audio recording on IC -help wanted

[Boris Mohar]

On Sun, 22 Mar 2009 02:32:04 GMT, john <noone@nowhere.com> wrote:

I want to create a probe to out in between two AA or AAAA cells to
detrmine the current flowing.

The probe could be made up of double-sided circuit board with a
wire coming from the contact area on each side.

All I see in the catalogues is 1.6mm thick PCD. Where can I get a
bit of thinner board?

TIA.

Adhesive backed copper tape from stained glass store.



Regards,

Boris Mohar

Got Knock? - see:
Viatrack Printed Circuit Designs (among other things) http://www.viatrack.ca

void _-void-_ in the obvious place

 

[Richard Crowley]

"Lostgallifreyan" wrote ...

The advice here someone gave on using satellite feed cable is good, it's
very
well screened.

It is well shielded for its intended purpose (UHF-RF) and it terminates
well to RF connectors. But it is nothing special at audio frequencies,
and is worse than ordinary audio cable because of its size, stiffness,
and poor performance when you try to terminate it with typical audio
connectors.

 

[Lostgallifreyan]

"Richard Crowley" <rcrowley@xp7rt.net> wrote in
news:7356pqFt6iuaU1@mid.individual.net:

"Lostgallifreyan" wrote ...
The advice here someone gave on using satellite feed cable is good, it's
very
well screened.

It is well shielded for its intended purpose (UHF-RF) and it terminates
well to RF connectors. But it is nothing special at audio frequencies,
and is worse than ordinary audio cable because of its size, stiffness,
and poor performance when you try to terminate it with typical audio
connectors.

On the other hand, if you're wiring it in conduit to a stage box where the
termination is solder, and the chassis mounted connectors take the strain and
adapt to similar connectors in the open attached to durable audio cables, why
not? Theatres and clubs have often done it. The cheap foil-wrapped pairs that
run a single solid strand of tinned copper along the inside of the foil are
ideal for fixed multi-way audio runs. The thinnest paired mic cable of
similar ability woult take five to ten times the cross sectioan area. And
cost vastly more too.

And a foil sheath really doesn't care if the signal is RF or AF, it's a
total faraday cage, what more do you want? I grant that EM induction of
signals might be bothersome but it always is, that's why balanced lines
matter.

 

[Don]

On Fri 27-Mar-2009 23:31, Lostgallifreyan <no-one@nowhere.net>
wrote:

Don <no-not.avail@com.com> wrote in
news:Xns9BDBE3268DD505D4AM2@69.16.185.250:

Unfortunately, many web sites merrily say that almost any
wire will do for a short run of audio cable. I am not so
sure!


That will be an antidote to the audiophools that insist of
oxygen free silver or whatever it is they insist on now.

The advice here someone gave on using satellite feed cable is
good, it's very well screened. The other thing is to use star
network ground schemes for the audio, and to keep digital and
analog grounds separate if you can,

I dug out some CT100 satellite cable. It's lovelt stuff but it
is far too stiff for my purpose because it unfortunately creates
a real possibility of pulling out the plugs or altering their
angle of entry which might create a noisy intermittent contact.

and where possible, used
balanced audio signal lines. Major studios do this, as do many
home studios since the practise has been frequently described
in Sound On Sound and similar magazines. As they specialise in
handling mixed signals from a large range of gear, you can be
sure their methods are good. If you do this you'll likely not
need to worry if digital and audio cables run side by side,
though it's still wise to minimise that, don't tempt fate..

The general view (not necessarily the wisest view!) seems to be
that for lengths less than 15 foot there is no advantage to
using a balanced line. Here is what one such author states
about it in a bit of a lighter hearted way than the others.

<http://books.google.co.uk/books?id=Bl1XE-ki0WwC&pg=PA36
&dq=audio+interconnect+cable> See p39.

 

[Mr.T]

"Lostgallifreyan" <no-one@nowhere.net> wrote in message
news:Xns9BDBEF6256FA4zoodlewurdle@216.196.109.145...

That will be an antidote to the audiophools that insist of oxygen free
silver
or whatever it is they insist on now.

