We’re talking of course about the carbon microphone amplifier, a piece of telephone technology which made its way into consumer electronics. The carbon microphone is a container of loosely ...

Condenser microphones built in this way can be extremely high quality, but come at the expense of needing a high voltage power supply to supply the charge and an amplifier to buffer and magnify ...

Matthew Ginsberg, 42, organised an event last November and admitted taking a microphone and amplifier to a demonstration on Llandudno Promenade. But Ginsberg, from Bethel in Gwynedd, said he took ...