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This is a simple Pre-Amplifier Circuit Diagram . This simple circuit contribute best gain to weak audio signals. use it in front of an RF oscillator to make an RF transmitter that is very sensitive to sound. Best Pre-Amplifier Circuit Diagram

Circuit Diagram Description Here is the circuit diagram of three input microphone preamplifier. This is a mic mixer preamplifier centered on the high gain operational amplifier IC LM 348. This IC LM 348 is a quad operational amplifier IC that is it has four operational amplifiers embedded in this chip. This IC has also got some advanced features such as very high gain, class AB output stage and very low input supply current of 0.6 mA for each op-amp. The 3 channels of mic input require three amplifiers. The three op-amps (IC1b, IC1c and IC1d) out of four in the IC LM 348 are used here as input amplifiers for the corresponding channels. This three input amplifiers are made in this circuit work as non-inverting amplifiers. The operational amplifier IC1a is the output amplifier in this circuit. IC1a is wired as inverting amplifier here. The output from each input amplifiers are given to the inverting terminal of output op-amp. IC1a mixes the signals from each channel and produces the requ...

Simple Condenser Pre Amplifier LM 1458 Circuit Diagram. This is the very Simple Condenser Pre Amplifier LM 1458 Circuit Diagram. This circuit using a LM1458 dual op amp IC. The circuit takes the audio signal rom the condenser microphone and amplifier it, so you can use the microphone as the input to some device which wouldn’t normally accept microphone level signals . Simple Condenser Pre Amplifier LM 1458 Circuit Diagram The circuit requires a 6-9 volt supply. Output of the microphone amplifier can be made variable by connecting a 10kΩ potentiometer . Circuit’s gain can be increased by men perbesar the value of 47K, depending on the input sensitivity of the main amplifier system. The microphone should be housed in a small round enclosure. Parts List Q1,Q2    : LM1458 Op-Amp R1,R2,R3 : 4.7k ohm resistor R4, R5   : 10k ohm resistor R6,R7    : 47k ohm resistor C1,      : 0.22uF ceramic capacitor C2    ...