HardLabs

Low noise microphone preamplifier

AhmedYehia-M23·low-noise-microphone-preamplifier·hardware/kicad/Microphone.kicad_pcb

Low noise microphone preamplifier PCB layout, top view — open source board by AhmedYehia-M23

About the Low noise microphone preamplifier PCB

Low noise microphone preamplifier is an open source PCB design by AhmedYehia-M23, published on GitHub. It is a 2-layer board measuring 60.1 × 40 mm, with 24 components from 21 distinct parts.

Other key parts include the OPA1652D. By type, the board carries 8 resistors, 6 capacitors, 5 test points, 2 connectors, 1 IC and 1 microphone.

It belongs with the audio and test & measurement designs in this gallery.

From the project

Low-noise 5 V electret microphone preamplifier with adjustable 30–40 dB gain, OPA1652 analog front end, KiCad PCB design, and LTspice validation.

A 5 V single-supply electret microphone preamplifier designed in KiCad and validated in LTspice. The design provides adjustable gain of approximately 30–40 dB and audio-band filtering, with a simulated -3 dB bandwidth of approximately 33.9 Hz to 17.8 kHz at the 30 dB setting.

- KiCad schematic - KiCad PCB - LTspice simulation - Noise analysis notes

- Circuit design: complete - KiCad schematic and PCB: complete - PCB DRC: 0 errors, 0 warnings, 0 unconnected items - LTspice .op: passes - LTspice transient analysis: passes - LTspice stepped transient analysis: passes - LTspice stepped AC…

Low noise microphone preamplifier, from the project README
From the project README

Main components on the Low noise microphone preamplifier

OPA1652D

Low noise microphone preamplifier bill of materials (BOM)

24 components, 21 distinct parts.

QtyPartRefs
1
OPA1652D
U1
1
POWER IN - 5V
J1
1
AUDIO OUT
J2
1
EMY-6027P/N-R-42
MK1
1
500
RV1
1
VREF
TP1
1
AMP_OUT
TP2
1
LPF_OUT
TP3
1
AUDIO_OUT
TP4
1
GND
TP5
2
100nF
C1, C4
2
10uF
C2, C3
1
27nF
C5
1
4.7uF
C6
2
10K
R1, R2
1
2.2K
R3
1
47K
R4
1
22K
R5
1
220
R6
1
330
R7
Show 1 more
QtyPartRefs
1
100K
R8

Low noise microphone preamplifier design files

The KiCad project lives in the AhmedYehia-M23/low-noise-microphone-preamplifier repository on GitHub; these links point at the commit this page was built from.

Low noise microphone preamplifier: common questions

How big is the Low noise microphone preamplifier PCB?

The Low noise microphone preamplifier measures 60.1 × 40 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Low noise microphone preamplifier?

24 components, from 21 distinct parts. The full bill of materials is listed on this page.

Where can I download the Low noise microphone preamplifier design files?

From the AhmedYehia-M23/low-noise-microphone-preamplifier repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Low noise microphone preamplifier design in my own project?

The repository has no license, so all rights stay with AhmedYehia-M23. Use it as a reference, and ask the author before reusing the design.

Similar boards