... | ... | @@ -78,7 +78,7 @@ Pads for fine-pitch components can be covered with a continuous line of paste fo |
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1. Using tweezers, carefully populate the front of the PCB with surface mount components, making sure of the correct orientation of ICs. (Match the corner of the IC marked with a dot with the corresponding mark on the PCB)
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The solder paste will help keep the components in place.
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Perfect alignment isn't necessary as the surface tension of the solder will center the components once melted.
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Perfect alignment isn't necessary as the surface tension of the solder will centre the components once melted.
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![PCB with components](images/PCB_parts.jpg)
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... | ... | @@ -96,12 +96,12 @@ Defects can be corrected with a soldering iron by applying heat to single pins o |
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These include surface mount components on the back of the PCB and components that sit in holes (pin headers).
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![Pin headers](images/PCB_through_hole.jpg)
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![Back components](images/PCB_back.jpg_)
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![Back components](images/PCB_back.jpg)
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1. Clean flux off the PCB using a suitable solvent, rubbing the surface of the board with a swab.
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Especially if using water, ensure the board is completely dry before proceeding.
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![PCB cleaning](images/PCB_cleaning.jpg)
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![PCB cleaning](images/PCB_clean.jpg)
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1. Before attempting connection of the instrument, check for shorts from the power rails to ground using the multimeter. (The P8 connector provides both power rails and ground)
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If any shorts are found, inspect components for solder bridges.
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... | ... | @@ -140,7 +140,7 @@ For a standard 3-electrode cell, Working, Counter, and Reference electrodes conn |
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Switches U3A, U3C, and U3D should be closed during measurements.
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# License Information
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This wiki, the hardware schematics and layouts, and all other documentation describing the DStat hardware is licensed under the [CERN OHL v. 1.2.](LICENSE/LICENSE.pdf)
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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)
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©Michael D. M. Dryden 2014
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You may redistribute and modify this documentation under the terms of the CERN OHL v.1.2. (http://ohwr.org/cernohl).
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