11/18/2023 0 Comments 4. pn2222 transistorWe gathered every component and made it on the breadboard like in the image shown below. Although the circuit has option for three input channels, but here only two individual signals are provided. To test the circuit we used an Audio amplifier and connected it across the output. Check here various Audio Amplifier Circuits. For additional amplification, other external amplifiers can be connected across the circuit. We can listen mixed audio signal directly if we connect low power headphone across the. 100uF, 16V Electrolytic capacitor is added for smooth DC supply and decoupling. 22uF is used to block the DC and only allowing amplified AC signal. Resistor R2 (3.9k) is used to provide the necessary collector current required for amplification purpose, and the output ceramic capacitor of. For biasing the PN2222A transistor 2.2M resistor is used along with 470pF ceramic capacitor. Limiting resistors 4.7k R3, R4, and R5 are essential to mix three signals perfectly. The input capacitors are blocking any DC signal coming from the signal source and only allowing the AC to pass. Here the transistor is amplifying three inputs which are available across the collector. We are powering the circuit using a 12V DC power supply unit. The other components are connected across the base of the transistor. The emitter is connected with GND and the collector is connected with a 3.9k resistor. In this Audio Mixer circuit, transistor 2N2222A is the heart of the circuit. This transistor has 500mA of collector current and can be used for medium power amplification purposes. PN2222A is an NPN Silicon transistor, widely used in general purpose electronics. Different transistor with the same ratings can also be used with this circuit like 2N3904. Below is the pin diagram of a PN2222A transistor. 1uF ceramic disc capacitor (one for each input channel) 2 or more 4.7k resistor (one for each input channel).In this circuit, two audio inputs will be mixed using a single transistor to produce a mixed audio output. In this project, we will make Audio mixer using a single transistor which will combine two or more audio signals and produce a combined audio output. It is a widely used process in Live concerts, televisions, films, music industries etc. The audio mixer uses audio mixing process where multiple sounds are combined to form a single or multi-sound. The mixer mixes two or more audio signals into a one (Mono) or two output (Stereo). Audio Mixer is an essential device in Audio Electronics.
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