Icom IC-7000 Modification Instruction page 3

The pieces withdrawn from the microphone hand. The
electret capsule and SMD capacitor.
Detail of thickness of this capsule.
This circuit what we can do with a pcb assay due to its simplicity. Then presenting an diagram of this microphone
preamplifier extremely easy to construction:
BF in
GND
Rear View from the original capsule.
BF out