Thursday, October 9, 2014

Low Noise Pre-Amp Microphone Circuit Schematic for High Quality Audio

Eltronicschool. - When do you need pre-amp microphone circuit schematic for high quality audio system, we think you can use the schematic like in figure 1 below. According PramonoJGJ blog said that to get quality like this usually requires a low noise microphone amplifier. And to get it usually we use transistor for amplifier to get low noise.

Circuit Schematic

Figure 1. Low Noise Pre-Amp Microphone Circuit (Source: PramonoJGJ)

Component List
  1. ECM or Dynamic Microphones
  2. Resistors
  3. Capacitors
  4. Transistor BC549


Circuit schematic like in figure 1 above is Low Noise Pre-Amp Microphone Circuit Schematic for High Quality Audio. In this circuit using low noise transistors BC549 and at the foot of the emitter in the given filter in the form of electrolytic capacitors besides having feedback from the emitter transistors reply to two toward first base on the transistors that will produce sounds that no defects / distortion.

The gain vs. frequency response and phase vs. frequency can be seen in the picture below:

From the gain vs frequency curve seen the reinforcement that remains on rekuensi shift of 10 Hz s / d 100 KHz, meaning that the feedback function went well and the frequency response of the gain can be concluded that with the increase in frequency does not affect the resulting gain.

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