something important

So far it has not happened with anything important just gaming.

The solution for me for now is to keep the doors and windows open and allow
some cool breeze to come in... this will drop the temperature down to 26
degrees celcius.

So my computer crashing or not crashing depands on 1 or 2 degrees.

Apperently the AMD X2 3800+ CPU is rated at about 85 watts or so...
apperently that's way too hot.

I am not happy with how CPU's are marketted today...

They all have the same name and same model number... sometimes there will be
a letter behind the cpu's model number for example for latest intel haswell
processor a T.

Apperently the T versions run at reduced clock rates, which makes them
consume less energy... instead of 85 watts it will be 65 watts or 45 or 35
watts or something.

So I was thinking... maybe it's time to ditch the AMD x2+ 3800+ crap cpu...
and switch to something else...

But this could be an expensive joke:

Probably new power supply needed, new motherboard, new memory... maybe even
new graphics card or maybe not.

What's further annoying is the cheap shit that's between the wafer and the
cpu heatspread apperently this could be replaced and make it drop some
degrees.

Not sure what happens if my finger would touch a waver if that would be the
end of it. Does seem interesting but at 35 watts or 45 watts doing that
might not be necessary.

For now I will see how it goes however... there are very hot days ahead...
so keeping the doors open might not be possible.

Right now I am thinking... maybe there still is a socket 939 processor
somewhere.... with much lower heat... that could be nice... but then me
would be a little bit worried about the performance Maybe even a single
core.

Bye,
Skybuck.

 

On Saturday, July 20, 2013 11:22:35 PM UTC-4, Skybuck Flying wrote:

You are not alone.



My DreamPC for 2006 and fixed throughout the years also cannot handle the

heat.



Not even with an Antec 1200 case, somewhat cleaned.



At 27 celcius degrees, the CPU gets so hot that the motherboard's bios shuts

down the PC.



The temperature shutdown seems to be at 50 according to motherboard

settings.



So there I will be... playing Company of Heroes and all of a sudden...

booom... it shuts off.



Well at least this will prevent frying damage or so... so I kinda like it as

long as it doesnt happen well I am busy with something important



So far it has not happened with anything important just gaming.



The solution for me for now is to keep the doors and windows open and allow

some cool breeze to come in... this will drop the temperature down to 26

degrees celcius.



So my computer crashing or not crashing depands on 1 or 2 degrees.



Apperently the AMD X2 3800+ CPU is rated at about 85 watts or so...

apperently that's way too hot.



I am not happy with how CPU's are marketted today...



They all have the same name and same model number... sometimes there will be

a letter behind the cpu's model number for example for latest intel haswell

processor a T.



Apperently the T versions run at reduced clock rates, which makes them

consume less energy... instead of 85 watts it will be 65 watts or 45 or 35

watts or something.



So I was thinking... maybe it's time to ditch the AMD x2+ 3800+ crap cpu...

and switch to something else...



But this could be an expensive joke:



Probably new power supply needed, new motherboard, new memory... maybe even

new graphics card or maybe not.



What's further annoying is the cheap shit that's between the wafer and the

cpu heatspread apperently this could be replaced and make it drop some

degrees.



Not sure what happens if my finger would touch a waver if that would be the

end of it. Does seem interesting but at 35 watts or 45 watts doing that

might not be necessary.



For now I will see how it goes however... there are very hot days ahead...

so keeping the doors open might not be possible.



Right now I am thinking... maybe there still is a socket 939 processor

somewhere.... with much lower heat... that could be nice... but then me

would be a little bit worried about the performance Maybe even a single

core.



Bye,

Skybuck.

Hello,
Where are you geographically located. If in Canada/US/
Western Europe, you would be sitting in a room with the air-conditioning switched on. If need be, remove one of
covers.
If you are in the Third World, you could buy small devices
which are effectively small airconditioning units for the
processor. They work. Or one could remove the covers and
place a small table fan beside the box. Switch on the fan
at the highest speed rating. Should work. Hope that helps.

 

[Sylvia Else]

On 21/07/2013 1:22 PM, Skybuck Flying wrote:

You are not alone.

My DreamPC for 2006 and fixed throughout the years also cannot handle
the heat.

Not even with an Antec 1200 case, somewhat cleaned.

At 27 celcius degrees, the CPU gets so hot that the motherboard's bios
shuts down the PC.

Presumably you've checked that the CPU fan (assuming there is one) is
running.

I had a problem of an overheating CPU some years back that I eventually
traced to inadequate thermal contact between the heatsink and the CPU.
Reapplying some heatsink compound solved the problem.

Sylvia.

 

[ÜBERŽ BAR]

On 07/20/2013 08:22 PM, Skybuck Flying wrote:

My DreamPC for 2006 and fixed throughout the years also cannot
handle the heat.

Not even with an Antec 1200 case, somewhat cleaned.

At 27 celcius degrees, the CPU gets so hot that the motherboard's
bios shuts down the PC.

The temperature shutdown seems to be at 50 according to motherboard
settings.

Apperently the AMD X2 3800+ CPU is rated at about 85 watts or so...
apperently that's way too hot.

Try lowering the CPU core voltage, if the BIOS allows it, a little bit
at a time. When it becomes unstable, go back up a notch.
I settled on 1.425 volts for my AMD XP-Mobile processor installed in a
desktop pc.

Do the same with the memory voltage setting.

 

[Jeff Liebermann]

On Sun, 21 Jul 2013 05:22:35 +0200, "Skybuck Flying"
<Windows7IsOK@DreamPC2006.com> wrote:

At 27 celcius degrees, the CPU gets so hot that the motherboard's bios shuts
down the PC.

