The 2SK2837, 2SK-2837, K2837, 2837 is a 500V 20A N Channel Silicon Field Effect Transistor Or MOFET TO-3PN-3 Package. Chopper Regulator, DC−DC Converter and Motor Drive.
The MT8870 DTMF Audio/Speech Decoding Telephone Module is commonly used to control robots with a mobile phone, it is also used in different kinds of home automation projects where mobile dial pad input is required.