Yes, but I certainly found "acid free" copper cables were a good thing,
having replaced a few that had turned to green-black goo inside.

The advice here someone gave on using satellite feed cable is good, it's
very
well screened.

But not very flexible if used for temporary installation.

MrT.

 

[Salmon Egg]

I have seen this thread for a while without reading it. Because of it
longevity I will throw in my 2˘ without even knowing what has been
written in the past.

All the ferrite beads do is add lossy inductance to the common mode
propagation along the vague transmission line formed by all of the
conductors in parallel against free space and the surrounding
environment. It is the equivalent of winding the cable on a transformer
core. Ordinarily adding these beads will help primarily in two
situations.

1. The receiving device is sensitive to common mode signals.

2. There is regeneration or parasitic circuitry that could cause
oscillation to break out,

In the former, the inductance "chokes" the common mode. There are other
ways of handling the problem. For example, coupling the audio signal,
through an audio transformer to the receiving device will prevent the
common mode signal from being transmitted.

For the latter, the beads introduce loss and change other circuit
parameter. That may be enough to suppress oscillation.

If you can, understand what is going on rather than merely try anything.

Bill

--
Private Profit; Public Poop! Avoid collateral windfall!

 

[Don]

On Sun 29-Mar-2009 15:11, Baron
<baron.nospam@linuxmaniac.nospam.net> wrote:

Don wrote:

On Sat 28-Mar-2009 17:50, Salmon Egg
SalmonEgg@sbcglobal.net> wrote:

I have seen this thread for a while without reading it.
Because of it longevity I will throw in my 2˘ without even
knowing what has been written in the past.

All the ferrite beads do is add lossy inductance to the
common mode propagation along the vague transmission line
formed by all of the conductors in parallel against free
space and the surrounding environment. It is the equivalent
of winding the cable on a transformer core. Ordinarily
adding these beads will help primarily in two situations.

1. The receiving device is sensitive to common mode
signals.

2. There is regeneration or parasitic circuitry that could
cause oscillation to break out,

In the former, the inductance "chokes" the common mode.
There are other ways of handling the problem. For example,
coupling the audio signal, through an audio transformer to
the receiving device will prevent the common mode signal
from being transmitted.

For the latter, the beads introduce loss and change other
circuit parameter. That may be enough to suppress
oscillation.

If you can, understand what is going on rather than merely
try anything.

Bill


Hi Bill, thanks for the detailed info. You're right that I
was guessing about the idea of using a ferrite without really
knowing the theory!

I was making my assumption based on my observation that all
the USB leads which have come with my dictation machines or
MP3 players have a plastic "blob" on them.

I was told this blob is a ferrite and that it's purpose is to
prevent trouble from interference. I didn't get told if the
blob prevented "incoming" intereference affecting the signals
on its lead or, alternatively, if the "blob" limited
"outgoing" interference being generated by using the lead.
From what you say, I guess the idea of the blob containing
ferrite is incorrect.

Perhaps the blob does not contain a ferrite but something
else? So I dug around and got this interesting web page.
http://www.bitpim.org/help/

QUOTE> "This cable has a blob half way along the cable
that converts from USB to serial and then connects to
the serial interface in the phone. The chip inside the
cable is a Prolific 2303 and this is how your operating
system will report it. It is marked as for the LG VX1/10
but works fine on the VX4400. </QUOTE

There's a chip in their blob? WOW. Well I never use my blob
leads! I use just ordinary USB leads and there seems to be
no problem.

Admittedly in this case the lead carries *digital* signals
which go to the USB port. By contrast, I had been asking
about *analogue* audio on a shielded lead going into the
line-in socket of a PC (or perhaps going to some other
device).

(a) So what is really in the blobs in my leads? (EG on my
Olympus WS-331M) The above link talks about conversion to
serial but I don't think my blobs would need to do that.

(b) Whatever is in the blob, would one of those help reduce
interference on my intended longer leads because the leads
will run near equipment and will carry analogue audio
signals?

Yes the blob located near to one end of the lead is there to
stop radiated interference from the lead. Yes it is a ferrite
tube. Note "From" not to.

