CRT ?

[Scott Penrose]

Is there any value in a CRT any more?

I realised today when I picked up my 21" top of the line, completely flat, NEC VGA CRT that this may indeed be the case - it is heavy and in my way.

Two questions then:

* Does anyone have a use for a 21" top of the line CRT?
* Are anyone keeping CRT any more?

Scooter

[dhemsley]

You could make a retro fishtank?

Dayle

[Rob Gannon]

You could do what most people do with their CRTs these days.... put it
out on the nature strip on hard rubbish day.

-----Original Message-----
From: connected-commu...@googlegroups.com
[mailto:connected-commu...@googlegroups.com] On Behalf Of Scott
Penrose
Sent: Tuesday, 12 February 2013 9:43 AM
To: connected-commu...@googlegroups.com
Subject: [CCHS] CRT ?

[Scott Penrose]

Feels like a crime... but yes that is where it is going to head I think.

Scott

[April Staines]

in 50 years time it could become a collectors item... :-)

-------------------------------------------------------------------

April Staines - Melbourne AU

[Robert Eales]

I have found this to be useful in the past...
http://recyclingnearyou.com.au/

search by type in the first column and you can select your local council to find something near.

Other suggestions may be quicker but only if they are near you...
http://www.greenpc.com.au/
http://www.greencollect.org/

Good luck!

Cheers
Rob

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[Richie Cyngler]

A lot of video artists/hackers are picking them up off the nature strips and hacking them for use in installations etc, for analogue video synthesis or whatever. Obviously you have to be very careful hacking high voltage CRTs.

Richie

www.glitchpop.com

[hannah commodore]

On 12/02/2013, at 11:03, Robert Eales <robeal...@gmail.com> wrote:

Other suggestions may be quicker but only if they are near you...
http://www.greenpc.com.au/

as I work for Infoxchange I should note that GreenPC does not accept CRTs, since we have to pay for them to be recycled

[Scott Penrose]

Thanks for those links. Looks like no one is really accepting CRT for reuse, but definitely for recycle. I have an old fridge, a deep freezer and a few other things too. Not wanted on free cycle - probably because of where we live. Rare that I have had to get rid of working things. I seem mostly to use things until completely dead or repair, repair repair

:-)

Scott

[Jonathan Oxer]

On Tue, Feb 12, 2013 at 11:27 AM, Scott Penrose <sco...@dd.com.au> wrote:
> Thanks for those links. Looks like no one is really accepting CRT for reuse, but definitely for recycle. I have an old fridge, a deep freezer

Ooh, this got my attention. I've had my eye open for a little while
for something containing a compressor, which could be a fridge,
freezer, or airconditioner. I want to make a vacuum chamber (I'm sure
nobody can guess why!) and a refrigerant compressor can be repurposed
as a vacuum pump.

If either of these don't find a home, would you mind if I check out
whether the compressor would be suitable?

Cheers

Jon

[Scott Penrose]

Hi Jon

You are very welcome to come see. Happy to come to me some time? (Panton Hill, 10 minutes from Eltham)

Scott

[Zac Faragher]

Hi Jon,

I'm working on something similar, though I'm using a compressor from a
portable air conditioner to make an air compressor. Haven't really
made much progress, so don't really ask me for any advice :P

Zac F

[Christopher Pendlebury]

I found I couldn't even give them away on Freecycle. :-/ which means their current monetary value is slightly negative. I suggest you harvest parts.

Sent from my iPhone

[AnonymousChen]

The cool thing with CRT's is their high resolution and refresh rate much better than the LCD's and LED's :D

-Richard

[Tim Krins]

> The cool thing with CRT's is their high resolution and refresh rate much better than the LCD's and LED's

hehehhe

It's not 2005 anymore...

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int getRandomNumber() 
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[Clae]

What is it's lowest refresh rate?  I'm looking for something that goes down to 15kHz.

Also, where are you located?

