DIY simplest small CRT Oscilloscope
ฝัง
- เผยแพร่เมื่อ 29 ธ.ค. 2023
- In this video I will present to you the simplest possible way to make a Retro-style analog oscilloscope with a cathode ray tube (CRT). In previous years, this device has been described in several magazines and portals, but I could not find any pictures or a video presentation of its operation anywhere. So I decided to make it and present the results to you. let me say that this is not a serious instrument, but only a demonstration model to describe the way these instruments work. The device works with 12v power supply and is compact and practical to make thanks to the used DC-DC converter module.
SAFETY NOTE: Please do not attempt to recreate the experiments shown on this video unless you are familiar with High Voltage Safety Techniques! Direct Current even above 60V maybe lethal, even when the AC supply voltage has been disconnected due to the stored energy in the capacitors. I have no responsibility on any hazards caused by the circuit. Be very careful. This is a humble request.
0:06 Short Demo
3:00 Description
4:06 CRT Tube
4:36 Inside
6:45 Schematic
8:08 Demonstration
11:20 Building
Detailed instructions, pictures, and schematic at:
www.hackster.io/mircemk/diy-s...
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#electronics #oscilloscope #CRT #tube - วิทยาศาสตร์และเทคโนโลยี
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Beautiful work, Mirko. This was how electronic devices were made before the arrival of the digital age. Happy memories.
Happy to see a project like this being done without a microcontroller, there is an art being lost. My dad didnt use micros when he made christmas lights, or amplifiers, and I am sad to grow up in a time where people are throwing basic electronic competence away in favor of just hooking everything up to a microcontroller that barely runs some high end scripting language and then essentially it collapsing into a feat of doing that.
What a good idea using a boost converter instead of a large, expensive transformer. Great job, well done.
Молодец, красивый осциллограф 👍
You can even add a digital hz frequency and a volt meter display which are inexpensive
Nice work!
I recently (well, almost) finished a similar project around the D3-11GJ tube (32mm diameter, 600V anode voltage). I do not call mine a scope, because it lacks any sort of sawtooth deflection (not even this kind of neon bulb oscillator), as I know a proper horizontal circuit with triggering would be a giant task and not really worth it.
Instead, I call mine a "vector display", an ESP32 board supplies two channel XY signals to the deflection plates via an amplifier. The amplifier is needed, as the ESP's outputs are 0-3.3V, and the tube needs plus/minus 80V for full deflection. If you want to build something similar, I recommend to study the vertical amplifiers in old scopes.
I also rolled my own power supply - 12V to -600V, plus/minus 120V (for the amps), insulated 6.3VRMS (for heating) and 9V (stablized, for the MCU). It is based on the popular ZVS circuit, driving a custom would transformer. I can recommend this design for the simplicity, you only have to make sure the transformer has an air gap so the primary have a large enough leakage inductance for self-oscillation. You will need fast diodes too, but the circuit is super-simple, and the DC voltages are very stable without any feedback.
For the heating, I used 6.3VRMS square-ish wave from the transformer, but I don't recommend that soultion, as the distortion on the signal makes getting it right quite hard. If you want to heat the tube with AC type votlage, I recommend a separate square wave oscillator (maybe just a simple two-transistor astable), so the voltage is regulated via the peak value, and the main PSUs internal waveforms don't play a role.
For havin an amplifier, making the anode the ground potential, and setting the cathode to a negative high voltage worked well for me, as it greatly simplifies the design of the amplifier. This, on the other hand, made the PSU a bit more complicated, as I needed isolated heating voltage.
Looking forward to your scope-clock!
- HA7DN "Uncle Dino"
PS: I like your channel's logo.
Thanks for the suggestions, I plan to expand this project to Scope clock in the next period
A good deflection circuit can be easily made with only one pentode like an EF80 using the Miller-transitron circuit and could use the same HT source. It gives a very linear sweep having big sweep voltage.
You are impressive! A new project every week, amazing
Excellent.
Nice job on the enclosure too.
Nice job looks like something you can buy at the store. I like how you explained everything. I wish More people did that.
Oh wow that is very neat... great project. Thanks for the content!
Good work. Also inspiring. Thank you for your sharing.
Thats a beautiful thing. Nice work
Neon lamp as a sweep generator? Smart, i think this is simplest way to generate saw
You may replace R4 (10M) by a 4.7M resistor in series with a 10M pot (mounted on an insulating support along with a plastic shaft) to trim the sweep time. Also, add a multi-position switch with different values of capacitors for C3 (switch cold sides), or minimally, a simple toggle switch to add / remove a second 22nF capacitor in parallel with C3. In this case, switch the cold side of the second 22nF.
Also, C1 an C3 must be high voltage models.
Use an insulated (plastic) tool to trim R1 !!!
This project deals with 300 volts DC. Do not build it unless you are TOTALLY aware how to deal with high voltages.
