I've used a few different flavors of these cheap digital meters (0-500VDC, 120VAC, 300VDC) and have not had any problems....yet. Most of them are self-powered, which is handy because it doesn't require a separate power supply, though risky because they do create a potential source for a short. Everything I build has fuses, so even if one of these things shorted-out, it would just blow a fuse. All but one of them are in metal cases, so if they caught fire, it would be contained.
The most dangerous line-powered items I know of are LED bulbs; even worse than CFLs due to their construction. I've replaced several on the verge of failing, or already failed, that have obvious signs of overheating or will actually still hot in the socket. Hmmmm....now I gotta go burn one to see if the plastic is self-extinguishing. I'm pretty sure those cheap meters will burn on their own once ignited, but I'm not sure I want to destroy one in the name of science.....unless I can find a *really* cheap one. On Tuesday, May 2, 2023 at 11:54:36 AM UTC-7 Benoit Tourret wrote: > I am a bit afraid of all those inexpensive displays made in PRC, the > seller often doesn't know what he is selling, the specs are wrong or > trunked, and I don't know their behavior with 300V DC or more... > > Well, I ran a few of my IN-1, I had to run a couple of them at 4mA 180V > and the black marks disappears completely after 4h. I can reduce to 150V > 2mA and still have a good glow. > those tubes are very nice with the "normal" 5, much better than the IN-4. > should be nice on a 6 digit clock with a decatron for tenths of a second. > > Le mercredi 26 avril 2023 à 00:37:49 UTC+2, gregebert a écrit : > >> Looks good. I've gotten very fond of the inexpensive digital meters on >> Ebay and started putting them in many of my projects. >> >> On Tuesday, April 25, 2023 at 10:16:21 AM UTC-7 Benoit Tourret wrote: >> >>> [image: 20230425_170205.jpg] >>> Here is the first try for my testing devices. >>> My HT power device, with the voltage regulated with the rheostat. next >>> step will be the rheostat for the output power and placing the voltmeter >>> after the limitation resistors and an on/off switch. >>> The box is just to have an idea of the size. may be I will print >>> something or find a more accurate box... ;-) >>> I will add a 5V USB power supply >>> >>> on the left an arduino uno with a hat and a zif for testing K155id1 with >>> a 12 pin SIL connector for a nixie tube, here a support for IN-1. >>> I made one for IN-12, I am making one for IN-2 and one other for IN-4. >>> >>> on top of the box, a 12 position manual switch. I will use a Protoboard >>> for better contacts. >>> >>> Le samedi 22 avril 2023 à 22:31:34 UTC+2, Benoit Tourret a écrit : >>> >>>> Thanks Terry. >>>> >>>> this also will help me a lot. >>>> My electronic courses are too far to be clear in my mind... >>>> >>>> When I read gregebert's thread, I wanted to write the complete >>>> equation to calculate the resistor for a wanted current. but the result >>>> was >>>> the opposite of the reality... >>>> so I decided to use a potentiometer and a galva... >>>> but you gave me the result !!! >>>> Le samedi 22 avril 2023 à 22:13:14 UTC+2, Mac Doktor a écrit : >>>> >>>>> Reading this thread has begun to make my eyes glaze over. I find the >>>>> following diagram to be helpful for understanding some of what's going >>>>> on. >>>>> Perhaps it will add some clarity to the discussion. This in from Marcin >>>>> Saj's github and specifically concerns his PRO Nixie Tester: >>>>> >>>>> [image: pro-nixie-tester-how-to-use-02.jpg] >>>>> It took a while for me to completely understand how all of this works >>>>> and this diagram was a huge help. I doubt that I would have worked it >>>>> clearly otherwise. For the record I haven't gotten around to reading the >>>>> JB >>>>> Dance book—yet. >>>>> >>>>> Full info here: >>>>> >>>>> https://github.com/marcinsaj/Universal-PRO-Nixie-Tester-and-Healer >>>>> >>>>> >>>>> Right now I'm using the PRO Nixie Tester with three DMMs but I've >>>>> purchased some DPMs for a compact, dedicated meter bridge. Someday I'll >>>>> get >>>>> around to making a panel and wiring them up. And rigging up isolated >>>>> power >>>>> supplies for them. >>>>> >>>>> >>>>> On Apr 22, 2023, at 1:50 PM, Moses <[email protected]> wrote: >>>>> >>>>> That yh11068a module is rated for 40 watts! That is like 10 times what >>>>> you would need for most nixie clocks! Be careful at higher voltages, a >>>>> 200mA capable supply at a few hundred volts will hurt you good. >>>>> >>>>> >>>>> Zaparooney. x_x >>>>> >>>>> >>>>> Terry Bowman, KA4HJH >>>>> "The Mac Doctor" >>>>> >>>>> https://www.astarcloseup.com >>>>> >>>>> "If only you could see what I've seen with your eyes."—Roy Batty, *Blade >>>>> Runner* >>>>> >>>>> -- 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 [email protected]. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/ad984556-efbd-46aa-b54b-5e1d3d1e8df1n%40googlegroups.com.
