Low noise microphone preamplifier circuit using NE5532

Here is two Low noise microphone preamplifier circuit. Which is simple circuit but high quality sound,includes devices that are selected very well.

This circuit can be used to all normal microphone, for example: the dynamic microphone of Europe zone that has impedance of about 200 ohms, the Japan microphone has impedance of about 500-600 ohms or others higher impedance microphone.

This circuit have 2 model are a balance Input Pre Microphone Amplifier circuit as Figure 1 and an Unbalance Input pre Microphone Amplifiers to can choose as you needed.

balance  Pre microphone amplifier circuit


Figure 1 Balance Input Pre Microphone Amplifier circuit

How it works
Balance Input Pre Microphone Amplifier as Figure 1. The input signal will be sent to pin 3 and pin 5 of ICs, to increase signal. And send to pin 9-10 of IC3 that act as the differential amplifier. Thus, noise signal and various hum will be rid go away.

The output from IC3 will be increased again with IC4 to get the output signal as need.

The second section, the unbalance input as Figure 2 will see that the simple circuits by have two low noise ICs to connected together as the amplifiers circuit from microphone to high amplitude as need.

Unbalance low noise microphone Preamplifiers


Figure 2 Unbalance Input low noise pre microphone amplifiers

How to builds

PCB-layout-of-balance-low-noise-pre-microphone-amplifiers

You Just assembling equipment to the PCB correctly.
As Figure 3 and Figure 4

Figure 3 The PCB layout and components layouts of Balance Input Pre Microphone Amplifier circuit

PCB-layout-of-unbalance-low-noise-pre-microphone-amplifiers


Figure 4 The PCB layout and components layouts of Unbalance Input Pre Microphone Amplifier circuit

Should be used high-quality devices. For example: Metal Film Resistors, Which is a low noise.

All capacitors should be of high quality For example: polypropylene (MKP) or Polycarbonate (MKC) etc.

Parts you will need

BALANCE INPUT

IC1: TL074, Quad Low-Noise JFET-Input General-Purpose Op-Amp

0.25W Resistors tolerance: 1%
R1, R4: 330 ohms
R2, R3: 22K
R5: 1.5K
R6, R7: 6.8K
R8, R8: 1.2K
R10, R11, R13: 5.6K
R12: 4.7K
R14: 100K

Capacitors, Polypropylene (MKP), Polycarbonate (MKC)
C1: 22pF 50V
C2: 1.5-1.8uF 50V
C5, C6: 0.1uF 50V

Electrolytic Capacitors
C3, C4: 10uF 25V

SW: SLIDE 6P


UNBALANCE INPUT
IC1: NE5532, M5218P, OP Amp Dual General Purpose, 8-DIP

0.25W Resistors tolerance: 1%
R1: 680 ohms
R2, R3: 47K
R4: 100 ohms
R5, R6: 1K
R7: 8.2K
R8: 100K

Polypropylene (MKP) or Polycarbonate (MKC)
C1: 1uF 50V
C2, C3: 22pF 50V
C4: 1.5uF 50V
C5, C6: 0.1uF 50V
SW: SLIDE 3P
BALANCE INPUT

NE5532 MIC Preamplifier 2 channel

This is a Pre Mic circuit or Microphone preamplifier circuit model 2 CH. By this circuit uses integrated number circuit NE5532 or LF353. It perform enlarge sound signal from Dynamic Micro phone give the power goes up for subsequently submit to go to still stereo power amplifier circuit next. This circuit be of good quality good sound, because of use the integrated circuit decreases the noise, but should use the fire feeds +12V GND -12V with. The VR1 and VR2 perform fine decorate the sound.

The detail is other and PCB sees in a picture below.

Simple Pre MIC  circuit 2 channel using NE5532 LF353


Circuit Pre MIC (microphone preamplifier) 2 CH by IC NE5532 or LF353

PCB Pre MIC (microphone preamplifier) 2 CH by IC NE5532 or LF353

These circuits require DC regulator circuits only. You may use power supply circuits below.

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This Post Has 3 Comments

  1. Awesome Circuit.

  2. Hi Salim Khan,
    Thanks for your feedback.

  3. Can i use this circute with Condenser Microphone..

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