Attached my approach of driving the tubes filament and blanking with an of-the-shelf transformer from würth. Hopefully still available @wurth. I've got mine as sample. The heaters current is configurable via resistor. The HV insulation works pretty well. No arcing, which I had on my self wound one. I'm driving the MAX25256ATBA with 12V, which results in roughly 6.3 volts 300mA.
On Saturday, June 10, 2023 at 6:21:11 PM UTC+2 Max Di Noi wrote: > Oh, that’s very nice of you. That would help, I’m only making a couple of > boards, one for me and one for my parents as a gift. > > I’m in the UK, Adrian. Would you ship it? Please PM me for details. > > > > On 10 Jun 2023, at 17:17, Adrian Godwin <artg...@gmail.com> wrote: > > I think I have an unused teensy 3.6. > It may take some time to track it down but I'd happily swap it for a 4.1 > if that simplifies things for you. > > On Sat, Jun 10, 2023 at 5:03 PM David Forbes <nixie...@gmail.com> wrote: > >> Here is the schematic of the SCTV rev E, which uses the Teensy 4.1. >> >> >> On Sat, Jun 10, 2023 at 8:51 AM Max Di Noi <flata...@gmail.com> wrote: >> >>> Thanks for your prompt reply David. >>> >>> I have already printed my board for a Teensy 3.6. I have no issues >>> soldering tiny smd components assuming that I can get an LTC22632! I may >>> design a small PCB to super-impose the Teensy 4.1 over the existing >>> footprint and layout. In doing so, I could add the dual DAC on this new >>> adapter board. I can see CS is connected to pin10 but where are CLK and SDI >>> of the LTC2632 connected? I don’t see them in the code. Yes, It would be >>> great if you could post diagram for SCTV-E for Teensy 4.1 please. >>> >>> Interesting that you are redesigning the transformer. I managed to >>> hand-wire mine and seems to work well. The 6.3V for the heater is the one >>> that I’m not too sure how to calibrate exactly, since the SMPS… It shines a >>> bit too bright at the moment and voltage drops to 2V, so that’s not healthy >>> for the heater filament. I can remove a few turns but not sure what is the >>> ‘exact’ RMS V I’m looking for given the spikes of the SMPS at 100Khz, I’ll >>> continue to experiment on that using a 6.2V 500mA lightbulb to avoid >>> damaging the CRT. >>> >>> Thanks again for updating the schematic when you get a chance, it’ll >>> save me so much time to experiment. >>> >>> >>> >>> On 10 Jun 2023, at 16:41, David Forbes <nixie...@gmail.com> wrote: >>> >>> Hi. The SCTV with the Teensy 4.0 uses an LTC2632 dual DAC. This uses SPI >>> to load the X and Y values. It's about half the update rate of the built-in >>> DACs in the previous Teensy 3.6, so I had to change the step size in the >>> drawing routines. >>> Unfortunately this chip is tiny, so it's hard to solder. >>> I am in the process of redesigning the transformer and circuit board to >>> be more friendly for kit and DIY use. I want to make the PC board with >>> through hole parts, since people enjoy soldering those together. >>> I will see if I can post the latest SCTV schematic diagram to my website >>> today. I've been traveling a lot lately. >>> >>> >>> On Sat, Jun 10, 2023, 6:33 AM Max DN <flata...