Thanks Baron. So my blobs represent situation #2 in Bill's posting:

"There is regeneration or parasitic circuitry that
could cause oscillation to break out"

"the beads introduce loss and change other circuit
parameter. That may be enough to suppress oscillation."

Seems the blobs probably attenuate the (digital) signal. I'm not
sure I want that based on the understanding that an attenuated
signal is more prone to interference. OTOH ISTR USB uses 5volts
which is a fairly high level.

Maybe this is not going to help me after all with my analogue
leads.

 

[Baron]

Don wrote:

On Sun 29-Mar-2009 15:11, Baron
baron.nospam@linuxmaniac.nospam.net> wrote:

Don wrote:

On Sat 28-Mar-2009 17:50, Salmon Egg
SalmonEgg@sbcglobal.net> wrote:

I have seen this thread for a while without reading it.
Because of it longevity I will throw in my 2˘ without even
knowing what has been written in the past.

All the ferrite beads do is add lossy inductance to the
common mode propagation along the vague transmission line
formed by all of the conductors in parallel against free
space and the surrounding environment. It is the equivalent
of winding the cable on a transformer core. Ordinarily
adding these beads will help primarily in two situations.

1. The receiving device is sensitive to common mode
signals.

2. There is regeneration or parasitic circuitry that could
cause oscillation to break out,

In the former, the inductance "chokes" the common mode.
There are other ways of handling the problem. For example,
coupling the audio signal, through an audio transformer to
the receiving device will prevent the common mode signal
from being transmitted.

For the latter, the beads introduce loss and change other
circuit parameter. That may be enough to suppress
oscillation.

If you can, understand what is going on rather than merely
try anything.

Bill


Hi Bill, thanks for the detailed info. You're right that I
was guessing about the idea of using a ferrite without really
knowing the theory!

I was making my assumption based on my observation that all
the USB leads which have come with my dictation machines or
MP3 players have a plastic "blob" on them.

I was told this blob is a ferrite and that it's purpose is to
prevent trouble from interference. I didn't get told if the
blob prevented "incoming" intereference affecting the signals
on its lead or, alternatively, if the "blob" limited
"outgoing" interference being generated by using the lead.
From what you say, I guess the idea of the blob containing
ferrite is incorrect.

Perhaps the blob does not contain a ferrite but something
else? So I dug around and got this interesting web page.
http://www.bitpim.org/help/

QUOTE> "This cable has a blob half way along the cable
that converts from USB to serial and then connects to
the serial interface in the phone. The chip inside the
cable is a Prolific 2303 and this is how your operating
system will report it. It is marked as for the LG VX1/10
but works fine on the VX4400. </QUOTE

There's a chip in their blob? WOW. Well I never use my blob
leads! I use just ordinary USB leads and there seems to be
no problem.

Admittedly in this case the lead carries *digital* signals
which go to the USB port. By contrast, I had been asking
about *analogue* audio on a shielded lead going into the
line-in socket of a PC (or perhaps going to some other
device).

(a) So what is really in the blobs in my leads? (EG on my
Olympus WS-331M) The above link talks about conversion to
serial but I don't think my blobs would need to do that.

(b) Whatever is in the blob, would one of those help reduce
interference on my intended longer leads because the leads
will run near equipment and will carry analogue audio
signals?

Yes the blob located near to one end of the lead is there to
stop radiated interference from the lead. Yes it is a ferrite
tube. Note "From" not to.


Thanks Baron. So my blobs represent situation #2 in Bill's posting:

"There is regeneration or parasitic circuitry that
could cause oscillation to break out"

"the beads introduce loss and change other circuit
parameter. That may be enough to suppress oscillation."

Seems the blobs probably attenuate the (digital) signal. I'm not
sure I want that based on the understanding that an attenuated
signal is more prone to interference. OTOH ISTR USB uses 5volts
which is a fairly high level.

Maybe this is not going to help me after all with my analogue
leads.

Er, not quite ! You commonly see them on leads coming from equipment
that uses HF energy, like switch mode PSU's, CRT monitors etc. They
are they to suppress any leakage of that HF energy via the connecting
cable.

