2 layers58 × 80 mm
2 layers73.7 × 34.3 mm
Micpreamp
androiders/pcbsRpo for pcb layouts, gerber and gcode files
- Size
- 73.7 × 34.3 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 17
- Nets
- 16
- Pads
- 48
- Tracks, vias
- 74, 0
- Routed
- Yes
- KiCad
- KiCad 5 (file 20171130)
- Created
- 18 Jun 2018
- Updated
- 30 Aug 2022
Overview
Micpreamp is an open-source printed circuit board by androiders, from the androiders/pcbs repository on GitHub. It is a 2-layer board of 73.7 × 34.3 mm with 17 parts on 16 nets, routed with 74 tracks and 0 vias.
It is built around the LM358. Its parts include 5 capacitors, 5 resistors, 4 connectors and 2 ICs.
Main components
1README
README.mdView this project on CADLAB.io.
pcbs
Repo for pcb layouts, gerber and gcode files
Ki-Cad
PCB layout:
- Use as wide traces as possible. 1mm preffered.
- Dont use "filled areas" if possible. It does not make good geometry in flatcam
- Don't forget to set origin marker
- Export gerber: use auxiliary axis
FlatCam
geometry generation:
- If you are using thru-hole components or using bottom layer, mirror around y axis for both geometry and Drilling
- Edit drill files if necessary for fewer drill sizes
- TODO: test double sided layout by mirroring around center axis!
Isolation generation:
-
Current isolation mill depth to test: 0.04 mm (0.05 was tested and seems to work fine!) (Common copper depth is about 0.03 mm)
-
Current feedrate on isolation milling to test: 60 mm/s
-
spindle speed 12000 rpm
-
use 0.2 mm tool width on cnc generation
-
2 passes with 0.1 overlap
Cutout generation:
- Current cutout mill depth: 1.6 mm
- Current feedrate on cutout milling: 40 mm/s
- spindle speed 12000 rpm
FlatCam defaults:
- put a link in ~/.FlatCAM/defaults.json
bCNC
Probe:
- Fastfeed: 120
- Probefeed: 25
- Probe points: 4/cm (in each direction)
Drilling:
- Current drill plunge rate to test 20 mm/s
- spindle speed: 12000 rpm
- Drill depth: 1.6
Parts
17| Qty | Value | Footprint | References |
|---|---|---|---|
| 2 | 15pF | Capacitor_THT:C_Radial_D5.0mm_H5.0mm_P2.00mm | C1, C4 |
| 2 | 2.2uF | Capacitor_THT:C_Radial_D5.0mm_H5.0mm_P2.00mm | C2, C5 |
| 2 | 56K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R2, R3 |
| 1 | 100K | Potentiometer_THT:Potentiometer_Alps_RK09K_Single_Vertical | RV1 |
| 1 | 10K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R5 |
| 1 | 20pF | Capacitor_THT:C_Radial_D5.0mm_H5.0mm_P2.00mm | C3 |
| 1 | 2K7 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R1 |
| 1 | 3.3 reg | Package_TO_SOT_THT:TO-220-3_Vertical | U1 |
| 1 | 47 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R4 |
| 1 | Gnd | Connector_Pin:Pin_D1.0mm_L10.0mm | J4 |
| 1 | Input | Connector_Audio:StereoJack_3.5mm_Switch_Ledino_KB3SPRS_Horizontal | J1 |
| 1 | LM358 | Package_DIP:DIP-8_W7.62mm_LongPads | U2 |
| 1 | Output | Connector_Audio:StereoJack_3.5mm_Switch_Ledino_KB3SPRS_Horizontal | J2 |
| 1 | Vdd | Connector_Pin:Pin_D1.0mm_L10.0mm | J3 |
Questions
How big is the Micpreamp PCB?
It measures 73.7 × 34.3 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Micpreamp use?
17 parts, built around the LM358. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the Micpreamp KiCad files?
From the androiders/pcbs repository on GitHub, at the commit this page was made from: the board is micpreamp/micpreamp.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Micpreamp design in my own project?
Its repository states no licence, so its author keeps all rights: ask androiders before reusing the design.
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