@gmail.com> wrote: >>> >>>> True, but the schematic is SCTV rev. C which is for Teensy 3.6. Does >>>> anyone have the schematic for using Teensy 4.1? Just designed a clock >>>> based >>>> on SCTV-rev and custom transformer but of course I have now realised that >>>> Teensy 3.6 is impossible to get... >>>> >>>> Il giorno sabato 11 marzo 2023 alle 18:41:05 UTC SD ha scritto: >>>> >>>>> David Forbes has the schematic on his website, and the firmware on >>>>> Github. I did not see that Jörg was making kits, in fact he said he >>>>> didn't >>>>> want to make kits, but perhaps make a PCB available, so I do not know why >>>>> people are asking for kits. >>>>> >>>>> On Friday, March 10, 2023 at 3:42:49 PM UTC-5 liam bartosiewicz wrote: >>>>> >>>>>> The schematic and software would be good enough for me, personally >>>>>> >>>>>> On Mar 10, 2023, at 10:15 AM, Darrin Weiss <hip...@gmail.com> wrote: >>>>>> >>>>>> I also have some interest in a kit >>>>>> >>>>>> >>>>>> >>>>>> On Friday, March 10, 2023 at 10:00:11 AM UTC-5 Richard Arndt wrote: >>>>>> >>>>>>> Yep... put me down too for a Scope Clock kit of parts :-) Making >>>>>>> the H/W & S/W open source would be cool too! >>>>>>> >>>>>>> I think selling PCB's & parts in kit form without enclosure, places >>>>>>> FCC requirements on the user to not cause RF interference. >>>>>>> >>>>>>> Isn't that how SparkFun and Adafruit can sell assembled PCBs without >>>>>>> FCC certification? >>>>>>> >>>>>>> On Thursday, March 9, 2023 at 9:19:56 AM UTC-5 Paul Andrews wrote: >>>>>>> >>>>>>>> Do you plan on publishing the software (on GitHub for example)? >>>>>>>> >>>>>>>> On Mar 8, 2023, at 5:36 PM, jörg <pos...@gmail.com> wrote: >>>>>>>> >>>>>>>> >>>>>>>> >>>>>>>> The tube is a RFT B7 S4-01 >>>>>>>> It‘s from an EO174A Oscilloscope. >>>>>>>> Nice green and pretty good to focus and linearity to the edges. >>>>>>>> The tube and first version of PCB could be viewed at >>>>>>>> https://m.youtube.com/watch?v=zTyXJE2faXw >>>>>>>> <https://eur04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fm.youtube.com%2Fwatch%3Fv%3DzTyXJE2faXw&data=05%7C01%7Cjoerg.postert%40otto.de%7C934c425d99ee4b01af7008db202467fd%7C8794e153c3bd44798bea61aeaf167d5a%7C0%7C0%7C638139112953496744%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=7yQJJjU6SCFcfQu%2BVxKoA8R9%2B%2FrsA1AVJOuO76nxNq8%3D&reserved=0> >>>>>>>> >>>>>>>> I do not plan a kit or selling like david forbes do. >>>>>>>> First of all, it is initially his design and software. Second, I do >>>>>>>> not have the will and time to go through all the regulations >>>>>>>> EU/Germany has >>>>>>>> for selling such electronics. >>>>>>>> I could share the PCB if I order the next batch, but it is not >>>>>>>> finished, yet. >>>>>>>> I plan to add ESP32 for NTP and web config. >>>>>>>> >>>>>>>> >>>>>>>> On Sunday, March 5, 2023 at 8:02:28 PM UTC+1 Nicholas Stock wrote: >>>>>>>> >>>>>>>>> Definitely not off-topic! I think everyone on this forum >>>>>>>>> appreciates that post, well done. I really like the starfield effect. >>>>>>>>> What >>>>>>>>> tube were you using? Looks like it has very good linearity across the >>>>>>>>> whole >>>>>>>>> screen.... >>>>>>>>> >>>>>>>>> Cheers, >>>>>>>>> >>>>>>>>> Nick >>>>>>>>> >>>>>>>>> On Sat, Mar 4, 2023 at 11:55 PM Wo Tu <wtu...