Thanks
Nice design. Very neat and tidy construction on the board placement and CRT and cleverly designed enclosure as well.
Wow, great job, as always 👍🏼. I wish you a happy and successful new year and I‘m excited to see more of your cool projects in 2024.
Thanks, and Happy New Year
Very cool!
Awesome! 👍😀
Thank you very much!
It may not be a serious instrument, but it still looks very nice in that little box. 🙂
нормально получилось.Обратный ход развёртки малость напрягает-импульс от генератора подайте на катод трубки.Делал такой визуализатор на трубке 3ЛО1
Guau friend excelent
Great project, i have 5.5 inch crt tube with deflection coil. Are 300v too much for deflection coil or they resist that voltage?
Nice and neat , now what about converting CRT TV set to Oscillooscope ?!
It's doable, maybe in one of my next videos
@@MirkoPavleskiMK You may want to try one of those black-and-white portable TVs. They're 5 or 7", just about the size and shape of an analog oscilloscope. You don't need them much bigger than that.
By the way, it's a nice oscilloscope you made. It looks like the ones we see in those electronics magazines from the 1950s. Well done.
I have used that high voltage power module to make fender champ guitar amp clone and it works fine (which is strange)
around 300v too from 19v notebook power adapter
Shame this has so little view and comments. I recently got my hands on an old sports radio type TV I planned on doing something similar with. I figured it should largely just involve interrupting the H and V scan with my signal but I heard there are update issues with the frequencies they are capable of displaying. Any thought on that?
3:00 info starts here.
Nice work !
I would like to know what material you use to build the boxes
5mm PVC board
cooooooooooool!
What is the bare minimum circuit to just get something on the screen?
Советского Союза давно уж нет а как много он сделал.
Ahoj Mirko! A took apart a huge projection TV you know with the Frensel lense. there are 3 small diameter CRT tubes inside, and I kept it aside for some similar useful project maybe a Curve Tracer, but I have not much knowledge yet about CRTs. What's your guess, are those tubes ideal? Is there a possibility to determine it by e.g. the resistance of the horizontal and vertical coils? Any suggestions?
Unless you just want to make an arty display it would be better to get an electrostatic deflection CRT. The difference in possible bandwidth will be profound.
👍
why is that signal looking like that? i mean it is "rolled up" horrizontaly in center of the screen (donut like), not like in usual oscilloscopes where it is flowing from right edge to the left edge of the screen? nice project anyway
Hi! I'm seriously thinking about following your example and making one myself, it really doesn't seem to be impossible even for a amateur tinkerer like myself.
I'm currently thinking about the high voltage source - since I don't have a 12v to 400V boost converter at hand, is there a reason (other than safety of course) not to use rectified and smoothed mains voltage? 230VAC should give me 325VDC using just a bridge rectifier, that should be plenty...?
Thanks!
Feasible, but very dangerous, especially that during experimentation we often forget about caution and safety
@@MirkoPavleskiMK So as a "temporary" solution then, till the AliExpress boost converter arrives... 😉
This could be further reduced using a camcorder viewfinder CRT.
Please make a 2 channel oscilloscope using SST7735 and ESP-32 ,
Please please please,
Hi Nice Project, but the Power of this HV DCDC is no more than 30W and up2 40W for short Time. I completely redesigned it to be more EMI Quiet but I used the same transformer Size and same PCB Size (although completely new Layout, I redesigned the Transformer too and had it made by RANLO in China) . The Transformer is a EFD25/13/9 core Size and the China DCDC runs it at ca. 75KHz.
Can you make video to interface cellphone with old rotary phone ? I saw one wired unit and other Bluetooth..both above 60$ cost . can u make it diy ?
60 is not a bad price to be fair. It would be quite a bit of programming to make something be able to dial with the click tones and convert those to actual dialong on the phone. Way more hours trying to get that part to work than 60$ worth in my opinion.
nice project but, crt tubes normaly need also a negativ voltage, this could also explain why you are only able to use like 2/3 of the screen
Do you mean the sweep voltage? In this case the sweep voltage is AC coupled to the tube by means of a capacitor, so it is centered on zero volts DC.
8:10. Looks like he built the signal generator too. Or fished it out of a bucket of water.
Браво! Но на осцилоскопът му трябват усилвател по вертикал , усилвател по хоризонтал, диапазонен честотен ключ за хоризонталната честота , няколко потенциометъра и ще стане един красив мини аналогов осцилоскоп! Аз също си правя аналогови осцилоскопи. Новите аналогови осцилоскопи са много скъпи... и не мога да си ги купя...😉
Where is that CRT from though???
Ebay
Em coil ratio
construye uno de 1MHz!!!
I’d like to try this with a 5.5in CRT from a cheap TV…🤔
I’ve built similar devices, but they were even less accurate than yours..😂👍