A capacitor is used at the output of Q2 to block the DC voltage of the particular biasing of the second transistor. The same process is done in the second stage and it provides additional amplification. There is a variable resistor of 20K to adjust the output of Q1, which is then fed to transistor Q2. Transistor Q1 is set up as an NPN transistor and is achieved through a 620K resistor which offers negative feedback for this transistor. A 10K resistor is used to offer the necessary biasing to the microphone. The output of the electret mic is combined by using a capacitor of 100nF, this capacitor helps in eliminating the DC material in the audio transmission. The first stage is a high gain mic preamp circuit and the second stage is a single transistor amplifier to drive the headphones.Įlectret mic is used to send the audio signals in the circuit, these signals are weak therefore they are amplified on the first stage which is a preamp circuit. The 2N4401 transistor is housed in a TO-92 package, which is a small, three-pin. It has a maximum collector current rating of 600 mA and a maximum collector-emitter voltage rating of 40 V. I was studying the function of this simple relaxation oscillator based on a single transistor, 2N4401. It is built around two NPN transistors Q1 and Q2 which are divided into two different stages. 2N4401 is a type of NPN bipolar junction transistor (BJT) that is commonly used in electronic circuits for low-power amplification and switching applications. This circuit is powered by a 9-12V battery. Manufacturer Part No: 2N4401 Package / Case: TO-92 RoHS: Yes Datasheet: Click Here Specifications Current Rating: 0.6A Voltage Rated: 40V Transistor Type.
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