This is a simple audio Pre-Amplifier with single transistor 2N3904.
This easy circuit provides good gain to weak audio signals such as electret microphone. Use it in front of an RF oscillator to make an RF transmitter that’s very sensitive to sound.
This circuit should be perfect for dynamic microphone…
Dynamic microphones are versatile and ideal for general-purpose use. They use a simple design with few moving parts. They are relatively sturdy and resilient to rough handling. They are also better suited to handling high volume levels, such as from certain musical instruments or amplifiers. They have no internal amplifier and do not require batteries or external power.
This is a low noise and distortion pre-amplifier and tone control circuit in one module. Using a special IC TDA1524A, this simple circuit is easy to build and will drive most of power amplifier.
Component:
Resistors: R1, R2__________________ 220R R3, R4__________________ 4K7 R5______________________ 2K2 R6______________________ 1K Capacitors: C1, 2, 7, 8, 17_________ 10 uF ecap C3, 4___________________ 47 nF C5, 6___________________ 15 nF C9______________________ 220 nF poly C10_____________________ 100 uF 25V C11, 12, 13, 14, 16_____ 100 nF C15_____________________ 1000 uF 35V C18, 19_________________ 10 nF Misc.: IC1_____________________ TDA 1524A IC2_____________________ LM 7812 P1______________________ 50k linear switch pot P2, 3, 4________________ 50k linear pot X1, 2, 3, 4_____________ RCA jack D1______________________ Diode 1N4004 L1______________________ Red LED
This is a HiFi pre-amplifier circuit diagram with low noise output. Very wide range frequency from about 10Hz until up to 100Khz will be gained by this preamplifier for maximum audio performance.
