Editing BTC foam and foil

{{infobox dswitch
| image name          = Switch recognition--BTC--U mount.svg
| manufacturer        = [[BTC]]
| product code        = 
| switch type         = Linear, tactile
| actuation force     =
| introduced          = 
| discontinued        = 
| keycap mount        = [[Cherry MX mount]]<br>Key Tronic or similar
| contact mechanism   = [[Contact mechanism#Capacitive|Capacitive]]
}}

'''BTC foam and foil''' is a [[foam and foil]] switch from [[BTC]].

==Description==
As the capacitive mechanism provides no force, a spring or [[buckling rubber sleeve]] is placed under the [[keycap]]. BTC keyboards are generally readily identifiable by the rear label and the use of a 1.25 unit escape key. However, the discrete foam and foil modules are (typically, if not always) BTC branded on the top.

==Variants==
===Force curve===
Bothy linear and tactile versions exist. As with [[Key Tronic foam and foil]], the linear version uses a helical spring under the keycap, while the tactile version uses a buckling rubber sleeve.

===Keycap mount===
These switches are most commonly found with [[Cherry MX mount]] sliders, but Key Tronic–shape sliders were also used.<ref name="GH-5060AT" /> Whether these sliders are compatible with Key Tronic keycaps is not confirmed. The Cherry MX mount sliders are externally identical to those of the more common [[BTC dome with slider]] switch.

===Switch mount===
Some BTC foam and foil keyboards use discrete slider modules along with a mounting plate, while others have the slider guide shafts moulded into the top case.

===Colour===
The sliders come in various colours including white, pink, and cyan.<ref name="eBay-5369" /> At least two slider colours may be found within the same keyboard, distributed at random.<ref name="DT-5060-SE" />

==Keyboards==
*[[BTC 53 series]] (linear and tactile; Cherry MX mount)
*[[BTC 5060]] (linear; Cherry MX and Key Tronic–like/compatible mount)
*[[BTC 5100]] (tactile; Cherry MX mount)
*[[BTC 5151]] (linear; Key Tronic–like/compatible mount)

==Gallery==
===Discrete===
The [[BTC 5151]] PCB has exposed pads, so the foam discs in theory will be insulated. This is a linear example with helical springs.

<gallery widths=250 heights=167>
File:BTC_5151_PCB_top.jpg                          | Circuit board top, with exposed pads
File:BTC_5151_top_of_key_switch_with_spring.jpg    | Top of key switch with spring 
File:BTC_5151_foam_and_foil_is_still_pristine!.jpg | Switch module viewed from below, showing the foam pads and foil discs
File:BTC_5151_key_switch_with_spring_removed.jpg   | Switch with spring removed
File:BTC_5151_Keytronic_style_key_caps.jpg         | Keycap mount, keycap aspect
</gallery>

The [[BTC 5060]] PCB does however have solder mask over the pads. The design of the slider modules is different to those in the BTC 5151.

<gallery widths=250 heights=187>
File:BTC-5060-PCB-Detail.JPG        | Sense pads on the PCB are covered with solder mask, insulating them
File:BTC-5060-Foil-Pads-Detail.JPG ‎ | Foil discs
File:BTC-5060-Switch-Components.JPG | Switch components
</gallery>

===Non-discrete===
The following pictures are from a [[BTC 5100]]. This example is tactile and uses buckling rubber sleeves.

<gallery widths=250 heights=187>
File:BTC 5100 -- sliders and sleeves.jpg | Sliders with [[buckling rubber sleeve]]s
File:BTC 5100 -- sliders with foil.jpg   | Sliders with foil layers
File:BTC 5100 -- slider detail.jpg       | Slider detail
File:BTC 5100 -- PCB (top).jpg           | Top of PCB with capacitive pads
</gallery>

==References==
<references>
<ref name="eBay-5369">Telcontar.net — [http://telcontar.net/KBK/KBref/#BTC-5369 Keyboard reference photos]</ref>
<ref name="GH-5060AT">Geekhack — [http://geekhack.org/index.php?topic=62760.0 Blue Chip BTC-5060 vs non-branded version?] Posted 2014-09-13. Retrieved 2015-07-23.</ref>
<ref name="DT-5060-SE">Deskthority — [http://deskthority.net/group-buys-f50/nib-btc-keyboards-t8698-30.html NIB BTC Keyboards {{sq|Swedish doubleshots - MX compatible}}]</ref>
</references>

[[Category:BTC switches]]
[[Category:Foam and foil switches]]
[[Category:Linear switches]]
[[Category:Tactile switches]]
[[Category:Keyboard switches with Cherry MX mount]]
[[Category:List of all keyboard switches]]