Re: show your mic

Howard Fidel

I use the Retevis mic. Under $7 on eBay. I cut off the connector and rewired it to the phono jack. Despite what others have said about the wire colors, I found Red it the mic, Black is ground, green is PTT.

Howard WB2VXW

On 4/23/2018 8:07 PM, Jack Purdum via Groups.Io 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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