Oscilloscope
From Eric
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I have bought a russian 5LO38I tube on [https://www.ebay.com/itm/5LO38I-5cm-2-Small-Russian-Oscilloscope-Green-Electrostatic-CRT-Tube-NEW-NOS/251479458626?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649) ebay]. | I have bought a russian 5LO38I tube on [https://www.ebay.com/itm/5LO38I-5cm-2-Small-Russian-Oscilloscope-Green-Electrostatic-CRT-Tube-NEW-NOS/251479458626?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649) ebay]. | ||
| - | The tube is delivered with a russian notice. Hopefully, someone has provided | + | The tube is delivered with a russian notice. Hopefully, someone has provided a german translation translation: |
| - | + | [[File:5LO38I-datasheet.jpg|400px|thumb|none]] | |
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Several schematics to generate the high-voltage power supplies: | Several schematics to generate the high-voltage power supplies: | ||
| - | * From | + | * From http://danyk.cz/osc_en.html: |
[[File:5LO38I-hv-1.jpg|400px|thumb|none]] | [[File:5LO38I-hv-1.jpg|400px|thumb|none]] | ||
| - | * From | + | * From http://speakyssb.blogspot.com/2016/08/5lo38i-crt-test.html: |
[[File:5LO38I-hv-2.jpg|400px|thumb|none]] | [[File:5LO38I-hv-2.jpg|400px|thumb|none]] | ||
[[File:5LO38I-hv-3.jpg|400px|thumb|none]] | [[File:5LO38I-hv-3.jpg|400px|thumb|none]] | ||
| - | * From | + | * From http://www.cfp-radio.com/realisations/rea75/tv2pouces-01.html |
[[File:5LO38I-hv-4.jpg|400px|thumb|none]] | [[File:5LO38I-hv-4.jpg|400px|thumb|none]] | ||
Revision as of 10:39, 9 January 2021
Contents |
General information about CRT tubes
Some explanations about the functioning of a CRT:
- http://www.cfp-radio.com/realisations/rea75/tv2pouces-01.html
- http://speakyssb.blogspot.com/2016/08/5lo38i-crt-test.html (5LO38I tube)
- https://www.electrical4u.com/cathode-ray-oscilloscope-cro/
- https://www.circuitstoday.com/crt-cathode-ray-tube
- https://www.aplustopper.com/cathode-ray-oscilloscope-construction-working/
General diagram
The most popular schematic, from Elextronixandmore, using a Hammond transformer. A kit can be bought at Catahoula Technologies. The schematic and the BOM are here.
Another one solid-state scope from Electronixandmore, without isolation. The voltages are the following:
HV 350V Anode Cap X1/X2/Y1/Y2 280V Deflection plates A2 270V Anode 2 A1 -310V Anode 1 K -665V Cathode G1 -675V Control Grid
Those values are fine for a 3BP1 tube.
The tubes
5LO38I russian tube
I have bought a russian 5LO38I tube on ebay.
The tube is delivered with a russian notice. Hopefully, someone has provided a german translation translation:
You can find several applications of the 5LO38I:
- http://danyk.cz/osc_en.html
- http://speakyssb.blogspot.com/2016/08/5lo38i-crt-test.html
- http://www.emartinka.cz/index.asp?IDKategorie=9&IDClanku=18&Akce=clanek
- http://www.labguysworld.com/ES_CRT_DEFLECTION.htm
- http://users.triera.net/zupanbra/osciloskop/Mali_osciloskop.html
- http://www.webx.dk/oz2cpu/clock-scope/scope.htm
Several schematics to generate the high-voltage power supplies:
Chinese 8SJ31J tube
See Aliexpress (8SJ31 from GuangYi store (Aliexpress).
The datasheet can be found here : http://www.ges.cz/sheets/8/8sj31jv2.pdf
Other schematics
- https://www.webx.dk/oz2cpu/clock-scope/scope.htm
- http://www.jogis-roehrenbude.de/Leserbriefe/Scope-Clock/Scope-Clock.htm
- https://web.jfet.org/vclk/
- http://www.catahoulatech.com/index.php?product=KIT-0001|PCB
- http://www.sgitheach.org.uk/scope2.html
- http://ludens.cl/Electron/scope/scope.html
- https://www.eevblog.com/forum/projects/oscilloscope-under-construction/
- https://www.eevblog.com/forum/projects/2-inch-video-monitor/
Other topics
Oscilloscope music:
- https://oscilloscopemusic.com/software.php (a software to generate pictures using X-X modulation))
See also:
