|
|
This is the documentation for the DStat hardware.
|
|
|
|
|
|
Table of Contents:
|
|
|
## Table of Contents:
|
|
|
|
|
|
* [Design Files](#design-files)
|
|
|
* [Materials](#materials)
|
... | ... | @@ -13,25 +13,25 @@ Table of Contents: |
|
|
* [Voltammetry/Amperometry](#voltammetry-amperometry)
|
|
|
* [License Information](#license-information)
|
|
|
|
|
|
# Design Files
|
|
|
## Design Files
|
|
|
The hardware design files were created and can be edited in [KiCAD](http://www.kicad-pcb.org).
|
|
|
PDF versions of the electrical schematic and PCB layout can be found in the root directory: `dstat-mainboard-sch.pdf` and `dstat-mainboard-pcb.pdf`.
|
|
|
# Materials
|
|
|
## Printed Circuit Board (PCB)
|
|
|
## Materials
|
|
|
### Printed Circuit Board (PCB)
|
|
|
![full PCB](images/Full_PCB.jpg)
|
|
|
|
|
|
One DStat mainboard PCB is required for each potentiostat.
|
|
|
The specifications of the PCB are tuned for the [Pentalogix](http://www.pentalogix.com) US Quickturn Prototype PCB service, but many other companies are capable of fabricating the board.
|
|
|
Fabrication files can be generated with KiCAD or can be found in the `gbr` directory as standard Gerber files.
|
|
|
All files use mm as base units.
|
|
|
## Components
|
|
|
### Components
|
|
|
The list of electronic components required to build the DStat can be found in the `dstat-mainboard.csv` file.
|
|
|
A combined parts list with suggested components can be found in the `dstat-mainboard-partslist.csv` file.
|
|
|
All components apart from pin headers are surface mount.
|
|
|
Take note of the package size in the `Footprint` column as most components come in multiples sizes.
|
|
|
The naming of the references in the file and notes regarding component selection follow:
|
|
|
|
|
|
### Reference Key
|
|
|
#### Reference Key
|
|
|
| Reference | Component Type| Selection Notes |
|
|
|
| --------- | --------- | --------- |
|
|
|
| C | Non-polarized capacitor | Unless otherwise specified, 47u, 10u, 1u, 100n, 10n, 4.7n values can be wide tolerance parts |
|
... | ... | @@ -51,7 +51,7 @@ The naming of the references in the file and notes regarding component selection |
|
|
| WSHIELD | Working electrode shield connection | Single hole for soldering wire or connector |
|
|
|
| X | Quartz crystal resonator | Surface mount HC49 package |
|
|
|
|
|
|
## Tools
|
|
|
### Tools
|
|
|
![solder paste](images/paste.jpg)
|
|
|
|
|
|
To assemble the PCB, a few tools are recommended:
|
... | ... | @@ -64,7 +64,7 @@ To assemble the PCB, a few tools are recommended: |
|
|
* cotton or foam swabs
|
|
|
* solvent suitable for removing flux (depends on type of solder paste, usually water or isopropanol)
|
|
|
|
|
|
# PCB assembly
|
|
|
## PCB assembly
|
|
|
A simple way to speed up assembly of the PCB is to use a small scale reflow technique in which solder paste is applied to the PCB, then heated with a hotplate to connect the components.
|
|
|
The mainboard can be soldered by hand but the fine pitch components make this difficult.
|
|
|
|
... | ... | @@ -108,7 +108,7 @@ If any shorts are found, inspect components for solder bridges. |
|
|
|
|
|
![Finished Board](images/PCB_finished.jpg)
|
|
|
|
|
|
# Connections
|
|
|
## Connections
|
|
|
| Connector | Function |
|
|
|
| --------- | -------- |
|
|
|
| Counter | Output of potentiostatic amplifier. Drives counter electrode to control WE potential |
|
... | ... | @@ -130,7 +130,7 @@ If any shorts are found, inspect components for solder bridges. |
|
|
| U3D | Connects Reference electrode buffer to potentiostatic amplifier input. |
|
|
|
| U12 (X0–7) | Selects between feedback components of transimpedance amplifier. |
|
|
|
|
|
|
## Voltammetry/Amperometry
|
|
|
### Voltammetry/Amperometry
|
|
|
|
|
|
For a standard 3-electrode cell, Working, Counter, and Reference electrodes connect to the corresponding connection points.
|
|
|
Switches U3A, U3C, and U3D should be closed during measurements.
|
... | ... | @@ -139,7 +139,7 @@ For a 2-electrode cell, the Reference and Counter electrode connectors can be co |
|
|
For a standard 3-electrode cell, Working, Counter, and Reference electrodes connect to the corresponding connection points.
|
|
|
Switches U3A, U3C, and U3D should be closed during measurements.
|
|
|
|
|
|
# License Information
|
|
|
## License Information
|
|
|
This wiki, the hardware schematics and layouts, and all other documentation describing the DStat hardware are licensed under the [CERN OHL v. 1.2.](LICENSE/LICENSE.pdf)
|
|
|
©Michael D. M. Dryden 2014
|
|
|
|
... | ... | |