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2. Public address system - Wikipedia

   en.wikipedia.org/wiki/Public_address_system

   Portable PA systems that could be plugged into wall sockets appeared in the early 1930s, when the introduction of electrolytic capacitors and rectifier tubes enabled economical built-in power supplies that could plug into wall outlets. Previously, amplifiers required heavy multiple battery packs. [15]

3. Guitar amplifier - Wikipedia

   en.wikipedia.org/wiki/Guitar_amplifier

   Guitar amplifier. A guitar amplifier (or amp) is an electronic device or system that strengthens the electrical signal from a pickup on an electric guitar, bass guitar, or acoustic guitar so that it can produce sound through one or more loudspeakers, which are typically housed in a wooden cabinet. A guitar amplifier may be a standalone wood or ...

4. List of loudspeaker manufacturers - Wikipedia

   en.wikipedia.org/wiki/List_of_loudspeaker...

   Adamson Systems Engineering: Canada Advent: United States Ahuja: India Alesis: United States Altec Lansing: United States Amphion Loudspeakers: Finland Armstrong Audio: United Kingdom Audiovox: United States Audison: Italy Auro-3D: Belgium Bang & Olufsen: Denmark Barefoot Sound: United States BassBoss: United States Behringer: Germany Blaupunkt ...

5. Personal digital assistant - Wikipedia

   en.wikipedia.org/wiki/Personal_digital_assistant

   The Palm TX. A personal digital assistant (PDA) is a multi-purpose mobile device which functions as a personal information manager. Following a boom in the 1990's and 2000's, PDA's were mostly displaced by the widespread adoption of more highly capable smartphones, in particular those based on iOS and Android in the late 2000's, and thus saw a rapid decline.

6. Watkins Electric Music - Wikipedia

   en.wikipedia.org/wiki/Watkins_Electric_Music

   Watkins Electric Music was one of the first to manufacture and sell guitar amplifiers in England, introducing the Watkins Westminster in 1954, followed up by the V-fronted Dominator. [1] In 1958, Watkins Electric Music introduced the Copicat, one of the first-ever portable tape echo units. The shop sold the entire first production run of 100 ...

7. Portable appliance testing - Wikipedia

   en.wikipedia.org/wiki/Portable_appliance_testing

   Portable appliance testing. A common label for certifying that a device has been tested. In electrical safety testing, portable appliance testing ( PAT, PAT inspection or PAT testing) is a process by which electrical appliances are routinely checked for safety, commonly used in the United Kingdom, Ireland, New Zealand and Australia. The formal ...