One of the things that slightly bothers me about this calc (I’ve not got one but I can read) is the use of dome/dimple switches .....
Was there a particular reason why, say , low profile surface mount tact switches weren’t used instead ?
buttons that don't register well
Re: buttons that don't register well
The decision has been made, obviously, but how noisy were they? What kind of switches were considered?
I believe in free will. Just can't help it.
Re: buttons that don't register well
I tried many different kinds. They all were too noisy, NG for use in a library or during a test.
All have some dome inside, the diameter and the thickness of the dome affect how they sound and the force needed to press it.
The current domes are 9mm in diameter and I haven't found any low profile tact switch with a dome larger than 6mm.
But please make a suggestion for a better switch. I'm very curious.
Re: buttons that don't register well
Valid point!
Alas, I don't have expertise in this area. As I have pointed out elsewhere, I am fully aware that I am nitpicking. Well, partly so - there are obviously some reports of button misbehaviour / inconsistencies, which should not happen (my ENTER key is mushy on the left side, and there are other reports). The nitpicking part is that I would personally prefer a bit softer feel - like the best HP's. How did they manage it?
I believe in free will. Just can't help it.
Re: buttons that don't register well
Yes of course they are dome too inside.All have some dome inside
but I wouldn't call them noisy per se... and you can specify operating pressure from quite a few suppliers toothe diameter and the thickness of the dome affect how they sound and the force needed to press it.
Here for example:
https://docs-emea.rs-online.com/webdocs ... 4b0fc9.pdf
Supplied in three different operating force versions
ALPS, Wurth do plenty too
Here's an ALPS, version that comes in four different operating force options
https://docs-emea.rs-online.com/webdocs ... 4b0fb3.pdf
Depends on how much clearance from top of the switch to the bottom of the button you have got ?
I have some surface mount dome switches here that you can't really hear, the dome is more or less exposed (Kapton film over the top) but on it's own substrate.
The main benefit I can see is ease of replacement
Re: buttons that don't register well
As mentioned, the force needed on the domes depends on their thickness.
Then the plastic hinge of each button adds up too to the total force needed.
The thinner the domes and the hinges are, the more likely they'll break.
Current domes need 150gr force, I'll try 120gr ...
Re: buttons that don't register well
Wow, good news (for me, at least)! I'd be happy to test them...Michael wrote: ↑Thu Apr 05, 2018 11:21 amAs mentioned, the force needed on the domes depends on their thickness.
Then the plastic hinge of each button adds up too to the total force needed.
The thinner the domes and the hinges are, the more likely they'll break.
Current domes need 150gr force, I'll try 120gr ...
I believe in free will. Just can't help it.
Re: buttons that don't register well
It depends a lot on how everything is put together. Of course the switch is on a PCB in the end, but try putting a single one on a wooden surface and press the dome with something hard.
Re: buttons that don't register well
I agree
But a (thin foam etc) sheet could be added to damp down any excess noise of operation perhaps.
But a (thin foam etc) sheet could be added to damp down any excess noise of operation perhaps.