Preamp
About the Preamp PCB
Preamp is an open source PCB design by vlad-ivanov-name, published on GitHub. It is a 2-layer board measuring 61.4 × 17.2 mm, with 26 components from 15 distinct parts.
Other key parts include the CMIC and OPA172. By type, the board carries 9 capacitors, 7 resistors, 4 connectors, 3 ICs and 2 inductors.
From the project
Cheap PC microphone with a preamplifier
PC microphone with a preamplifier. Supposed to be cheap and provide good sensetivity.
Based on TI's OPA172 reference design. Power is supplied through USB (micro-USB connector), upped to about 11V with a DC-DC converter, then regulated to 9V and filtered.
Adjust DC-DC converter voltage to about 11V. I used 2.54mm pin headers as standoffs for the converter.
Main components on the Preamp
Preamp bill of materials (BOM)
26 components, 15 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 2 | CMIC | CMIC | U101, U102 |
| 1 | OPA172 | SOT-23-5 | U103 |
| 1 | PJ-324 | PJ-324 | J101 |
| 3 | CONN_01X02 | BOARD-CONNECT | P101, P102, P103 |
| 1 | 100k | Potentiometer_Bourns_3296W_3-8Zoll_Inline_ScrewUp | RV101 |
| 1 | 470uH | Choke_Horizontal_RM10mm | L101 |
| 1 | FILTER | R_0805_HandSoldering | L102 |
| 5 | 2.2u | C_0805 | C101, C102, C103, C105, C107 |
| 1 | 10n | C_0805 | C104 |
| 1 | 16p | C_0805 | C106 |
| 1 | 10u | TantalC_SizeA_EIA-3216_HandSoldering | C108 |
| 1 | 100n | C_1206 | C109 |
| 3 | 14k | R_0603 | R101, R102, R103 |
| 3 | 100k | R_0603 | R104, R105, R108 |
| 1 | 50 | R_0603 | R107 |
Preamp design files
The KiCad project lives in the vlad-ivanov-name/microphone repository on GitHub; these links point at the commit this page was built from.
- Layoutpreamp.kicad_pcb
Preamp: common questions
How big is the Preamp PCB?
The Preamp measures 61.4 × 17.2 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Preamp?
26 components, from 15 distinct parts. The full bill of materials is listed on this page.
Where can I download the Preamp design files?
From the vlad-ivanov-name/microphone repository on GitHub, which has the KiCad layout; the links under Design files point to each one.
Can I use the Preamp design in my own project?
The repository has no license, so all rights stay with vlad-ivanov-name. Use it as a reference, and ask the author before reusing the design.
