Monday, July 18, 2011

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OP-AMP (LM741) PRE-AMP MIC SCHEMATIC DIAGRAM

OP-AMP (LM741) PRE-AMP MIC SCHEMATIC DIAGRAM

This is the circuit of Op-Amp Microphone Preamplifier using a single power supply, this circuit suitable for dynamic or electret microphones. Nothing too special here. The Schematic is shown using a dynamic microphone, for use with an electret a pair of suitable biasing resistor is required to power the electret microphone.

rangkaian Op-amp pre-amp micSkema rangkaian op-amp pre-amp mic

Note:

    * use a capacitor with voltage 25volt or more
    * so that the sound produced maximal use supplay good voltage, with output of 18 volts max
    * If the desired strengthening of the different, you can change the value of R1 or R2


The design is a standard non-inverting design, the input is applied to the non-inverting input of the op-amp, which is pin 3 in most cases. The input impedance is 23.5k, the overall voltage gain is determined by R2 and R1according to the following formula:

Vo = (R2 / R1) + 1

With the values of R2 and R1 on the diagram of the voltage gain (for mid band, 1kHz) is approximately 23x or 27.2dB.
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2 comments:

  1. Steve Owens (CISSP)November 29, 2014 at 12:16 PM

    Vo = (R2/R1) + 1. Amazing. Who would have thought that the lowly op amp would solve all of our worlds energy needs. Just think with a circuit that produces voltage from resistance, we can power the world and end our dependence on fossil fuels.

    ReplyDelete
  2. UnknownSeptember 28, 2017 at 10:10 PM

    Sir can give more information about to generate the power from resistor and reduce the dependency on fuels.

    ReplyDelete

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