Double-Button Carbon Microphone Works Hula-Cow Style Model do druku 3D

This is the entire body assembly of a 1930s/1940s double-button carbon microphone (It CAN be used as a single-button mic as well)

NOTE: YOU WILL need to build the circuit for this mic! It requires a 9V battery, and power. Instructions/build here:
https://www.youtube.com/watch?v=8nSSCG2xCac

You will need to supply the carbon (crushed, strained, CONDUCTIVE*, carbon pellets for fish tanks works fine, so long as you get granules of consistent size), the screws for the terminals and to hold the mic together, and the diaphragm material.

Assembly tools: Screwdriver, soldering iron, hot glue gun, Ohmmeter or multitester.
Circuit components: 100K Resistor, 900 ohm resistors (x2). 10uF capacitors (x2), XLR plug, Wire.

This is an original design based off of the vintage mics. This one works well and has the hula-cow mascot from our studio on it.

There's another, more fiddly model that's a direct copy of the old mics, as well, but that's a different download.