It is easist for mics with electret capsules. Even easier if the electrets have their FETs build it.
I've "chopped" a few mics:
AT822. Electret capsules with built in FET. I just chopped off the head, inserted a cord and two 4.7k resistors in there. Connect to Edirol R09 with a miniplug, and works great on plug in power.
AT3021. Electret capsule, without FET. I just put a FET from a TSB-120A capsule behind, added a 4.7k resistor and fixed the back with epoxy putty.
Yes, anything is possible with too much motivation and too little inhibition
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Richard