Introduction: Microphone Amplifier NE5532.

About: Hey everyone! My hobby is electronics. I share my experience in the development of devices made in the home with my own hands.

Good afternoon, dear viewers and readers. In today’s article, I will show you the universal microphone amplifier based on the microcircuit NE5532.

Step 1: Youtube Video.

Link to this video:

Step 2: Links to Radio Components.

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You can find all the necessary information for repeating this device by clicking on the link to Patreon:

Links to radio components:                                                                                                                        

Radio parts store:

Microchip NE5532:

Capacitor 105J uF 100 V:

Tantalum capacitor 22uF 16V:

Electret microphone:

Header & Socket connectors 2.54 mm:

Terminal block 5 mm:

Mounting racks:

Step 3: Circuit Design and PCB Layout.

The microphone amplifier schematic diagram and printed circuit board (PCB) were developed in Easy EDA online environment.

The microphone amplifier can work with two or three output electret microphones. Good sound quality is achieved through the use of radio components such as tantalum capacitors and the low noise operational amplifier microcircuit NE5532.

The circuit contains two stages with controlled gain. The gain of the first stage is continuously adjustable by a potentiometer POT1 in the range of 1 ... 10 times. The gain of the second stage can be changed in steps using a jumper JUMP1. If the jumper leads are not shorted together, the gain will be greatest, which is determined by the ratio of R8 and R5 resistors. When a jumper is connected to R6 or R7 in parallel with R8, the gain will be less.

I often use this microphone amplifier circuit to create lighting devices that use sound accompaniment.

Based on the schematic diagram, we get a double-sided printed circuit board

Step 4: Installation of Radio Components on the PCB.

Next, let’s proceed to the installation of radio components on the control circuit board.

Step 5: 3D Visualization.

The case of the device for the microphone amplifier was designed in the KOMPAS 3D program. All parts were made of organic transparent glass, 2 mm thick.

Step 6: Installing Brass Racks on the PCB.

Next, on the printed circuit board, we insert brass racks into the holes, with a total length of 12 mm, with an external and internal thread M3, tightening them with brass racks with internal thread M3, 15 mm long on the other side.

Step 7: Installation of Bottom Detail.

From the rear side of the printed circuit board, we install the lower part over the brass racks, tightening everything with M3 screws, 5 mm long.

Step 8: Installation of Side and Top Details.

From the front side, into the rectangular grooves of the lower part, insert 4 side parts, on top of which we install the upper part, fastening everything with M3 screws, 5 mm long.

Step 9: Work Result.

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