There are a large number of radio amateurs on the air with a poor-quality signal. This is regardless of the country…
I On the radio, I always say that the microphone is the basis of the signal, the better it is, the better your signal and its frequency response on the radio.
This article is about how to make a quality microphone for ESSB quality from a simple karaoke microphone.
From a microphone for karaoke, we only need a body. In this case, we will make the circuit that I will present to you.
It is advisable to find a microphone made entirely of metal, not plastic… This is very important to reduce hum and hum.

THE MYSTERY OF THIS CIRCUIT IS THE USE OF TWO ELECTRET CAPSULES
By using two capsules, I improve the frequency response and reduce microphone noise.
This is my modified Behringer microphone circuit.

Now, according to the NP scheme, these are not polar capacitors, if there are problems and you don’t have them, then by connecting two electrolytes in series with 10 microfarads each. you will get a non-polar capacitor of 5 microfarads. Connect plus to plus. The picture is attached.
Transistor SS9014, aka 22SC9014, aka KTC9014C
If you do not find 2SA1370, you can install 2SA1360, 2SA1540 without deterioration
Trimmer R1 to adjust the sensitivity of the microphone.
Chokes DR1 and DR2 are required, the diagram shows a choke. To reduce interference from RF.
Capacitors it is desirable to put an Audio Capacitor (film axial capacitors)

I used 54E0 JAPAN capsules from SENAO 258 radio extenders, BUT ANYONE WILL WORK.

The recording and operation of this microphone circuit is attached.

The advantage of this radio microphone circuit is low price, high signal quality and low noise figure.
By picking up a couple of capsules, you can get the perfect sound of your radio on the air.

BY APPLYING THE SCHEME WITH 4 CAPSULES, I GOT A BETTER AND BETTER SIGNAL IN THE RADIO AIR!