@gmail.com> wrote: >>>>>>>>> >>>>>>>>>> Hi ! >>>>>>>>>> Really interesting and great work. Looks really good and its a >>>>>>>>>> „want to have“. >>>>>>>>>> Would be interested in pcb and code too , if possible a kit too. >>>>>>>>>> Thank you. >>>>>>>>>> >>>>>>>>>> Michail Wilson schrieb am Samstag, 4. März 2023 um 15:11:01 UTC+1: >>>>>>>>>> >>>>>>>>>>> I am very interested as well. >>>>>>>>>>> >>>>>>>>>>> >>>>>>>>>>> >>>>>>>>>>> Would love to have the code and pcb design and even a kit. >>>>>>>>>>> >>>>>>>>>>> >>>>>>>>>>> >>>>>>>>>>> I read through the posts, but didn’t see anything other than the >>>>>>>>>>> video. Thumbs up on it too. 😊 >>>>>>>>>>> >>>>>>>>>>> >>>>>>>>>>> >>>>>>>>>>> Michail Wilson >>>>>>>>>>> >>>>>>>>>>> 206-920-6312 <(206)%20920-6312> >>>>>>>>>>> >>>>>>>>>>> >>>>>>>>>>> >>>>>>>>>>> *From:* neoni...@googlegroups.com <neoni...@googlegroups.com> *On >>>>>>>>>>> Behalf Of *jörg >>>>>>>>>>> *Sent:* Saturday, March 4, 2023 7:14 AM >>>>>>>>>>> *To:* neonixie-l <neoni...@googlegroups.com> >>>>>>>>>>> *Subject:* Re: [neonixie-l] ScopeClock with teensy4.0 >>>>>>>>>>> >>>>>>>>>>> >>>>>>>>>>> >>>>>>>>>>> @Jon, >>>>>>>>>>> >>>>>>>>>>> >>>>>>>>>>> yes, I will share the code. I have moved it to the VS Code IDE >>>>>>>>>>> with PlatformIO. I do not like the Arduino IDE much. It should run >>>>>>>>>>> on >>>>>>>>>>> david's hardware, too. >>>>>>>>>>> Do yo you have build the hardware already? >>>>>>>>>>> >>>>>>>>>>> On Friday, March 3, 2023 at 5:12:46 AM UTC+1 David Forbes wrote: >>>>>>>>>>> >>>>>>>>>>> I was able to change to a Teensy 4.1 with a 2 channel 12 bit SPI >>>>>>>>>>> DAC in my latest version. I had to reduce the DAC rate by half. It >>>>>>>>>>> looks >>>>>>>>>>> just as good as the old version. Of course, the DAC I chise is >>>>>>>>>>> already >>>>>>>>>>> unobtanium. >>>>>>>>>>> >>>>>>>>>>> >>>>>>>>>>> >>>>>>>>>>> >>>>>>>>>>> >>>>>>>>>>> >>>>>>>>>>> >>>>>>>>>>> On Thu, Mar 2, 2023, 7:17 AM jörg <pos...@gmail.com> wrote: >>>>>>>>>>> >>>>>>>>>>> Hi, maybe a bit offtopic. >>>>>>>>>>> >>>>>>>>>>> I've put some effort in using the teensy4.x to run the scope >>>>>>>>>>> clock based on david forbes one. >>>>>>>>>>> The teensy3.6 based one is running on my own hardware for a >>>>>>>>>>> while. >>>>>>>>>>> >>>>>>>>>>> But because of CPU shortage and the use of the teensy3.6 >>>>>>>>>>> internal DAC's, I was curious to get the stuff up and running on >>>>>>>>>>> the faster >>>>>>>>>>> teensy 4.x CPU. >>>>>>>>>>> In this approach I'm using a parallel driven 12 bit 4 channels >>>>>>>>>>> DAC. The usage of a serial DAC was too slow and I did not get DMA >>>>>>>>>>> up and >>>>>>>>>>> running on teensy4.x. >>>>>>>>>>> Anyway, this works and I like it. >>>>>>>>>>> >>>>>>>>>>> Video: https://youtu.be/HYwgyYnQUxw >>>>>>>>>>> >>>>>>>>>>> >>>>>>>>>>> -- >>>>>>>>>>> You received this message because you are subscribed to the >>>>>>>>>>> Google Groups "neonixie-l" group. >>>>>>>>>>> To unsubscribe from this group and stop receiving emails from >>>>>>>>>>> it, send an email to neonixie-l+...@googlegroups.com. >>>>>>>>>>> To view this discussion on the web, visit >>>>>>>>>>> https://groups.google.com/d/msgid/neonixie-l/a2701743-2b9b-4543-a0c0-32b8b90da85an%40googlegroups.com >>>>>>>>>>> >>>>>>>>>>> <https://groups.google.com/d/msgid/neonixie-l/a2701743-2b9b-4543-a0c0-32b8b90da85an%40googlegroups.com?utm_medium=email&utm_source=footer> >>>>>>>>>>> . >>>>>>>>>>> >>>>>>>>>>> -- >>>>>>>>>>> You received this message because you are subscribed to the >>>>>>>>>>> Google Groups "neonixie-l" 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Isolated_PWS.pdf
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