Condenser Mic Preamplifier Circuit

Simple easy to construct Condenser Mic Preamplifier Circuit designed by using sing transistor (BC547). This PreAmplifier circuit constructed to operate with 5V, 500mA DC supply. We know preamplifier is a electronic circuit that converts weak electric Audio Signal from sound transducer to Output Audio signal strong enough for further processing.




Here condenser microphone is a transducer which converts Acoustic sound signal into Electrical Audio Signal. This condenser mic works in the principle of two plate capacitor.

Circuit Diagram

Components Required (BOM)

1C2, C4, C51µFCP_Radial_D4.0mm_P1.50mm3
2C122µFCP_Radial_D4.0mm_P1.50mm1
3C30.1µFC_Disc_D3.0mm_W1.6mm_P2.50mm1
4R14.7KΩR_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal1
5R21KΩR_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal1
6R32.2KΩR_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal1
7R4560KΩR_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal1
8R55.6KΩR_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal1
9R656ΩR_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal1
10Q1BC547TO-92_Inline1
11J1Conn_01x04_MalePinHeader_1x04_P2.00mm_Vertical1

Condenser Mic Not mentioned in Bill of Materials.

Construction & Working

5V DC Supply directly applied to the Condenser mic through R1 Resistor. Output from Mic taken from the positive terminal Capacitor C1, C3 are used as filter capacitors, Electrical Audio signal from mic terminal is applied to the Q1 transistor Base terminal through R2, C4 elements.

Here Q1 transistor configured in common emitter configuration. Output from the transistor taken out from collector terminal followed by C5 capacitor. Audio signal from here can be Amplified by the watts range power amplifier.

Printed Circuit Board

Condenser Mic Preamplifier Circuit Gerber Files.

Interactive Board Viewer

     




2 thoughts on “Condenser Mic Preamplifier Circuit

    1. This Pre Amplifier circuit designed to work with All types of Condenser Microphone. This Circuit may require some specification changes according to the input impedance of Amplifier.

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