I remember those from school and calculating the velocity of the beam -- good stuff

@tuopeeks

5 жыл бұрын

Thanks, yeah, unfortunately few schools have or use these now.

Thank you sir

Nice explained

Nice video!

Nice

Sir, what did you use for a DC power supply for the plats, anode, cathode? Thank you.

@tuopeeks

4 жыл бұрын

In this instance I am using a small unit (HVC-3MC60) taken from an old laser printer that provides the 6kV for the corona wires. It runs from 24V DC and has an output around 0.5mA. Unfortunately, laser printers today incorporate these supplies on board and are not so available. Similar supplies are around but may need modification.

thanks for sharing the information. Pls share link for purchasing the CRT tube and the ignition circuit.

@tuopeeks

3 жыл бұрын

These tube appear on eBay from time to time sometimes old original types but also new educational ones. Various power supplies can be used either salvaged from old equipment or modules bought from eBay or the likes. The Power supply needs to be around 4kv but at microamps.

What brand(s) of tubes are you using here and where did you purchase the last one ?

@tuopeeks

3 жыл бұрын

Can't remember now, the first is an old tube and the second is a new reproduction tube found on eBay a few years ago. I think they were made for educational supplies.

@monkeyclapping1372

3 жыл бұрын

@@tuopeeks Appreciate the reply! I'll keep an eye on eBay for similar. Have you by any chance measures x-rays (if any) emanating from this device? I've read that under 1 KeV, there isn't much x-ray emission but higher voltages across the anode/cathode corresponds to increasingly higher x-ray emission...

@tuopeeks

3 жыл бұрын

@@monkeyclapping1372 X-ray emission is unlikely with a anode voltage under 10kV. At this voltage glass is opaque similar to UV. Most modern replica tubes have some gas pressure and they will operate at voltages under 10kV. Older tubes may have harder vacuums and require higher voltages to start working. If you have to apply voltages of greater than 15kV to operate the tube then it is likely some x-rays are being generated.

2:00 - Holy shit, thats freaking cool. Its like an electron beam from a CTR monitor... Do you actually see the electrons sparking or is it just the fluorescence that is illuminating due to the electrons? Because of the slit, can you practically perform the "double split experiment"? 3:11 - How is the electrons moving in a straight line when the there is no electrode from the opposite side of the electron beam unit? What is attracting the electrons to go in a straight line near the number "0" section? This is an excellent explanation, I always wanted to see how these cathode ray tubes work in reality rather than paper.

@tuopeeks

2 жыл бұрын

Late reply, sorry. The beam travels in a straight line after the gun as they have been accelerated through the gun and continue in a straight-ish line depending on focus. This is the same as in early and oscilloscope cathode ray tube. With regards to the earlier tubes there is still a small amount of air inside and the interactions between air molecules and the electrons create a glow discharge which can be seen in these tubes. Regarding 'double slit' this demonstration isn't showing any interference patterns but interestingly electron interference can be demonstrated with a electron diffraction CRT ( I have one on my channel) . To achieve this the slit has to be in the atomic scale and graphite atoms are used to from the grating.

At minute 2:00, what type of supply voltage does the cathode ray tube receive at the four connections it has?

@tuopeeks

Жыл бұрын

In all instances in the video the anode to cathode potential is slightly under 5kV

@raulmg1264

Жыл бұрын

​@@tuopeeks Can you share the model of the power supply you use, in order to be able to buy it, please.

@tuopeeks

Жыл бұрын

@@raulmg1264 Might be hard to find. I salvaged the module from old 1980s laser printer. They were used for corona wire supplies. They tend to be integrated these days so hard to isolate from the rest of the printer's electronics. The modules were made by TDK, part# TXDB66202T. Input voltage was 24V output around 5kv at 0.5mA. Might be easier to build something up or use a low voltage CFL driver but that would need to have a high voltage diode added to the output.

Thz

What about William Crooks dark space ?

@tuopeeks

3 жыл бұрын

Not demonstrated in cathode ray tubes. Dark space relates to gas discharges in low pressures. These cathode ray tubes have higher vacuums where no gas discharge is visible.

This inner plate is made up of??

@tuopeeks

3 жыл бұрын

The first tube's back plate looks like it is made of aluminium and has a fluorescent coating on it. This plate is connected as the anode. The second educational tube has a conventional electron gun with a hot cathode and anode assembly. The beam passes over a slightly angled plate of fluorescent coated glass with the graticule printed on it much like an oscilloscope screen but parallel to the beam. This glass plate is physically held in place by groves in the metal deflection plates.

hi, how much is the power of inverter?

@tuopeeks

2 жыл бұрын

The inverter used to create the beam splitting is probably capable of about 30W but used here to create the plate voltage so loading is negligible.

Plzz gooo