If you look carefully most of these leads are of the Co-Axial variety
and the energy that is being suppressed is carried on the outside of
the screen. Signals flowing on the inside of the screen are
un-affected.

--
Best Regards:
Baron.

 

[Don]

On Sun 29-Mar-2009 16:19, Baron
<baron.nospam@linuxmaniac.nospam.net> wrote:

Don wrote:

On Sun 29-Mar-2009 15:11, Baron
baron.nospam@linuxmaniac.nospam.net> wrote:

Don wrote:

On Sat 28-Mar-2009 17:50, Salmon Egg
SalmonEgg@sbcglobal.net> wrote:

I have seen this thread for a while without reading it.
Because of it longevity I will throw in my 2˘ without even
knowing what has been written in the past.

All the ferrite beads do is add lossy inductance to the
common mode propagation along the vague transmission line
formed by all of the conductors in parallel against free
space and the surrounding environment. It is the
equivalent of winding the cable on a transformer core.
Ordinarily adding these beads will help primarily in two
situations.

1. The receiving device is sensitive to common mode
signals.

2. There is regeneration or parasitic circuitry that
could cause oscillation to break out,

In the former, the inductance "chokes" the common mode.
There are other ways of handling the problem. For example,
coupling the audio signal, through an audio transformer to
the receiving device will prevent the common mode signal
from being transmitted.

For the latter, the beads introduce loss and change other
circuit parameter. That may be enough to suppress
oscillation.

If you can, understand what is going on rather than merely
try anything.

Bill


Hi Bill, thanks for the detailed info. You're right that I
was guessing about the idea of using a ferrite without
really knowing the theory!

I was making my assumption based on my observation that all
the USB leads which have come with my dictation machines or
MP3 players have a plastic "blob" on them.

I was told this blob is a ferrite and that it's purpose is
to prevent trouble from interference. I didn't get told if
the blob prevented "incoming" intereference affecting the
signals on its lead or, alternatively, if the "blob"
limited "outgoing" interference being generated by using
the lead. From what you say, I guess the idea of the blob
containing ferrite is incorrect.

Perhaps the blob does not contain a ferrite but something
else? So I dug around and got this interesting web page.
http://www.bitpim.org/help/

QUOTE> "This cable has a blob half way along the cable
that converts from USB to serial and then connects to
the serial interface in the phone. The chip inside the
cable is a Prolific 2303 and this is how your operating
system will report it. It is marked as for the LG VX1/10
but works fine on the VX4400. </QUOTE

There's a chip in their blob? WOW. Well I never use my
blob leads! I use just ordinary USB leads and there seems
to be no problem.

Admittedly in this case the lead carries *digital* signals
which go to the USB port. By contrast, I had been asking
about *analogue* audio on a shielded lead going into the
line-in socket of a PC (or perhaps going to some other
device).

(a) So what is really in the blobs in my leads? (EG on my
Olympus WS-331M) The above link talks about conversion to
serial but I don't think my blobs would need to do that.

(b) Whatever is in the blob, would one of those help reduce
interference on my intended longer leads because the leads
will run near equipment and will carry analogue audio
signals?

Yes the blob located near to one end of the lead is there to
stop radiated interference from the lead. Yes it is a
ferrite tube. Note "From" not to.


Thanks Baron. So my blobs represent situation #2 in Bill's
posting:

"There is regeneration or parasitic circuitry that
could cause oscillation to break out"

"the beads introduce loss and change other circuit
parameter. That may be enough to suppress oscillation."

Seems the blobs probably attenuate the (digital) signal. I'm
not sure I want that based on the understanding that an
attenuated signal is more prone to interference. OTOH ISTR
USB uses 5volts which is a fairly high level.

Maybe this is not going to help me after all with my analogue
leads.

Er, not quite ! You commonly see them on leads coming from
equipment that uses HF energy, like switch mode PSU's, CRT
monitors etc. They are they to suppress any leakage of that
HF energy via the connecting cable.

If you look carefully most of these leads are of the Co-Axial
variety and the energy that is being suppressed is carried on
the outside of the screen. Signals flowing on the inside of
the screen are un-affected.

