Tiny mic pre
About the Tiny mic pre PCB
Tiny mic pre is an open source PCB design by ramphands, published on GitHub. It is a 2-layer board measuring 28.6 × 5.6 mm, with 15 components from 10 distinct parts.
Other key parts include the OPA172IDCKR. By type, the board carries 6 capacitors, 6 resistors, 2 connectors and 1 IC.
It belongs with the audio and power & battery designs in this gallery.
From the project
battery-powered ultra-small electret microphone preamp for synth/Monome Norns/field recording
* Battery-mounted w/power switch and jacks - - Mouser cart: https://www.mouser.com/ProjectManager/ProjectDetail.aspx?AccessID=81b8966b79
Microphone-mounted aka "Tiny Mic Pre" (to fit Ø6mm inside diameter steel/alu/brass tubing) - - Mouser cart: https://www.mouser.com/ProjectManager/ProjectDetail.aspx?AccessID=1ea3a70ac9 (NOTE - for this version you MUST** use the specified tantalum capacitors if you plan to fit the completed module into a Ø6mm ID housing. Most tantalums will be too tall, preventing the module from fitting the tubing)
Main components on the Tiny mic pre
Tiny mic pre bill of materials (BOM)
15 components, 10 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | OPA172IDCKR | SOT-353_SC-70-5_Handsoldering | IC1 |
| 1 | mic conn | POM-353P-3-R electret | J1 |
| 1 | 1-0401FBV0T output TAD | Pins_1x04_2.54mm_TH_SWD | J2 |
| 4 | 2.2uF | CP_EIA-2012-15_AVX-P_Pad1.30x1.05mm_HandSolder | C1, C2, C3, C6 |
| 1 | 10pF | C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C4 |
| 1 | 0.1uF | C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C5 |
| 1 | 13.7k | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R1 |
| 3 | 100k | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R2, R3, R6 |
| 1 | 75k | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R4 |
| 1 | 49.9 | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R5 |
Tiny mic pre design files
The KiCad project lives in the ramphands/mic-pre repository on GitHub; these links point at the commit this page was built from.
Tiny mic pre: common questions
How big is the Tiny mic pre PCB?
The Tiny mic pre measures 28.6 × 5.6 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Tiny mic pre?
15 components, from 10 distinct parts. The full bill of materials is listed on this page.
Where can I download the Tiny mic pre design files?
From the ramphands/mic-pre repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.
Can I use the Tiny mic pre design in my own project?
The repository has no license, so all rights stay with ramphands. Use it as a reference, and ask the author before reusing the design.
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