Re: show your mic

Paul Schumacher

was it yellow?


On Monday, April 23, 2018, 5:08:09 PM PDT, Jack Purdum via Groups.Io <jjpurdum@...> wrote:

Back when I was in school, I once wrote an essay with a manual graphite display generator.

Jack, W8TEE

On Monday, April 23, 2018, 7:01:26 PM EDT, William Cullison <wa8vih@...> wrote:

I made one from two carbon blocks, in a vertical configuration, with a dimpled area and a pencil sharpened at both ends.

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!


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