Hi Baron. I have had these "blobbed leads" supplied with:

(1) two MP3 players
(2) two (flash-based) dictation machines.
(3) a digital camera

If I've understood the info given in this thread correctly then
I can't see what these players could be sending up their USB
cable to require a ferrite ring. I believe a USB port under XP
polls at 125 MHz and can go up to 1000 MHz but why does an MP3
player need this ferrite and my externally attached hard drive
or printer not need it.

Is it just chance that my MP3 players & camera have had a
ferrite on their lead or do other MP3 players also come with a
ferrite on their supplied USB lead?

 

[Eeyore]

Don wrote:

Hi Baron. I have had these "blobbed leads" supplied with:

(1) two MP3 players
(2) two (flash-based) dictation machines.
(3) a digital camera

If I've understood the info given in this thread correctly then
I can't see what these players could be sending up their USB
cable to require a ferrite ring. I believe a USB port under XP
polls at 125 MHz and can go up to 1000 MHz but why does an MP3
player need this ferrite and my externally attached hard drive
or printer not need it.

Is it just chance that my MP3 players & camera have had a
ferrite on their lead or do other MP3 players also come with a
ferrite on their supplied USB lead?

No-one would use a ferrite if it wasn't needed ( it costs extra ). It's
often there as a 'quick fix' for equipment that initally failed EMI
certification. Some may fit one as a 'just in case' measure.

Graham

 

[Baron]

Eeyore wrote:

Don wrote:

Hi Baron. I have had these "blobbed leads" supplied with:

(1) two MP3 players
(2) two (flash-based) dictation machines.
(3) a digital camera

If I've understood the info given in this thread correctly then
I can't see what these players could be sending up their USB
cable to require a ferrite ring. I believe a USB port under XP
polls at 125 MHz and can go up to 1000 MHz but why does an MP3
player need this ferrite and my externally attached hard drive
or printer not need it.

Is it just chance that my MP3 players & camera have had a
ferrite on their lead or do other MP3 players also come with a
ferrite on their supplied USB lead?

No-one would use a ferrite if it wasn't needed ( it costs extra ).
It's often there as a 'quick fix' for equipment that initally failed
EMI certification. Some may fit one as a 'just in case' measure.

Graham

Graham is right ! If it wasn't needed it would be there.

However all the Items that have been mentioned have in them one or more
sources of high frequency energy that can and does leak out, usually
via a connecting cable.

--
Best Regards:
Baron.

 

[Lostgallifreyan]

Don <no-not.avail@com.com> wrote in news:9BDE3A90BFAA15D4AM2@69.16.185.247:

I believe a USB port under XP
polls at 125 MHz and can go up to 1000 MHz but why does an MP3
player need this ferrite and my externally attached hard drive
or printer not need it.

As others said, improper shielding and suppression, but also, bear in mind
that a low clock rate can still cause a lot of RF interference if the edge
transitions are fast enough. Some components might have very fast rise/fall
times, even in equipment where it's not required, if it turned out cheaper
that way for whatever reason. It's usually cheaper to overspecify for bulk
buying if the economy is good, than it is to agonise for a long time to
select parts exactly, as the weakest link in the chain is what needs
consideration most. So if a design works right, but some parts work at higher
speeds than others, they won't cause failure, but might cause more switching
noise. Despite the cost of a ferrite slug, it might be seen as the cheap way
out.

 

[Franc Zabkar]

On Thu, 07 May 2009 15:04:59 -0500, Lostgallifreyan
<no-one@nowhere.net> put finger to keyboard and composed:

Hello, does anyone know what the innards are for the remote OSD controller
for ELO touchscreen LCD monitors?

There are four buttons on the case, and a PS2 connector on the cable, and I
have only the monitor. I haven't needed to adjust it, but I still want to try
it. I'm guessing it might be just a common ground and a wire to each of four
buttons, but if anyone knows what's really in there, please post a
description.

I can't help with the pinout, but you should be able to discover
something about the 6-pin (?) DIN port by measuring the voltages.

One pin will most likely be connected to ground. If the other pins are
connected to switches, then they will most probably have pullup
resistors connecting to +5V or whatever supply is applicable.

