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 [...]
These are many pre tone control circuit, use transistors as main. so low noise,good sound, cheap and easy to buy parts, you can builds with PCB layouts
This is low noise tone control circuit using 4558 or NE55532, easy make with one PCB layout board, can adjust bass treble mid volume,also use to microphone.
This is Low noise microphone preamplifier circuit using IC-NE5532, M5218P. Simple circuits but high quality balance-Unbalance Input for dynamic microphone
We will use Class A headphone amplifier circuit that is very good quality sound. Consists low noise Op Amp ICs and 2 transistor as main so have very cheap [...]
The bridge adapter circuit using NE5534 low noise IC to convert normal stereo to high power mono amplifier about 4 times,watt power lost approximately 75%