2 layers106 × 95.4 mm
2 layers49.5 × 25.4 mm
An ICL7660 based negative rail daughter board.
- Size
- 49.5 × 25.4 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 24
- Nets
- 13
- Pads
- 59
- Tracks, vias
- 52, 0
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 3
- Created
- 3 Aug 2014
- Updated
- 20 May 2017
Overview
ICL7660 is an open-source printed circuit board by cellularmitosis, from the cellularmitosis/NegativeRail repository on GitHub, published under the MIT licence. It is a 2-layer board of 49.5 × 25.4 mm with 24 parts on 13 nets, routed with 52 tracks and 0 vias.
It is built around the ICL7660N and 79L05. Its parts include 11 capacitors, 3 resistors, 3 ICs, 2 inductors and 1 connector.
Main components
2README
README.mdNegativeRail
An ICL7660-based negative rail daughter board.
Development
See my eevblog.com forum thread for lots of oscilloscope screenshots as I tested various iterations of this design.
Status
This board has been tested using the dutch oven faraday cage:
Performance matches that of the prototype (see the eevblog.com forum thread).
Noise into a 1k load:
Noise with power supply disconnected (i.e., noise floor of measurement system):
This indicates that the ~750kHz spikes are not coming from the ICL7660 board (perhaps this is due to the switch-mode power supply inside of the scope?).
Board design v1
Initial board design.
Gerbers
Schematic
PDF.
License
This board design is Open-Source Hardware. It is licensed under the MIT License. It was designed by Jason Pepas.
Parts
24| Qty | Value | Footprint | References |
|---|---|---|---|
| 5 | 10uF | ELCAP_10_20_V_059A | C1, C3, C4, C9, C11 |
| 4 | 1uF | BOXCAP_02_03_02_059A | C5, C7, C8, C10 |
| 2 | 10 | R_AXIAL_0W25_059A | R1, R2 |
| 2 | 1000uH | R_AXIAL_0W25_059A | L1, L2 |
| 2 | 100uF | MedCap | C2, C6 |
| 2 | FERRITE | FERRITE_AXIAL_04_069A | FB1, FB2 |
| 1 | 4.7k | R_AXIAL_0W25_059A | R3 |
| 1 | 7809 | TO-220_V_069C | U1 |
| 1 | 79L05 | TO-92_U_059A | U3 |
| 1 | CONN_4 | PIN_ARRAY_4x1 | P1 |
| 1 | ICL7660 | DIP8_059A | U2 |
| 1 | OSHW-logo_silkscreen-back_4mm | OSHW-logo_silkscreen-back_4mm | G*** |
| 1 | Val** | hole_M3 | H*** |
Questions
How big is the ICL7660 PCB?
It measures 49.5 × 25.4 mm and has 2 copper layers, 1.6 mm thick.
What parts does the ICL7660 use?
24 parts, built around the ICL7660N and 79L05. 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 ICL7660 KiCad files?
From the cellularmitosis/NegativeRail repository on GitHub, at the commit this page was made from: the board is kicad/ICL7660.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the ICL7660 design in my own project?
Its repository publishes it under the MIT licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
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