On Mon, Apr 23, 2018 at 4:07 PM, Dexter N Muir <dexy@...> wrote:
Carbon mics need a bit more bias current. Most can be revived by physical shock, breaking up clumps of granules packed by gravity in storage/disuse.
Challenge: the carbon mic that got me into electronics and eventually Ham Radio, some 60-odd years ago! Take a (sorta fist-size to shoe-box) cardboard box lid. Take 2 razor blades (single-sided are best)with wires attached. Poke those blades up through the box-lid beside each other, (just) not touching. A twist of the insulated wires might help steady them. Take a section of pencil-lead and balance that across the blade edges. Connect up - you've got a mic!