Cheers,

Clae.

[Scott Penrose]

Hi Clae,

It is a NEC FP2141

This one - http://www.retrevo.com/s/NEC-FP2141SB-Monitors-review-manual/id/279bh932/t/1-2/

So actually a 24" not 21 - thought it looked big.

Specs

8ms

1920x1200 

And I am located in Panton Hill - 10 minutes from Eltham.

You can look up rest of specs online, but I couldn't easily find low refresh. 

BTW. 

Freezer = Going to try and give it to someone as is.

Fridge = Free for you to pull apart Jon

Scott

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[Jonathan Oxer]

On Fri, Feb 15, 2013 at 8:16 PM, Scott Penrose <sco...@dd.com.au> wrote:
> Freezer = Going to try and give it to someone as is.
> Fridge = Free for you to pull apart Jon

Thanks for your generosity Scott, but after seeing the previous emails
Luke Weston has offered to give me a fridge compressor that's already
extracted from a fridge and wired up for exactly the purpose I want.
We're not sure yet if it'll pull enough of a vacuum, but I'll check it
out and see how it goes. In the meantime if you find someone to take
your fridge, please do.

Cheers

Jon

[Clifford Heath]

Jon,

I've used a fridge compressor as a vacuum pump - for de-gassing PU resins.
Pretty effective. Supermarkets have nice jars with large stainless-steel lids that
are easy to solder a nipple into, which make good cheap vacuum chambers.

I also thought of using it for vacuum moulding, but you need something with
much high flow rate like a vacuum cleaner. Best of all would be to have a double
setup with both pumps, separated by one-way valves, so the vacuum cleaner
gives you the volume and the compressor a much higher vacuum for holding
detail.

I don't think I've guessed your purpose though?

Clifford Heath.

On 12/02/2013, at 11:53 AM, Jonathan Oxer <j...@oxer.com.au> wrote:

[David Lyon]

On Sat, Feb 16, 2013 at 10:04 AM, Jonathan Oxer <j...@oxer.com.au> wrote:

On Fri, Feb 15, 2013 at 8:16 PM, Scott Penrose <sco...@dd.com.au> wrote:
> Freezer = Going to try and give it to someone as is.
> Fridge = Free for you to pull apart Jon

Thanks for your generosity Scott, but after seeing the previous emails
Luke Weston has offered to give me a fridge compressor that's already
extracted from a fridge and wired up for exactly the purpose I want.
We're not sure yet if it'll pull enough of a vacuum,

Hi Jon,

There's this Industrial Vacuum pump I just found if that doesn't work:

 - http://www.ebay.com.au/itm/Used-industrial-Vacuum-pump-/261169777617

Just $20.

David

[Luke Weston]

The only thing I'm a little bit unsure about when it comes to the long-term reliability of a fridge compressor used in this way is the behavior of the compressor oil, since it's in contact with the water vapor and oxygen in the outside air and it's not in a completely closed system any more. I'm not sure if the compressor oil should be replaced after a certain amount of time (weeks? years? dunno) due to absorbtion of water vapor from the atmosphere and/or other interactions with atmospheric gases, since the oil is generally hygroscopic.

I've got a tin of polyolester refrigeration oil here which matches R134a amongst other things (it's a compressor originally used in a system loaded with R134a) we can use if we ever decide that changing the compressor oil is desirable in future... but it's a little bit of a pain in the bum to do, you've got to tip the compressor on its side and hold it up so the oil can be drained out of one of the lines, and then find something like a large syringe to patiently feed the oil back into the service port or suction port. And you need to know the right volume of oil to use for that compressor (sometimes it's written on the compressor, otherwise you've got to carefully measure the volume of the oil originally extracted) and use the right type of refrigeration oil which matches the original oil, which depends on what refrigerant was originally used in that compressor. Too much oil and the discharge port just spits out oil.

Also you need to plug the service port if you want to pull a vacuum on the suction port, since they're connected together internally.

