Editing Sasse series 25

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{{TODO challenge|goal=Find out about the apparent [[Hall effect]] version}}
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{{Infobox dswitch
|image name         = Sasse SPST-A2 -- top.jpg
| manufacturer      = [[Sasse]]
| product code      = 
| introduced        = 
| discontinued      = 
| switch type       = [[Linear]], [[tactile]]
| clicky            = 
| contact mechanism = [[Metal leaf]], [[Hall effect]]?
| actuation force   = 
| lifetime          = 20M
| tactile force     = 
| pretravel         = 
| travel            = 2.5 mm, 4 mm
| keycap mount      = [[RAFI mount]]
| switch mount      = [[PCB mount]]
| patents           = 
}}

'''Sasse series 25''' (Baureihe 25) is a series of [[PCB mount]] keyboard switches from [[Sasse]].

==Description==
This switch is compatible with [[Siemens STB]] and [[RAFI RS 76 M]]. [[Sasse]] produced keyboards with this switch underneath [[Siemens]] caps (see below). The same combination has been used for the [[Tiki 100]] computer. The designation '''Sasse 200MN''' has been copied from the Tiki hardware manual.<ref name="Tiki" />

Brief details of series 25 were listed on an older version of Sasse's website. The link to this older website was still present on the 7th of June 2003, and had been removed by the 19th of July that year. The last archived copy of the series 25 page was captured on the 2nd of November, and the replacement website no longer included individual keyswitches. The Sasse website depicted these switches both with dual terminals and quad terminals, and the quad terminal version appears to contain a Hall sensor IC (not mentioned in the page text). It appears that a Hall effect sub-series existed.

The switches are designed for a 19.05 × 19.05 mm grid.

==Variants==
Options included:

*One or two LEDs
*"Resistance diode" (in German, Sperrdiode)
*Tactile (German, Druckpunkt) and linear
*Nine different contact arrangements, including momentary and changeover (German, Umschaltkontakten)

Three observed variants are given below, with codenames standing in for the part numbers.

{| class="wikitable"
|-
! Codename   !! Branding !! Mount                 !! Slider colour !! Slide block colour
|-
| A1         || ?        || RAFI-like/M8          || Black         || ?
|-
| A2 (200MN) || None     || RAFI-like/M8          || Black         || Grey
|-
| B1         || Sasse    || RAFI-like/proprietary || Cream         || Black
|-
| B2         || Sasse    || RAFI-like/proprietary || Red           || Grey
|}

==Keyboards==
*[[Sasse]] "Kundenspezifisch erweiterte alphanumerische Tastatur"<ref name="iF11443" />
*[[Sasse]] "Baureihe 50"<ref name="iF15563" />
*[[Tiki 100]] (200MN)

==Gallery==
===200MN===
Combination RAFI-like/Cherry M8-like keycap mount with stabiliser wire support; uses a black slider and grey slide block. The Tiki 100 uses these switches, and the technical manual cites them as 200MN, so this is assumed to be the part number.

<gallery widths=250 heights=187>
File:Sasse SPST-A2 -- top.jpg                        | Top
File:Sasse SPST-A2 -- jumper partially removed.jpg   | Jumper partially removed
File:Sasse SPST-A2 -- disassembled, top views.jpg    | Full disassembly, top views
File:Sasse SPST-A2 -- disassembled, bottom views.jpg | Full disassembly, bottom views
</gallery>

==References==
<references>
<ref name="Tiki">djupdal.org — [http://www.djupdal.org/tiki/tekniskedok/ TIKI-100 teknisk info] → Kontiki-100 Teknisk Beskrivelse Rev.C'', 1984, S.3.20</ref>
<ref name="iF11443">iF Design — [http://ifworlddesignguide.com/entry/11443-kundenspezifisch-erweiterte-alphanumerische-tastatur/ Award 1981]. Retrieved 2017-04-10.</ref>
<ref name="iF15563">iF Design — Awards [http://ifworlddesignguide.com/entry/15563-alphanumerische-tastatur-baureihe-50-aktiv-ii/ 1982] and [http://ifworlddesignguide.com/entry/14470-alphanumerische-tastatur-baureihe-50-aktiv-ii-1983/ 1983]. Retrieved 2017-04-10.</ref>
</references>

==External links==
*Flickr — [https://www.flickr.com/photos/triplehaata/sets/72157642282157173 "B1" and "B2" variants]
*Internet Archive Wayback Machine — [http://web.archive.org/web/20031102052017/http://www.sasse-elektronik.de/produkte.tasten.tastatur-e.html Keyboard Keys] (2003-11-02 capture)

[[Category:Keyboard switches with a RAFI mount]]
[[Category:Linear switches]]
[[Category:Tactile switches]]
[[Category:Metal contact switches]]
[[Category:Sasse switches]]
[[Category:List of all keyboard switches]]