2 layers122.2 × 122.8 mm
Dcpower
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115 parts1
2 layers90 × 40 mm
Juma adj cx
oseaudiolabs/adjustable-cap-mx3Adjustable capacitance multiplier PCB
- Size
- 90 × 40 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 18
- Nets
- 7
- Pads
- 36
- Tracks, vias
- 9, 129
- Pours
- 7
- Routed
- Yes
- KiCad
- KiCad 5 (file 20171130)
- Created
- 7 Aug 2018
- Updated
- 11 Aug 2018
Overview
Juma adj cx is an open-source printed circuit board by oseaudiolabs, from the oseaudiolabs/adjustable-cap-mx repository on GitHub. It is a 2-layer board of 90 × 40 mm with 18 parts on 7 nets, routed with 9 tracks and 129 vias.
It is built around the 2SC5200 and BD139. Its parts include 4 capacitors, 4 resistors, 4 connectors and 2 transistors.
Main components
2README
README.mdAdjustable BJT Capacitance Multiplier
Original circuit from http://www.diyaudio.com/forums/solid-state/297921-jumas-easy-peasy-capacitance-multiplier-4.html#post4858155.
Resources
Render
Parts
18| Qty | Value | Footprint | References |
|---|---|---|---|
| 3 | Mounting_Hole | MountingHole:MountingHole_3.2mm_M3_DIN965 | MK1, MK2, MK3 |
| 2 | 470u | Capacitor_THT:CP_Radial_D12.5mm_P5.00mm | C3, C4 |
| 1 | 10k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R3 |
| 1 | 150 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R2 |
| 1 | 22m | Capacitor_THT:CP_Radial_D35.0mm_P10.00mm_SnapIn | C2 |
| 1 | 2SC5200 | Package_TO_SOT_THT:TO-264-3_Vertical | Q2 |
| 1 | 2k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R4 |
| 1 | 2k/.5W | lib:3362P-1-102LF | RV1 |
| 1 | 2u | Capacitor_THT:C_Rect_L18.0mm_W9.0mm_P15.00mm_FKS3_FKP3 | C1 |
| 1 | 3k/2W | Resistor_THT:R_Axial_DIN0414_L11.9mm_D4.5mm_P15.24mm_Horizontal | R1 |
| 1 | BD139 | Package_TO_SOT_THT:TO-126-3_Vertical | Q1 |
| 1 | IN+ | ose-audio-labs:FASTON_TAB | J1 |
| 1 | IN- | ose-audio-labs:FASTON_TAB | J2 |
| 1 | OUT+ | ose-audio-labs:FASTON_TAB | J3 |
| 1 | OUT- | ose-audio-labs:FASTON_TAB | J4 |
Questions
How big is the Juma adj cx PCB?
It measures 90 × 40 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Juma adj cx use?
18 parts, built around the 2SC5200 and BD139. 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 Juma adj cx KiCad files?
From the oseaudiolabs/adjustable-cap-mx repository on GitHub, at the commit this page was made from: the board is juma-adj-cx.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Juma adj cx design in my own project?
Its repository states no licence, so its author keeps all rights: ask oseaudiolabs before reusing the design.
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