Microphone Amplifier NE5532.

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

Link to this video:

• https://youtu.be/DXIkniTAe08

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

• https://www.patreon.com/HOBBYHOMEELECTRONICS

Links to radio components:                                                                                                                        

Radio parts store:

• http://ali.pub/3a5caa

Microchip NE5532:

• http://alii.pub/4o1sap

Capacitor 105J uF 100 V:

• http://alii.pub/6972cl

Tantalum capacitor 22uF 16V:

• http://alii.pub/4o1wo0

Electret microphone:

• http://alii.pub/6972fw

Header & Socket connectors 2.54 mm:

• http://alii.pub/4o1ukk

Terminal block 5 mm:

• http://alii.pub/5umabl

Mounting racks:

• http://ali.pub/55dw3k

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

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

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.

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.

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.

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.

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