Let's say the pullups are 4K7. With the monitor powered down, you will
probably measure 9K4 between any two switch inputs. If you measure
4K7, then one pin must be connected to the supply.

You can find the supply pin by loading each input with a resistor, say
1K. The supply pin's voltage will remain constant whereas the switch
pins will droop.

- Franc Zabkar
--
Please remove one 'i' from my address when replying by email.

 

[Lostgallifreyan]

Franc Zabkar <fzabkar@iinternode.on.net> wrote in
news:tf49059qdelpjfkahcer7iht4qmethpgto@4ax.com:

On Thu, 07 May 2009 15:04:59 -0500, Lostgallifreyan
no-one@nowhere.net> put finger to keyboard and composed:

Hello, does anyone know what the innards are for the remote OSD
controller for ELO touchscreen LCD monitors?

There are four buttons on the case, and a PS2 connector on the cable,
and I have only the monitor. I haven't needed to adjust it, but I still
want to try it. I'm guessing it might be just a common ground and a wire
to each of four buttons, but if anyone knows what's really in there,
please post a description.

I can't help with the pinout, but you should be able to discover
something about the 6-pin (?) DIN port by measuring the voltages.

One pin will most likely be connected to ground. If the other pins are
connected to switches, then they will most probably have pullup
resistors connecting to +5V or whatever supply is applicable.

Let's say the pullups are 4K7. With the monitor powered down, you will
probably measure 9K4 between any two switch inputs. If you measure
4K7, then one pin must be connected to the supply.

You can find the supply pin by loading each input with a resistor, say
1K. The supply pin's voltage will remain constant whereas the switch
pins will droop.

- Franc Zabkar

Worked. Thanks. At least, I'd already thought of trying probing between
pins via a 1K resistor but wanted to put it off till I'd tried to find direct
info. The unpowered test across pins found very high values so a powered test
works best. I got some responses that show it's not got any complex logic in
the remote unit, just buttons. It needs all 6 wires though, my test used an
old mouse cable and plug, so I won't have it all till I build one that wires
a pin I had no access to. I also found it's safe to connect ground/screen to
any of the other wires, it gets appropriate responses, so it's only needed to
figure out which is which. Though as far as I can tell, a fifth unlabelled
function is provided which might duplicate the chassis-mounted power button
beside the mini-DIN socket.

One firm wants $58 for the remote unit! Anyone with an ELO touchscreen
monitor minus OSD controller from eBay or elsewhere will find my clumsy post
more rewarding than spending their money that way...

 

[Tilmann Reh]

Eeyore schrieb:

These are zero-voltage crossing opto-coupled triac drivers I hope to use
for my application where a studio is experiencing random mains clicks by
building them into a PCB that will ensure zero-voltage / current turn on
/ off of certain loads.

They seem to be readily available but I have only found Fairchild as a
major manufacturer. I'm a bit touchy about using single sourced parts.
Despite the MOC prefix, On Semi don't seem to have them.

Does anyone know of suitable alternate / alternative parts ?

They are pretty common.

Toshiba also builds them, named TLP30xx.

At Vishay, their name is VO30xx.

The former Motorola parts went to Global Optoelectronics, then to QT,
and finally to Fairchild - not to On Semi, so you can't find them there.

There even are clones like those of optoinc.com.

I think you don't need to worry about availability of these parts.

Tilmann

 

[Eeyore]

Tilmann Reh wrote:

Eeyore schrieb:

These are zero-voltage crossing opto-coupled triac drivers I hope to use
for my application where a studio is experiencing random mains clicks by
building them into a PCB that will ensure zero-voltage / current turn on
/ off of certain loads.

They seem to be readily available but I have only found Fairchild as a
major manufacturer. I'm a bit touchy about using single sourced parts.
Despite the MOC prefix, On Semi don't seem to have them.

Does anyone know of suitable alternate / alternative parts ?

They are pretty common.

Toshiba also builds them, named TLP30xx.

At Vishay, their name is VO30xx.

The former Motorola parts went to Global Optoelectronics, then to QT,
and finally to Fairchild - not to On Semi, so you can't find them there.

