The Hi Fi preamplifier circuit project to tune smooth bass-treble, with a very low distortion. Use low noise transistors Frequency response range 20Hz-20KHz [...]
Want very high impedance preamplifier? We may have many circuits to do. But the FET Preamplifier circuit might be good choice. Because of small, easy, and cheap.
Want a high impedance preamplifier circuit? For a ceramic record player, etc. Make the emitter follower circuit has low noise causes sound concise.
Try medium Impedance Preamplifier circuit using only one transistor. Use a common emitter. Have a lot of circuits use this. try it and learn with fun.
Make the easiest Low impedance input preamplifier circuit using transistor and a few components. With PCB layout and how to reduce hum and low noise output.