Відео

I always wear gloves when working on projects. Saves time cleaning fingerprints and skin oils off later.

The radiation I'm referring too is normal background levels. There is a small amount of ionizing radiation everywhere, and these stray ions are usually what will "kick off" ionization inside the tube once a strong electric field (from high voltage) has been applied. The numbers change inside of the tube by switching the circuit across different segments. In a numeric tube (0 to 9), each number is an individual piece of metal, acting as a cathode. An external circuit will connect and disconnect each number. So if you connect 2 numbers across the high voltage circuit, they will glow at the same time.

Thank you!

Hey Ilya. I was thinking about DRAM recently as well. A friend suggested that I should try heating/cooling DRAM chip while running, this might show change and help isolate part. I don't think unit has any ram test built in software. I will order some new ram chips anyways because they are cheap. We will see! Yes, it is strange how the instrument does not detect anything wrong with crazy readings! Self test is also useless on this model. It just checks few basic things on ADC/range switching and always passes...

Hey Mike. It is strange that there are no errors shown if the DSP program is corrupted. I did reinstall the firmware update package several times too. It has several parts and all of them installed and verified successfully. I'm not sure if the flash on the ADSP-21369s is updated during this process. The way the flash ICs for each DSP are marked with a custom "U8903-X" part # leads me to believe they are preprogrammed. I don't think this issue could be the DRAM for the DSP going bad? Each DSP has an external 128Mb DRAM as well. Besides getting flash from a working unit, the only other routes I can think of are to replace the other DSP processors (the other ADSP-21369 and the one other ADSP-BF535P also on the board). Keysight condemned the unit outright. Because it is declaired "obsolite" the motherboard is not even available for replacement (they would never do component level repair/diagnostic/reprogramming in the first place).

Thank you!

Haha yup! Maybe I'm feeling indulgent ill pick one of those up too. The biggest problem is running out of room to store the collection..

Thank you!

Thank you! I see that you have quite the collection of fans too. I have a bunch as well, but I chose these as they are the high power ones and are more interesting. The DiaForce is what made me want to do the video, it's quite an interesting fan.

​@@neonkev7866if you didn't know, Sanyo Denki (San Ace) fans are made in the Philippines.

​@@neonkev7866Sorry in advance, how do I turn on the EbmPapst 5318/2TDH4P fan? cause I just bought it, and if I just use the +red & -blue cable, the fan won't spin

@@Jeff_FanCollector Hi Jeff, are you using 48 volts DC for the fan?

Thank you. Yes, it would be very effective at cooling you off. Just make sure to wear ear plugs and safety glasses. And make sure there are no small, loose objects behind it before turning on!

@neonkev7866 I research industrial fans lol, I know all about that. We sent a few things flying from the other end of the workshop

Not much unfortunately. Just been busy with test equipment; I stalled on the software for that proj. since that was way above my head at the time. It will return it due time..

Thank you! The 9PC8666X-S001 can only support 3.3 volt or 5 volt PWM voltage. You will need PWM signal up to 12 volts for Diaforce. Diaforce also supports control with 0-10 volts DC voltage (no PWM). Maybe you can make this signal with voltage divider using potentiometer.

​@@neonkev7866 oh.. I have the 9PC8666X-S001(I bought it a long time ago) I can know the special level shifter circuit buy's URL??

@@김규헌-k5l I put all the files for controller and level shifter on my website here: neonkev.com/2023/11/06/universal-high-power-4-wire-pwm-fan-controller/ You can download and order PCB and parts, then solder it together.

​@@neonkev7866 wow thank you!! I will order on JLCPCB the pwm level shifter circle.

@user-tz9xo4xd1y great! looking forward to a video with diaforce perhaps

Nixies certainly are expensive. However, if you look at the original prices when they were in production, they were also quite expensive historically. That's why nixies were used mainly in scientific and industrial equipment; not so much in consumer electronics at the time. Nixies may seem like simple devices at first glance, but I assure you that it is quite complicated in practice between the materials science and manufacturing techniques. Just ask Dalibor Farny.

