Dynamic mic for YAESU FT-7800R

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fjpompeo

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How do I use a dynamic microphone with my YAESU FT-7800R.
I have tried to connect the mic direct to the radio but the sound is too low.

73,

Fernando - PU2PLL
 

I would guess the original mic is an electret which has much higher output for a given sound presure level. You need an extra stage of amplification of ~10 times which you should be able to do with a single transistor or IC stage. The good news is the mic socket carries a stabilized 9V on it so you have power available for the amp.

Brian.
 

Microphone Impedance: 2 K Ohm No spec for input level.
What mic impedance is yours?

If your sensitivity is too low, do you want to make or buy a preamp or match impedances?
 
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