Re: [neonixie-l] МТХ-90~MTH-90 Keypad from eBay - What is it and how do I hook it up?
Yes, the ones I have also use an M22K (220K) resistor. The tubes in mine aren't labeled at all but they're the more common MTH-90 tube without a nipple on top and the unit has clear lenses. They come without any screws to attach the top cover to the lower part of the case so it seems they're meant to be screwed on to something else. On Sunday, April 18, 2021 at 2:11:34 AM UTC+2 Terry Bowman wrote: > I did a quick search and these these things are for sale on Etsy and > various other merchant sites I've never heard of. Similar pricing but eBay > does give you something resembling a safety net. > > White plastic with red lenses seems to be the norm. > > > On Apr 17, 2021, at 5:49 AM, Dekatron42 wrote: > > I had one of these many years ago and if I remember correctly now it is a > resistor of some 100k, or perhaps it was closer to 1Meg, as it just limits > the current flowing in the trigger circuit. You can google these and find > circuits like the ones below: > > > I finally dug a meter out and checked the component marked "M22". Sure > enough it's a .22MΩ (220kΩ) resistor. It's connected directly to the > touch-sensitive "key" on the front. > > > On Apr 17, 2021, at 3:21 PM, Yohan Park wrote: > > Ah yes I've found them. They're less suitable to use as an indicator. > > > The tubes in the ones I purchased are identical. There's no part number > and the only marking is "OTK 25". Apparently that means that quality > control inspector number 25 has approved the lamp as military spec. Feel > free to correct me if I'm wrong. > > I still can't figure out what they were used for. Functionally they're > just a box with five momentary sort-of isolated touch switches controlling > a 220V RMS mains load. Cheaper than using mechanical switches? > > > Terry Bowman, KA4HJH > "The Mac Doctor" > > https://www.astarcloseup.com/ > > “...the book said something astonishing, a very big thought. The stars, it > said, were suns but very far away. The Sun was a star but close up.”—Carl > Sagan, "The Backbone Of Night", *Cosmos*, 1980 > > > -- 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+unsubscr...@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/ae09cd57-25c2-408e-9a0c-15f3c9cc5394n%40googlegroups.com.
Re: [neonixie-l] МТХ-90~MTH-90 Keypad from eBay - What is it and how do I hook it up?
I did a quick search and these these things are for sale on Etsy and various other merchant sites I've never heard of. Similar pricing but eBay does give you something resembling a safety net. White plastic with red lenses seems to be the norm. > On Apr 17, 2021, at 5:49 AM, Dekatron42 wrote: > > I had one of these many years ago and if I remember correctly now it is a > resistor of some 100k, or perhaps it was closer to 1Meg, as it just limits > the current flowing in the trigger circuit. You can google these and find > circuits like the ones below: I finally dug a meter out and checked the component marked "M22". Sure enough it's a .22MΩ (220kΩ) resistor. It's connected directly to the touch-sensitive "key" on the front. > On Apr 17, 2021, at 3:21 PM, Yohan Park wrote: > > Ah yes I've found them. They're less suitable to use as an indicator. The tubes in the ones I purchased are identical. There's no part number and the only marking is "OTK 25". Apparently that means that quality control inspector number 25 has approved the lamp as military spec. Feel free to correct me if I'm wrong. I still can't figure out what they were used for. Functionally they're just a box with five momentary sort-of isolated touch switches controlling a 220V RMS mains load. Cheaper than using mechanical switches? Terry Bowman, KA4HJH "The Mac Doctor" https://www.astarcloseup.com/ “...the book said something astonishing, a very big thought. The stars, it said, were suns but very far away. The Sun was a star but close up.”—Carl Sagan, "The Backbone Of Night", Cosmos, 1980 -- 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+unsubscr...@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/7984C3FF-E18C-41F2-B434-AE0F6A691BB0%40gmail.com.
Re: [neonixie-l] МТХ-90~MTH-90 Keypad from eBay - What is it and how do I hook it up?
