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What to do with an old CRT

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Maz

Sun May 28 2006, 02:52PM

Registered Member #111 Joined: Fri Feb 10 2006, 01:04AM
Location: Menasha,Wisconsin
Posts: 65

I currently have an old crt sitting in the middle of my bedroom, on the floor. i need to do something cool with it so i can justify getting rid of it (it still works). what shoild i do with it?

Tesladownunder

Sun May 28 2006, 04:30PM

Registered Member #10 Joined: Thu Feb 02 2006, 09:45AM
Location: Bunbury, Australia
Posts: 1424

1: Make a spinthariscope with the CRT phosphor. Also need a magnifying lens or eyepeice and the alpha emitter from an old smoke detector.

2 Make a vacuum chamber as in Jochens vacuum page.

3 Make a lifter supply (if you have the whole monitor with functioning HV).

4 Strip it of useful parts like the flyback, capacitors, mains cord, speaker or whatever but release the vacuum first by breaking off the pointed tip first under a cloth.

Peter

Hazmatt_(The Underdog)

Sun May 28 2006, 06:00PM

Registered Member #135 Joined: Sat Feb 11 2006, 12:06AM
Location: Anywhere is fine
Posts: 1735

Because you want to use the tube:

1. Make a cool CRT clock like the ones made from Oscilliscope tubes

2. Make an oscilliscope

3. HEHE Make Pong

4. Make a cool Lissajou demonstration for kids to teach them about frequency division, harmonics, and all the cool old information that is now lost or burried.

I would love to do this with 2 lasers and make a laser light Lissajou show for the science center on campus. We would also incorporate sound as a fundamental of a concert A so the kids can hear how frequency, sound, and light all relate to one another. I think its a real hard-core demonstration of principles and understandable at the same time.

Maz

Sun May 28 2006, 10:33PM

Registered Member #111 Joined: Fri Feb 10 2006, 01:04AM
Location: Menasha,Wisconsin
Posts: 65

now how would i be able to make an oscilloscope?

Hazmatt_(The Underdog)

Mon May 29 2006, 08:45AM

Registered Member #135 Joined: Sat Feb 11 2006, 12:06AM
Location: Anywhere is fine
Posts: 1735

how is a different thread

Bored Chemist

Mon May 29 2006, 08:47AM

Registered Member #193 Joined: Fri Feb 17 2006, 07:04AM
Location: sheffield
Posts: 1022

"Make Pong"
I thought that was chemistry.

A 'scope would be quite tricky because these things are designed for magnetic deflection. The frequency response would probably be rather limited.

Alfons

Mon May 29 2006, 03:06PM

Registered Member #134 Joined: Fri Feb 10 2006, 10:44PM
Location: Belgium
Posts: 86

Maz wrote ...

now how would i be able to make an oscilloscope?

Watch

and

for instructions how to turn a television in a scope... maybe you'll find some inspiration there

Tesladownunder

Mon May 29 2006, 03:47PM

Registered Member #10 Joined: Thu Feb 02 2006, 09:45AM
Location: Bunbury, Australia
Posts: 1424

At least I have done 3 out of 4 of my suggestions. Who has made an oscilloscope, PONG or a Clock (without using the CRT as a simple computer monitor)? Hands up please

I may need to use the electron gun out of one as my electron gun out of my x-ray tube may be too big for the standard glassware.

Peter

Philcogrump

Tue May 30 2006, 02:42AM

Registered Member #212 Joined: Sun Feb 19 2006, 05:42PM
Location: Texas
Posts: 20

I raise my hand for all three...

Bored Chemist wrote ...

A 'scope would be quite tricky because these things are designed for magnetic deflection. The frequency response would probably be rather limited.

No, actually, I think you have it in reverse. Almost all oscilloscopes use electrostatic deflection, not magnetic deflection. Electrostatic deflection has much faster response than magnetic deflection, which is why it is used for many oscilloscopes and at higher frequencies. Magnetic deflection has its limitations at certain frequencies. I built a simple scope using a 2AP1 CRT and three tubes. I also even have a commercial scope from the 40s that only had the CRT and one tube. These things are EASY to build methinks.

What kind of CRT do you have, Maz?

...

Tue May 30 2006, 03:48AM

Registered Member #56 Joined: Thu Feb 09 2006, 05:02AM
Location: Southern Califorina, USA
Posts: 2445

Umm, I believe you misread the post...

the tube from his computer monitor (implied in the first post) uses magnetic deflection, which makes it poorly suited as a scope.

I would just strip it for parts, or combine it with an old junker computer and give it to a relative for their b-day, or if you are lucky you can donate it to the salvation army or local thrift store, then write it off on your taxes for like $50, then get 2/3 of it back

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