Simple Microphone Preamplifier Project


Posted on Feb 6, 2014

This is a simple microphone preamplifier circuit which you can use between your microphone and stereo amplifier. This circuit amplifier microphone suitable for use with normal home stereo amplifier line/CD/aux/tape inputs. This mic preamp can take both dynamic and Electret microphone inputs (preamplifier provides power foe Electret microphone elem


Simple Microphone Preamplifier Project
Click here to download the full size of the above Circuit.

ents). The idea of this circuit is to keep the design as simple as possible to be easy to build. That was my goal when I needed a simple external microphone preamplifier for my mixer. The performance of the circuit is nothing superior but can be used with many not so serious projects. The circuit is a simple one transistor amplifier with amplification of about 30-40 dB (depends on transistor, temperature and voltage). The dynamic mic input is just a simple one transistor amplifier circuit with nothing special. Electret microphone input has a resistor R1 fo feeding current through electret microphone capsule when it is connected to the electret microphone input. Electret microphone needs some current (about 1 mA) flowing through it to operate, because there is a small amplifier circuit inside the microphone capsule. This circuit is suitable for all typical cheap electret capsules which available from any electronic component shop. Because electret microphones have higher signal level output, it is quite easy to overdrive the amplifier when you shout to electret microphone.




Leave Comment

characters left:

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    Dark-Activated Alarm With Pulsed Tone Output Circuit
    Digital Clock
    Up/Down Timer For A Power Antenna
    Process-Control
    Operational Amplifier Voltage Comparator Circuits
    PUSH-PULL DC-AC INVERTER
    1-20 minutes a timing circuit
    Multi-channel data acquisition ISO100 isolation circuit of a programmable gain amplifier
    AF locked loop circuit diagram
    Conducting pipe control rechargeable delay circuit



    Top