Option of purchasing a 4-pin or 5-pin Mic Plug wired for specific radios listed on the back of the package.

It was pre-wired for Uniden and Cobra radios that used a 4-pin jack.

A separate package of this same Microphone was also made with a 5-pin plug wired for radios the required separate RX/TX Switching that was not tied to ground at the Microphone.

Cobras' CA-series including the CA-75 Specific:
Either the 4-pin model or the 5-pin model, both had the same type of cord and had 5 wires - Red for Audio, Blue for Receive, Black for Transmit. White was tied to Shield for common, Chassis and Battery ground on 4-pin mikes, while White was common for switching for 5-pin radios and the Shield was to Chassis and battery ground - providing Audio return ground separate from the common terminal for RX and TX.

However, as with any product, solely relying on this color-code information is not reliable. Changes and different manufacturers were used as the years progressed for this model - so color coding and actual value of the components listed may be different.

They designed the PCB with a 4-pole, Dual-Throw, Spring return switch for the PTT [4PDT] with one set of contacts unused allowing for extended levels of relay and switch control if the end user had the proper cord and plug to use. The Grommet that acts as a strain relief used a simple crimp and could be removed and reset to handle other cords that had extra wires.

In later model years, the Cobra and Uniden models that required a 5-pin plug were consolidated into straight 4-pin standard design. This occured in the years of 2002 to 2004 when older radios stock was depleted and they no longer offered the older platform radios.

Subsequently, a third-party market for 4-pin radio Microphones allowed for other companies to sell this Microphone under various brands - some listed above. This also changed the color coding of the Mike Cords, some cords follow RJ color coding as if they are using 4-wire phone cord, while others went to 3-wire with different color coding - only shield being the 4-th wire being common.

The main purpose of this project is to help others that needed a Schematic and Wiring diagram for this Microphone. I also have a trick or two you can do this Circuit Design to improve the performance and level sensitivity, and hopefully, you're enjoyment.

To continue, you can go on to the next page which contains the Schematic, Component layout and list, and Mic wiring guide.

Note to Modem-based USERS!:

• The next page contains a large graphic and if you are on a s..l.o.o.o.o.o..w.... connection - it may take a while to load - please be patient!

Disclaimer: Although the greatest care has been taken while compiling these documents,

we cannot guarantee that the instructions will work on every radio presented.