There even are clones like those of optoinc.com.

I think you don't need to worry about availability of these parts.

Thanks for the extra sources.

Graham


--
due to the hugely increased level of spam please make the obvious adjustment
to my email address

 

[Baron]

GregS wrote:

In article <8ofa25dkvmggo2p036mh40ukjk140amjm9@4ax.com>, John Fields
jfields@austininstruments.com> wrote:
On Tue, 02 Jun 2009 14:15:28 GMT, zekfrivo@zekfrivolous.com (GregS)
wrote:

In article <0001HW.C64995F5045EFF0DB01AD9AF@news.sf.sbcglobal.net>,
incognito@xbjcd.com wrote:
How do you tell if a fan is ball-bearing type or bushing type?

Says on the fan "Delta Electronics EFB5012HA, DC Brushless". It's a
2 inch, 12v fan.

Googling turns up nada.

Thanks,

Most bearing types will act as a spring when you push in on
the impeller.

---
Even if that were true, which it isn't, how could that be used to
differentiate between ball bearings and sleeve bushings?

I'll repeat, most fans I have come across have a spring loaded
bearing. I don't trust that to tell motor specs, but
I am just saying fact.

greg

Actually I don't belive they do ! The magnetic field causes the rotor
to float.

--
Best Regards:
Baron.

 

[att2]

"Baron" <baron.nospam@linuxmaniac.nospam.net> wrote in message
news:h03tqd$nfj$1@news.eternal-september.org...

GregS wrote:

In article <8ofa25dkvmggo2p036mh40ukjk140amjm9@4ax.com>, John Fields
jfields@austininstruments.com> wrote:
On Tue, 02 Jun 2009 14:15:28 GMT, zekfrivo@zekfrivolous.com (GregS)
wrote:

In article <0001HW.C64995F5045EFF0DB01AD9AF@news.sf.sbcglobal.net>,
incognito@xbjcd.com wrote:
How do you tell if a fan is ball-bearing type or bushing type?

Says on the fan "Delta Electronics EFB5012HA, DC Brushless". It's a
2 inch, 12v fan.

Googling turns up nada.

Thanks,

Most bearing types will act as a spring when you push in on
the impeller.

---
Even if that were true, which it isn't, how could that be used to
differentiate between ball bearings and sleeve bushings?

I'll repeat, most fans I have come across have a spring loaded
bearing. I don't trust that to tell motor specs, but
I am just saying fact.

greg

Actually I don't belive they do ! The magnetic field causes the rotor
to float.

--
Best Regards:
Baron.
Most that I've seen say "ball bearing" right on the label if they are, since

it's a selling point.

 

[simon beauvary]

On Jun 4, 12:27 pm, John Fields <jfie...@austininstruments.com> wrote:
On Thu, 04 Jun 2009 12:51:28 +0100, Eeyore

rabbitsfriendsandrelati...@notcoldmail.com> wrote:

John Fields wrote:

Eeyore <rabbitsfriendsandrelati...@notcoldmail.com> wrote:

---
Only if the OP made a trypo, since the P/N on the data sheet is
EFB0512HA, not EFP5012HA.

I see what you mean. There's a missing zero after the EFB. I can't
imagine many manufacturers having part numbers that close that were quite
different though. I assume your introduction of the leter 'P' is also a
typo.

---
Yup.  Good catch...

JF  

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[Jonni Heikkilä]

Sähkö [Jukka Lukkari, 14.05.2008]

Sähkön kulutus jatkaa laskuaan
Sähkön kulutus jäi huhtikuussa runsaan prosentin edellisvuotta pienemmäksi.
Vuoden neljän ensimmäisen kuukauden aikana sähköä on Suomessa kulunut 32,3
gigawattituntia eli yli kaksi prosenttia viime vuotta vähemmän.

*Aika hurjaa pudotusta kun ennakoitiin viikko sitten teolisuuspiireissämme
mitä lie +10% lisää ja nyt tuo väittää jo -6% vuosilaskua!!! Kuka siis
valehtelee maasamme ydinhallinnon lisäksi?!