bill555 wrote:...and become generally familiar with at least the main types (3, basically: dynamic, condenser, and ribbon)
Donning the pedant hat again, just to avoid potential confusion... a ribbon mic _
is_ a dynamic mic, and strictly speaking there are only
two 'main types' in common use, each with two sub-types.
Most mics can be categorised as either
electro-magnetic or
electro-static, these being the two basic electrical operating principles -- at least as far as typical studio mics are concerned. There are other technologies, of course, like piezo, optical, microflown, Mems, and others... but they tend to be used in more specialised applications. (Piezo is commonly used in contact mics, as used on acoustic guitars etc).
The
electro-magnetic type of microphone generates an output voltage by using the sound waves to move a conductor within a magnetic field. The
electro-static type uses sound waves to move a conductor within an electrostatic field, varying the capacitance of the mic capsule, and an impedance-converter circuit uses that to generate an audio output voltage.
For the sub-types, electro-magnetic mics can be either
moving-coil (often referred to as dynamic) or
ribbon.
And electro-static mics can be either
capacitor (condenser) or (back-)
electret.
Capacitor (condenser) mics are either DC-biased or RF-biased by external circuitry, while electrets are permanently biased by an internal substrate.
All electro-static mics require active impedance-conversion circuitry, so they all need to be powered in one way or another.
Some electro-magnetic mics also now incorporate active buffer amplifiers so may need powering too.