Regards,
  Luke

[Clifford Heath]

On 16/02/2013, at 4:21 PM, Luke Weston <reindeer...@gmail.com> wrote:
> The only thing I'm a little bit unsure about when it comes to the long-term reliability of a fridge compressor used in this way is the behavior of the compressor oil

Fair point, but if your compressor craps out, well, it was probably going
to land-fill or recycling anyhow, and so was the replacement one you can
easily find.

A factor with fridge compressors is that they blow a little oil out the exit
pipe, which is normally caught in a trap and drains back - hence they're
really only suitable for intermittent operation. I've used mine for 30
minutes at a time, and at that rate, it's fine. I don't have a vacuum gauge
so I can't say how strong the suction is - quite enough for my purposes
though.

I have a long 6mm PVC pipe joining the entry and exit, and I remove it
from whichever end I need, depending on whether I want pressure or
vacuum. But the compressor itself stays sealed when not in use.

Will someone please tell me what Jon wants to use it for? I'm not psychic :)

Clifford Heath.

[Stuart Young]

Hi Clifford,

Jon wants it to test various bits of electronics (namely the ArduSat stuff) in a vacuum before the remote possibility of putting them into a space environment.

FWIW: Jon started putting up proto boards on Freetronics for the ArduSat platform - http://www.freetronics.com/collections/ardusat

For some details on ArduSat, the Kickstarter campaign is probably a good place to start: http://www.kickstarter.com/projects/575960623/ardusat-your-arduino-experiment-in-space

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[Jonathan Oxer]

Hey everyone, thanks for the suggestions!

As Stuart said, the plan is to set up a thermal vac chamber for a
couple of ArduSat related purposes. Firstly I need to outgas regular
FR4 PCB material before it goes into orbit: FR4 is notorious for
venting material when placed in a vacuum, which is bad when there are
optics in the satellite for 3 cameras and a spectrometer. If it's
cycled through a vacuum chamber before integration with the rest of
the satellite it'll outgas in the chamber, and then be fine when it
reaches orbit.

The second purpose is to try some thermal transfer experiments, and in
particular conduction through the flight PCBs. I don't have access to
a thermal imaging camera unfortunately but my general plan is to use
dry ice and direct contact through a metal mount to reduce the
temperature, and IR to raise the temperature of the board while it's
in the vac chamber. Then I can use an IR temperature sensor to see how
the board reacts, such as how quickly it can radiate out excess heat
once it's been raised to 85C or so and then the heat source removed.

Stuart's links are good for background, and there's also this talk I
did recently at LCA:

http://www.youtube.com/watch?v=HQ0wLmlRqpo

Cheers

Jon

[Luke Weston]

To be honest I think it's going to be impractical to do this sort of stuff realistically without a serious vacuum pump.

[Scott Penrose]

No worries. Thanks Jon

I will have to get you to visit one day though :-)

Scooter

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[thelionroars]

Computerbank (computerbank.org.au) no longer uses CRTs for their computers, but they will recycle them for a fee. It looks like $11 for 17" and under, $15 for larger sizes. The benefit of paying through them is that it gets recycled responsibly instead of being dumped as landfill. I would suggest calling before dropping round as they have limited space.

[Clifford Heath]

On 18/02/2013, at 9:50 AM, thelionroars <thelionr...@gmail.com> wrote:
> Computerbank (computerbank.org.au) no longer uses CRTs for their computers, but they will recycle them for a fee.

Booroondara Council offer a free compute recycling facility here: <http://goo.gl/maps/Z6v6j>.
It's not restricted to residents of Booroondara (when I sat used it a year ago).

Clifford Heath.

[David Lyon]

If you need to console yourself, don't worry about it too much.

The best thing about cleanup day is that your loved CRT might find
some friends to hang out with, get a suntan or a wash as the weather
will do.

It doesn't have to be a fully negative experience.

:-)