rlhar...@oplink.net wrote: > On 2019.04.08 05:29, Martin wrote: > > since a few days, my qq(´) and qq(´)¹ don't work with a single > > press. I have to press twice. > > The problem most likely is oxidation of the electrical contacts of the key > switch. The silver or gold plating of the contact surfaces may be > compromised by mechanical wear. > > Back in the 1970's, keyswitches were rated in terms of tens of millions or > hundreds of millions of keystrokes; keyswitches of today are rated in terms > of tens of thousands or hundreds of thousands of keystrokes. Search and > read the manufacturer specification sheets for keyswitches.
IBM Buckling Spring: nobody knows, but there are a lot of keyboards still working 25-30 years later. Cherry: 50 million. https://www.cherrymx.de/_Resources/Persistent/e005dff11a2e406babe9e8718fec9fc8835bb9ce/EN_CHERRY_MX_BLUE_RGB.pdf Kailh: 50 - 80 million. http://www.kailh.com/en/Products/Mechanical_keyboard_switch/165.html Matias ALPS: 50 million. http://matias.ca/switches/click/ Gaterons may be as low as 20 million. You can buy all of the above today, in keyboards ranging from about $60 to $450. -dsr-
