Mic pre
About the Mic pre PCB
Mic pre is an open source PCB design by ramphands, published on GitHub. It is a 2-layer board measuring 45 × 14 mm, with 17 components from 12 distinct parts.
Other key parts include the OPA172IDCKR. By type, the board carries 6 capacitors, 6 resistors, 3 connectors, 1 IC and 1 switch.
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 Mic pre
Mic pre bill of materials (BOM)
17 components, 12 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | OPA172IDCKR | SOT-353_SC-70-5_Handsoldering | IC1 |
| 1 | power conn | PinSocket_1x02_P2.54mm_Vertical | J1 |
| 1 | mic input | CUI_SJ1-3523N | J2 |
| 1 | line out | CUI_SJ1-3523N | J3 |
| 1 | SW_SPDT | LSS12-V-B | SW1 |
| 4 | 2.2uF | CP_EIA-3216-18_Kemet-A_Pad1.58x1.35mm_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 |
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.
- Layoutkicad files/mic pre.kicad_pcb
- Schematickicad files/mic pre.kicad_sch
Mic pre: common questions
How big is the Mic pre PCB?
The Mic pre measures 45 × 14 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Mic pre?
17 components, from 12 distinct parts. The full bill of materials is listed on this page.
Where can I download the 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 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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