General > General Technical Chat
Is there a "standard" way to convert switch operation?
Neomys Sapiens:
According to IEC, the term for 'Wischkontakt' is 'passing make contact'. Maybe 'impulse contact' would be the term more often practically used.
@Fred Basset: as you may have noted, I did not hold it against you or declared it as wrong, but. as I wrote, as not in line with the standard usage. Would I not be intimately familiar with those terms both in standards and in industrial practice, I might have chosen the same wording.
But as you can easily see from the commerial offerings, momentary action pushbuttons are manyfold, and the functionality described is not met by them.
Fred Basset:
I used to buy small switches with a "hat". They were sold as "ordinary" momentary contact switches at most electronic supply stores. I breadboarded them, and using an LED, you got close to a 0.25 second closure of the contacts, irrespecive of how long I held in the button, or released it quickly. They were useful for producing pulses for 4000 series and 74 series ICs. They were often used for that very purpose becuase of that property.
Maybe it is difference in language? Since two of you now are saying the same thing, maybe there is a difference between our countries in the meaning of momentary then? What you are describing would have been known in my country as non-latching on/off push switches.
capt bullshot:
--- Quote from: Fred Basset on July 10, 2020, 01:38:11 pm ---I used to buy small switches with a "hat". They were sold as "ordinary" momentary contact switches at most electronic supply stores. I breadboarded them, and using an LED, you got close to a 0.25 second closure of the contacts, irrespecive of how long I held in the button, or released it quickly. They were useful for producing pulses for 4000 series and 74 series ICs. They were often used for that very purpose becuase of that property.
--- End quote ---
That's an interesting kind of switch. Never seen one, and never heard of that. There must be some spring action inside, similar what Neomys called the "Wischkontakt", though the ones I knew had a slightly different action.
Don't know any term for what you describe, neither German nor English. Anyway, the big mighty internet explains "momentary switch" as a push button that closes or opens a circuit as long as you press it - that's what I did understand in the first place.
tooki:
--- Quote from: Fred Basset on July 10, 2020, 01:38:11 pm ---I used to buy small switches with a "hat". They were sold as "ordinary" momentary contact switches at most electronic supply stores. I breadboarded them, and using an LED, you got close to a 0.25 second closure of the contacts, irrespecive of how long I held in the button, or released it quickly. They were useful for producing pulses for 4000 series and 74 series ICs. They were often used for that very purpose becuase of that property.
Maybe it is difference in language? Since two of you now are saying the same thing, maybe there is a difference between our countries in the meaning of momentary then? What you are describing would have been known in my country as non-latching on/off push switches.
--- End quote ---
Nope. I’m American, and as a kid I shopped for parts at radio shack, where they were called momentary switches. For example, look at page 133 of the 1990 radio shack catalog: https://worldradiohistory.com/Archive-Catalogs/Radio-Shack/Radio-Shack-1990.pdf
I’m not sure where you got your terminology, but your private vocabulary doesn’t agree with standard usage. Non-latching is certainly understandable, but everyone understands “momentary” to mean the same thing as that. Pushbutton pulse generating switches I’ve never heard of (other than piezo buttons).
Benta:
The Schadow, or now C&K F-series all work the same way. I attach a drawing from the datasheet to explain what I mean.
The basic F-switch has a push-on, push off function.
If you remove the small clip shown in red, it turns into a momentary switch.
If you want "radio button" functionality, you need the U-profile mount, plus the related "release bar" with leaf spring. This provides a different latching function through a slot in the switch, blue in the picture.
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