As said above, this scheme there are no transistors or components “analog” to ensure amplification of the signal from the microphone. Except for only two logic gates share the work. Microphones, which are provided to capture the sound,
connected to the input of the first logic gate U1: A. This ensures that the amplifier logic gate rate is determined by the value of the resistors R1 and R2. The second logic gate U1: B, in turn, ensures that amplification can be adjusted using potentiometer RV1.
Note: The microphone must be magnetic low impedance (50 ohms and 600 ohms). If your microphone electret type with two legs or three legs, you need to add resistance to power.
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