Electret preamp
About the Electret preamp PCB
Electret preamp is an open source PCB design by dunkelstern, published on GitHub. It is a 2-layer board measuring 34 × 20.5 mm, with 16 components from 13 distinct parts.
Other key parts include the NE5532. By type, the board carries 6 capacitors, 6 resistors and 1 IC.
It belongs with the audio and test & measurement designs in this gallery.
From the project
Electret Microphone Preamp based on Texas Instruments Single-Supply, Electret Microphone Pre-Amplifier Reference Design by John Caldwell
This design is purely based on Texas Instruments Single-Supply, Electret Microphone Pre-Amplifier Reference Design by John Caldwell
The Jupyter notebook is basically a interactive Version of that reference design PDF. I claim no copyright on this.
The included Jupyter Notebook is an interactive version of the reference design PDF from Texas instruments. You can play with all values and let the program re-calculate all relevant values to be used in your own design.
Main components on the Electret preamp
Electret preamp bill of materials (BOM)
16 components, 13 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | NE5532 | SOIC-8_3.9x4.9mm_P1.27mm | U1 |
| 1 | Out | PinHeader_1x02_P2.54mm_Horizontal | LineOut1 |
| 1 | MK100 | PinHeader_1x02_P2.54mm_Horizontal | Mic1 |
| 1 | Power | PinHeader_1x02_P2.54mm_Horizontal | Power1 |
| 1 | 100n | C_1206_3216Metric_Pad1.42x1.75mm_HandSolder | C1 |
| 1 | 18p | C_0805_2012Metric_Pad1.15x1.40mm_HandSolder | C2 |
| 2 | 10u | CP_Elec_4x5.8 | C3, C6 |
| 1 | 10u | CP_Elec_6.3x9.9 | C4 |
| 1 | 1u | CP_Elec_4x5.8 | C5 |
| 1 | 6.2k | R_1206_3216Metric_Pad1.42x1.75mm_HandSolder | R1 |
| 1 | 180k | R_1206_3216Metric_Pad1.42x1.75mm_HandSolder | R2 |
| 3 | 100k | R_1206_3216Metric_Pad1.42x1.75mm_HandSolder | R3, R5, R6 |
| 1 | 47 | R_1206_3216Metric_Pad1.42x1.75mm_HandSolder | R4 |
Electret preamp design files
The KiCad project lives in the dunkelstern/electret_preamp repository on GitHub; these links point at the commit this page was built from.
Electret preamp: common questions
How big is the Electret preamp PCB?
The Electret preamp measures 34 × 20.5 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Electret preamp?
16 components, from 13 distinct parts. The full bill of materials is listed on this page.
Where can I download the Electret preamp design files?
From the dunkelstern/electret_preamp repository on GitHub, which has the KiCad layout; the links under Design files point to each one.
Can I use the Electret preamp design in my own project?
The repository has no license, so all rights stay with dunkelstern. Use it as a reference, and ask the author before reusing the design.
Similar boards
StackLink
gusmanb
52.3 × 10.5 mm5 parts2LGPL-3.05.0k
AnalyzerBoxPCB fork
52.7 × 47.9 mm54 parts4LGPL-3.05.0k
LevelShifter
28.3 × 39.8 mm21 parts2LGPL-3.05.0k
KLOR
GEIGEIGEIST
160.2 × 118.3 mm79 parts2LGPL-3.01.2k
Pots
shanteacontrols
390 × 93 mm75 parts2LApache-2.0956
ButtonsLEDs
390 × 37 mm82 parts2LApache-2.0956