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Radio Shack/Realistic 5 pin mic

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Jun 16, 2013
I haven't been able to find a pin out of the 5 pin midi some of these cbs use. I've got a trc-481 that I keep in my jeep and can no longer stand the channel buttons on the mic. I've got several Motorola microphones laying around and was just thinking I might wire one of those up but I have no reference to stay with.

Sent from my ME173X using Tapatalk


Dec 13, 2007
Mojave Ca
Hello PKY: Look at CBTricks,com they have the diagram for the TRC-481, its at:

Realistic TRC-481 (21-1550)

I would think the 481 Mic uses a low impedance Mic, and is fed a voltage to make it work.

The old Motorola Mic's I have converted for CB use, I removed the Motorola Mic element, unshielded mic cord and PTT switch. Added in new Electret Mic, shielded mic cord, and a real PTT switch from some left over CB Mic. There are many types of Motorola Mic's I am sure you can run down there diagram on the net.

With some experimentation the Motorola Mic Element might be able to work, as its a low impedance Mic and also requires a voltage to operate. It has a transistor that acts as a small gain amp and or a buffer.

Jay in the Mojave
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