Sometimes you need a simple to make microphone amplifier for your radio equipment <schematic here>.
The most easy to made version is that on the left side of the drawing. When the sound out of this amplifier is a bit to high in frequency, you can ad a resistor of 1K in combination with a 1nF condensator as shown on the right side of the drawing.
For an audio amplifier I always use a LM386. The schematic of it is also shown on the drawing.
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