Thank you David! The microcontroller design enables you to incorporate any feature you can code and fit in the memory. I’ve built discrete PWM controller designs using 555 timers as well; finally decided to buckle down with some newly learned skills and try to make "the" fan controller I always wanted.

I'd love to be able to make a digital one but it's out of my scope. Interestingly, I have just acquired a Nidec Servo G1238V48BHZP-95​ and it runs perfectly, but I can't for the life of me get it to respond to speed control and I'm suspicious it's the frequency (which I'm running just below 5KHz). What freq were you using for your Servo fans? It's nigh impossible to get the datasheets for these puppies...! *EDIT: Never mind, I had the tach wire instead of the control wire. If only the colours were standardized, life would be so much easier!

Thank you for sharing your story with us. That must have been quite the experience, to be there on the Burroughs production line. I wonder if most of today's technology will be working some 60+ years later!

Thank you! Yes, the LO1 unlock error is quite common on these units. The culprit is cold solder joints on one of the 3 VCOs used in the spectrum analyzer portion. The Signal Path actually has a great video where he covers a repair of this condition: ua-cam.com/video/1_M-Wccn2w8/v-deo.htmlfeature=shared I've repaired a bunch of 2721Bs with this fault too. If you're not comfortable doing it yourself, feel free to reach out through my business contact in the description.

Pretty much. The bootable compact flash can be removed without damage by first unscrewing the motherboard. They don't bother and just break the socket ripping it out. They also rip all the SRAM off on the back of the mobo. Ironically, there is also more SRAM on the front but that never gets touched, again because nobody bothers to remove the motherboard.

Thank you! The wires and PCB do certainly warm up, but I made sure to use heavy enough wires and make the traces wide on the PCB. I did a test on the PCB with my thermal camera and a programmable load. At 10 amps continuous, the hottest spot on the PCB are the input traces where the power comes in. Peak temp is 60C with no active cooling. I added the 5V aux fan output so you can add a small fan to cool the board if you want to run 15 amps + for long times.

The blue light filter does help with eye strain. Once you get used to it, you realize how intense regular settings are.

@@neonkev7866 was being cheeky. Great job. 👍

I am not experienced in pad strip restoral, and this was not a good first project to practice on. I'd rather send it to a pro in this method than risk damaging this board myself. Plus, I enjoy Alex's content and wanted to show some support.

Yeah it would be nice if the missing/erronious calibration memory threw a distinct error, instead of generating a random hardware error. Thanks for watching!

Hey Jakob! We save surplus T&M equipment from landfills, refurbish the equipment, and sell it to hobbyists and startups throughout the world. Happy to be part of the green ecosystem.

In all fairness, most of this equipment isn't that old (< 20 years) and is still worth a lot to legitimate businesses. It is notably less expensive than buying new. The target market isn't the average hobbyist; a reality for brand name, high performance equipment. Most hobbyists don't have a use for a 40GHz+ sampling oscilloscope with a maximum input of 5 volts into 50 ohms...

Thank you. Yes, this could have been a possibility, I suppose we will never know. I was inclined to believe the unit had a hardware problem since it had been set aside as such.

Thanks for tuning in Illya! They do have a huge and mixed inventory; I can see some boxes slipping through the cracks if needing service before resale. Hopefully they were able to make it right.

Hey illya. Sorry to hear about the mixed experience. Reach out directly to me. I’d be happy to discuss it and make it right if possible. Thanks!

Thank you! Always looking to share and learn new ways to solve problems.

I don't see that ESD awareness at Northridge. My Lab was scrupulous about it when we were developing cellphone WiFi for the first time...what we didn't need was extraneous surprise failures along the way!

Interesting point, that is certainly an anachronism (nixies during the manhattan project). Whatever looks good on screen, I guess!