Dynamic Microphone Amplifier

Wed, 21 Oct 2009 12:13:24 +0000

Here is the dynamic microphone amplifier circuit diagram. This circuit should be perfect for dynamic microphone…

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Dynamic microphones are versatile and ideal for general-purpose use. They use a simple design with few moving parts. They are relatively sturdy and resilient to rough handling. They are also better suited to handling high volume levels, such as from certain musical instruments or amplifiers. They have no internal amplifier and do not require batteries or external power.

Schematic diagram:

Dynamic Microphone Pre-Amplifier Circuit

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Circuit Notes:

This dynamic microphone amplifier circuit has a total gain of 200 times.
If you use 200? microphones R4 must be 220? and C1 is 4.7uF.
For the best performance, use metal film resistor, MKM type for unpolar capacitor and tantalum type for bipolar capacitor. Use stabled and regulated power supply.

With a 3mVpp input signal the output will be 800mVpp. The maximum output voltage was 10Vpp when the input is 50mVpp. The frequencies domain is between 50Hz and 100KHz.

The post Dynamic Microphone Amplifier first appeared on Electronic Schematic Diagram.

Low Impedance Microphone Amplifier

Tue, 10 Mar 2009 22:13:16 +0000

This is the circuit diagram of low impedance microphone amplifier. The circuit designed for use with low impedance (~200 ohm) microphones. It will work with regulated voltages between 6-30VDC. If you don’t build the impedance adapter part with T1, you get a microphone amplifier circuit for higher impedance microphones. In this case, you should directly connect the input signal to C7 (bypass the TI transistor).

Low Impedance Microphone Amplifier Component list:

R1=15k	C1= 3k9	U1= TL081
R2= 150k	C2= 100u	D1= 1N4148
R3= 2k2	C3= 22u	CN1= SIL6
R4= 820	C4= 4u7
R6= 10k	C5= 470u
R7= 10k	C6= 10u
P1= 1M	C7= 100n
	C8= 47u UNIPOLAR

PCB layout (bottom):

PCB layout (top-component placement):

Good luck with this low impedance microphone amplifier circuit project

The post Low Impedance Microphone Amplifier first appeared on Electronic Schematic Diagram.

microphone amplifier | Electronic Schematic Diagram

Dynamic Microphone Amplifier

Low Impedance Microphone Amplifier