With a thermistor or thermocouple probe,
<http://www.ebay.com/itm/220870280391>
measure the CPU case temperature, the heat sink temperature near the
CPU, the heat sink temperature near the air flow, the air temp near
the CPU fan, and the ambient air temperature. Calculate or measure
how many watts your CPU is burning. Lookup the die to case thermal
resistance of the CPU on the CPU data sheet. With the aforementioned
information, you can calculate the thermal resistance of the various
components of your system. The numbers will tell you which component
is the problem.

If you're feeding hot air into the CPU fan, the CPU will get that much
hotter. If you slop too much silicon grease between the CPU and the
heat sink, you will have a dramatic temperature difference between the
CPU and the base of the heat sink. That's the usual problem. If
you're overclocking the CPU, you take your chances.

Then there are problems with fans. The usual problem is that all the
fans either blow air in circles or lack sufficient exhaust (or intake)
area to handle the rated air flow. Blowing air in a circle just heats
the air every time it blows by the CPU until it gets really hot.
Blowing air out of the case is useful only if there is a corresponding
air intake area that is at least 80% of the area of the exhaust ports
(due to differences in air density between hot air and cold air). I've
seen many build it yourself cases with insufficient air intake or
exhaust ports. You might try blowing smoke through the case to see
where the air flow is really going.

Then... there's liquid cooling.
<http://www.overclockers.com/watercooling-myths-exposed/ >

The temperature shutdown seems to be at 50 according to motherboard
settings.

Probably much too low. The shutdown temp depends on your unspecified
CPU type. Lookup the recommended thermal shutdown temperature for
your CPU and set the BIOS thermal shutdown threshold for 5-10C lower.
<http://www.hardwaresecrets.com/article/Maximum-CPU-Temperature/143/1>
If your CPU is not on the above list, find it in the manufacturers
data sheets.

--
Jeff Liebermann jeffl@cruzio.com
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558

 

[OldGuy]

Got a CPU fan?

Remove it!
Look inside the heatsink to see if it is clogged with dust.
Vacuum or blow out.

Reinstall fan.

Run cool.

My PC had exaclty this problems; would shut down from heat.
So I cleanned the dust beteen the heatsink fins and the problem was
solved ... until next time.

 

[ÜBERŽ BAR]

On 07/21/2013 08:47 AM, Jeff Liebermann wrote:

With a thermistor or thermocouple probe,
http://www.ebay.com/itm/220870280391
measure the CPU case temperature, the heat sink temperature near the
CPU, the heat sink temperature near the air flow, the air temp near
the CPU fan, and the ambient air temperature.

Hey! It's Skybuck. Is he really going to perform all that without doing
damage?

 

[Skybuck Flying]

I didn't bother re-appling the therman paste interface material as far as I
remember (just used the stuff that was on it... not believing the little
bubbles bs) or maybe I did...

I think I pulled of the whole thing for cleaning or so... and then put it
back on... or maybe not...

I don't think it's a thermal paste interface material probably because on
idle the temperature drops back to 32 degrees celcius or so... which to me
seems to indicate it's running as it would if it was applied fresh.

Bye,
Skybuck.

 

[Skybuck Flying]

Right now it's 27.5 degrees celcius 0.5 degrees down from 28 degrees
earlier, so it's not 2 degrees hotter than yesterday.

Tomorrow it will probably be 30 degrees celcius.

I am not sure what the 50 degree shutdown is... maybe it's cpu temperature
or maybe it's motherboard temperature.

I don't think it's too low, it's rather high, I used to run at 45 degree
celcius as the max.

Computers/human beings are similar, at 43 degree celcius heat becomes
unbarreble for me.. still some beach go-ers like it.

At 50 degrees celcius people definetly start to die and so will computers.
So it's already too high I think...

Fact of the matter is, air cooling is simply not providing enough cooling
capabilities.

Even if all fans set at max there is only so much it can do.

I think liquid cooling will probably fail as well... the radiator would have
to be better than 8 fans all together ???

So far one solution mentioned is getting air conditioning... seems kinda
strange idea to me but ok.

I could try and build it into my appartment, draw back is if I move it might
be lost... or it could be moved not sure...

It will probably require extra power... there is a wall socket near the door
where it could be build above the door...
might look into this possibility.

Not sure if it will help much...

It better not require too much wattage... not sure if my appartment can
deliver enough power for all of these devices

The motherboard is a winfast... the shutdown future is kinda cool... wish my
other motherboards had it... that could have prevented lots of motherboard
deaths.

CPU-Z shows: motherboard model: NF-CK804

Bios: Phoenix Technologies, LTD
Version: 6.00 PG
Date: 08/11/2005

This future is not on the top of my list for a next/new motherboard

Bye,
Skybuck.

 

[Skybuck Flying]

I already did that mostly...

Used vacuum cleaner to suck away dust... I know it's a bit dangerous but ok.

And blew the dust out...

It's probably 95% clean or so... should be enough.

Bye,
Skybuck.

 

[Skybuck Flying]

I am also quite annoyed with AMD and their X2 processor.

The multiplier is locked as some of you know... so properly underclocking is
not possible.

The motherboard had two nice features:

CPU Clock Multiplier or something like that.

and

HT Multiplier.... (hyper transport)

First I tried HT... later I figured it was the wrong setting.

I didnt notice any performance degradation with HT running at 1x instead of
auto/5x ?

Maybe HT is for core to core communication... but I think it's main roll was
memory speed/bandwidth.

Didnt notice a thing... quite odd.

The HT multiplier was unlocked according to CPU-Z

Unfortunately the CPU multiplier not setting it to 5x or 4.5x or
something instead of 10x had no effect

I am not going to mess with voltages cause I dont know how to do that
properly... and certainly don't want to risk damage

Just gonna wait for the night too cool down before I continue my gaming

Or maybe I do a low power game

Bye,
Skybuck.