They are the same thryratron electrically but they have a different top, some come with this evacuation pip at the front and some come with a lens at the front and the evacuation pip at the bottom where the pins exit the glass. /Martin On Saturday, 17 April 2021 at 17:34:17 UTC+2 w...@kitsunegari.net wrote: > There's something odd with the one in this listing: https://ebay.us/8EtaeL > Check the 5th picture (close up of the tubes from the top). > They don't look like MTH-90 since they seem to have a nipple on the top of > the tube (the side facing the lenses). > Also, the bottom part (where the terminals are) is different from an > MTH-90. > So this one seems to use a different type of thyratron but the question > is, which one? > > On Friday, April 16, 2021 at 8:48:38 PM UTC+2 Terry Bowman wrote: > >> >> On Apr 16, 2021, at 1:36 PM, Keith Moore wrote: >> >> Did you get any more information on these? >> >> >> I'm all ears as well. >> >> This seller just put up three BIN listings. They appear to be identical >> (you may have to scroll down the page): >> >> https://www.ebay.com/str/robotube?_trksid=p2047675.l2563 >> >> >> I wish now that I'd bought some of the ones with yellowed plastic. The >> light probably shines through unlike the white ones that are opaque. >> >> >> Terry Bowman, KA4HJH >> "The Mac Doctor" >> >> "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 neonixie-l+unsubscr...@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/928fea87-1826-4825-b754-418d2be0c500n%40googlegroups.com.
Re: [neonixie-l] МТХ-90~MTH-90 Keypad from eBay - What is it and how do I hook it up?
There's something odd with the one in this listing: https://ebay.us/8EtaeL Check the 5th picture (close up of the tubes from the top). They don't look like MTH-90 since they seem to have a nipple on the top of the tube (the side facing the lenses). Also, the bottom part (where the terminals are) is different from an MTH-90. So this one seems to use a different type of thyratron but the question is, which one? On Friday, April 16, 2021 at 8:48:38 PM UTC+2 Terry Bowman wrote: > > On Apr 16, 2021, at 1:36 PM, Keith Moore wrote: > > Did you get any more information on these? > > > I'm all ears as well. > > This seller just put up three BIN listings. They appear to be identical > (you may have to scroll down the page): > > https://www.ebay.com/str/robotube?_trksid=p2047675.l2563 > > > I wish now that I'd bought some of the ones with yellowed plastic. The > light probably shines through unlike the white ones that are opaque. > > > Terry Bowman, KA4HJH > "The Mac Doctor" > > "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 neonixie-l+unsubscr...@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/76ce63bc-2c32-43b2-8290-a72704ed6db3n%40googlegroups.com.
Re: [neonixie-l] МТХ-90~MTH-90 Keypad from eBay - What is it and how do I hook it up?
I had one of these many years ago and if I remember correctly now it is a resistor of some 100k, or perhaps it was closer to 1Meg, as it just limits the current flowing in the trigger circuit. You can google these and find circuits like the ones below: https://tubes-store.com/images/mtx90_02.jpg (I can recommend a high value resistor from 100k and up on the trigger pin so you don't touch any live parts accidentally! It will also protect a little bit if the tube shorts out) http://www.elektronika.lt/schemos/ivairios/61/jutiklinis-jungiklis-su-mtx-90/ (this is a Doorbell, use Google Translate from Lithuanian to English) /Martin On Friday, 16 April 2021 at 20:48:38 UTC+2 Terry Bowman wrote: > > On Apr 16, 2021, at 1:36 PM, Keith Moore wrote: > > Did you get any more information on these? > > > I'm all ears as well. > > This seller just put up three BIN listings. They appear to be identical > (you may have to scroll down the page): > > https://www.ebay.com/str/robotube?_trksid=p2047675.l2563 > > > I wish now that I'd bought some of the ones with yellowed plastic. The > light probably shines through unlike the white ones that are opaque. > > > Terry Bowman, KA4HJH > "The Mac Doctor" > > "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 neonixie-l+unsubscr...@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/a60e1d74-45e0-4d75-bb5c-1a1f95305a1bn%40googlegroups.com.