What microphone recommendations for maestro?

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I have seen a couple of threads on this topic and am still a little confused. I am not familiar with wiring standards such as TRRS and TRS etc... so please keep this in mind when reading the rest of the post. I wound up ordering the connector for my hand mic that came with the flex 6500 but frankly... I think it leaves a great deal to be desired and so I am now in the process of looking for other microphone options for my Maestro. I have an old dynamic microphone with a 1/4 mono plug and an on and off switch. My plan was to use the supplied adapter with the Maestro on vox and use the on and off switch as a key.. When i did this, the rig went into immediate transmit. So I figured the adapter was wrong. Can anyone explain to me in simple terms what kind of adapter I would need for this dynamic microphone OR make specific recommendations on a microphone connection for the mic1 or mic2 inputs other than the FHM-1 hand mic and adapter? I am sure I can do better. I am just not understanding something here. Why flex did not include a usb port for a mic I will never know. That would have been convenient for me. What are my options here (without having to get out the soldering iron! LOL) Thanks everyone. Tony (KC2DIS)
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Tony C kc2dis

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Posted 3 years ago

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EA4GLI - 8P9EH - Salvador

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I find having a hand mic convenient with the Maestro.

My solution was to improve the Flex hand mic by replacing the dynamic element with an electret element.

I bought the electret element on ebay http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItemVersion&item=152019599810&view=all&tid=1430...

Pack of 10 so I can use them for other projects. I wanted a 600ohm element but couldn't find it so I had to do with this high ohm valued ones.

Then all you need is a small resistor and a capacitor.

The Flex microphone is slightly different, the + and - for the MIC are very close to the switch instead of on the side like in the above picture. The 5v is in the same pin as in the pic above. I tested it just to make sure. 

This diagram explains it better.

I used different values for the resistor and the capacitor. Resistor I found the closest one to 8.2k in my spare parts box and for the capacitor I used a 100nF which worked better with my voice and the eBay electret element.

I also put 2 electret elements in parallel to increase gain.

It works great!! It takes 5 minutes to do and you might even have the parts laying around.