Re: [neonixie-l] МТХ-90~MTH-90 Keypad from eBay - What is it and how do I hook it up?

[Yuriy Ovchinnikov]

If anyone is interested, then I have 50 pcs. MTX-90.

вс, 18 апр. 2021 г. в 05:23, Yohan Park :

> 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
>>
>>
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[neonixie-l] Re: 228-B2 IN-14 Modular panel mount display clock

[newxito]

I really like the combination of these nice old boards with the Arduino! 

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