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[KC8UNF]

I am building a speech processor kit that requires  an electret condenser mic. I would like to convert it to a dynamic type of mic (500-600 ohm). What do I need to do this?

[WB2WIK]

I'd want to see the circuit diagram before answering this.  

In some cases, all you'd need to do is remove the mike bias resistor and replace it with a nonpolar capacitor; although you may have to add another gain stage, or modify the gain of the existing stage.  Can't tell without the diagram.

WB2WIK/6