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Equipment/PCB etch station: Difference between revisions
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→2nd Tank - Etchant
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Now contains CuCl2 etchant at ~3M strength. Ready to use. (Heater does not seem to shut down by itself so make sure not to overheat the solution, being worked on) | Now contains CuCl2 etchant at ~3M strength. Ready to use. (Heater does not seem to shut down by itself so make sure not to overheat the solution, being worked on) | ||
Resupply: instructions below! Required materials are: | |||
* HCl | |||
* Copper | |||
* NaOH (for checking concentration) | |||
====CuCl2 Etchant==== | ====CuCl2 Etchant==== | ||
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See [[File:CuCl.pdf]] for maintenance instructions. These are basically : Check colour. Bubble if dark. Titrate against 1 molar NaOH to check acid concentration (this only requires a check for precipitate, no need for acid indicator). Add HCl if necessary. | See [[File:CuCl.pdf]] for maintenance instructions. These are basically : Check colour. Bubble if dark. Titrate against 1 molar NaOH to check acid concentration (this only requires a check for precipitate, no need for acid indicator). Add HCl if necessary. | ||
If you use it, don't rely on the small bubbler to provide agitation - keep it moving the whole time (and be careful your board doesn't walk out the end of the basket when you do that). The small bubbler is really only there to re-aerate the solution after use, as it's quiet enough to leave on. | If you use it, don't rely on the small bubbler to provide agitation - keep it moving the whole time (and be careful your board doesn't walk out the end of the basket when you do that). The small bubbler is really only there to re-aerate the solution after use, as it's quiet enough to leave on. | ||
=== 3rd Tank - stripper === | === 3rd Tank - stripper === | ||
