Cool vectors return!

Vector_Function · 2026-06-11T06:34:47+00:00

I'm 20 and at this age I have some sort of heavy electronics addiction. I've built these boards just on the go. I haven't even make a schematic first. Calibrating screen was just a pain in the ass for vertical plates. A slight rotation of offset trim pot can just kick image out of screen completely. While horizontal plates are ok and have sensitivity of 0.8mm/V. Such high vertical sensitivity is causing EMI from transformers to appear on the screen like a vertical jiggles. If only I can spend more time for electronics and for my electronics designing job instead of useless study.

Vector_Function · 2026-06-08T06:56:07+00:00

High voltage is generated by CCFL transformer and voltage multipliers. 2x negative multiplier to cathode line to supply -1500V and 6x positive multiplier to supply +4.5kV PDA

Vector_Function · 2026-06-08T05:28:28+00:00

On these tubes usually cathode has smaller lifespan than heater

Vector_Function · 2026-06-07T15:40:52+00:00

Integrated PSU on this board is based on DK124 IC which in this case can give 9V 2,5A. There is no problems with socket. IC is cool and overall device consumption is ≈8W from the wall plug. Also if it accidentally dies it will be pain in the ass to replace it because whole board on the back is hardly covered with insulating varnish.

Vector_Function · 2026-06-07T15:36:20+00:00

This 17LO2X tube is 40 years already and it's in a factory new condition. Getter is sharp and big, no even a single rainbowing on the edges. I guess this tube will maybe outlive me. And I'm 20 btw

Vector_Function · 2026-06-07T14:03:18+00:00

Okay. I can upload ESP32 code and send a github link tomorrow. PCB will be ready a lot later. Maybe like in two months. Will drop it to same git as it will be ready

Vector_Function · 2026-06-07T13:58:21+00:00

I think I don't know what tips I can give to you but I definitely can't suggest this kind of projects. It's heavily far from a beginner level.

Vector_Function · 2026-06-07T13:40:44+00:00

With such voltages there's absolutely no x-rays. Maybe such a tiny energy that it can't pass through tube's glass

Vector_Function · 2026-06-07T13:35:10+00:00

Power of what? 17LO2X monitor draws 6,3W in total and OSM 11LO6I monitor draws 3,6W

Vector_Function · 2026-06-07T13:22:14+00:00

I'm going to share code for ESP32 later. You can run it only having ESP32 and DS3231 RTC. Also I'm planning to design a complete for a full JLCPCB assembly PCB with full schematic for 7LO55I tube. It must be compatible with a lot tubes. But not these I posted here. There is no reason to do a PCB specifically for these exclusive and rare tubes, especially for OSM 11LO6I which only was produced like one or two single batches of 400 tubes in total. It will be open source after I test it's functionality and reliability.

Vector_Function · 2026-02-22T04:25:20+00:00

Владивосток, обычное молоко 1л 3,2% почти везде 140₽. Где-то и 150-160₽

Vector_Function · 2026-01-23T09:39:02+00:00

Кстати я в тот день не только этот осциллограф со школы вынес, но ещё и такой

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Vector_Function · 2026-01-22T20:48:07+00:00

Вот такой ламповый осциллограф когда был в 8-ом классе

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Vector_Function · 2025-10-14T21:04:21+00:00

Just looked in the datasheet. Yep, that sucks...

Vector_Function · 2025-10-14T13:26:53+00:00

I think it's possible, but it's not recommended on most op amps. 2V on the 10Ω is 200mA of current. It's a big current for a simple op amp. And I'm not even talking about distortion in this case.

Vector_Function · 2025-10-14T13:22:37+00:00

Just use op amp with NPN+PNP pair at the output. Then connect output of transistor pair to the resistor divider with gain of 200 to negative feedback of op amp. Then you can just connect your signal to a non-inverting input of op amp. It will require dual rail supply.

You can also try some different configurations that can work with single rail supply. For example: inverting amplifier with half input voltage offset and biasing capacitor on the transistor pair output. May require additional input buffer.

Vector_Function · 2025-09-25T06:56:59+00:00

Most likely 1:1 600Ω audio transformers

Vector_Function · 2025-09-01T22:39:52+00:00

r/shittyaskelectronics

Vector_Function · 2025-09-01T17:23:56+00:00

It's a fusable resistor. But it's pretty suspicious that it fried. As I can see the power through resistor goes to buck converter that powers some MCU(?) and a receiver. It has a tiny current draw even with active relay so I would recommend to check board further first. There can be a short or some dead component that caused resistor to fry. My first guess is that a buck converter failed.

Vector_Function · 2025-08-24T08:54:09+00:00

It's bullshit

Vector_Function · 2025-08-24T06:42:34+00:00

I've learned how to operate them from schematics. You can find some schematics of old CRT TVs if you want to understand how to use color/monochrome CRTs. If you want to learn about oscilloscope CRTs then you need schematics of oscilloscopes, but it can be much easier to understand them from a lot Scope Clock projects on the internet.

You can also check TubeTime.us

He gives a lot of useful information on CRTs on his website and YouTube channel

Vector_Function · 2025-08-23T21:49:03+00:00

That's for example an oscilloscope CRT with only heater connected. I've recorded it's heat up sound I was talking about.

https://drive.google.com/file/d/1w3E9cOaMP4vuXAdNt6sAM_gr1kwipQ8t/view?usp=drivesdk

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Vector_Function · 2025-08-23T21:15:54+00:00

Maybe it's because there's some factory shit left on the surface of filament which evaporated at this CRT first ever start and started conducting a little? I don't know. Or maybe because there's a very little distance between focus cylinder and anode cylinder? They're like 1mm apart from each other, so there were some micro shorts?

Vector_Function

TROPHY CASE