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39 lines
1.4 KiB
Markdown
39 lines
1.4 KiB
Markdown
10 months ago
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---
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layout: post
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title: "Building a COSMAC/RCA CDP1802 learning computer"
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date: 2024-05-01 13:00:00 +0200
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comments: true
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categories:
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---
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# PCB making
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## Printing the transfer
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I tried several methods to prepare the toner transfer intermediate:
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* baking parchment paper with double sided tape
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* glossy magazine with scotch tape
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* glossy magazine with glue
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What seemed to work best is the glossy magazine glued to a sheet of paper strong enough to not have irregularities.
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:warning: Don't forget to mirror the image before printing :facepalm:
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## Preparing the board
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Grain #500 sandpaper -> steel wool -> acetone
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## Transferring the toner
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* **1st attempt** (glossy paper taped to carrying paper, max heat, 1.5 min): **failure** the paper sticks to the PCB, no transfer
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* **2nd attempt** (parchment paper glued to carrying paper outside of printing zone, max heat, 3 min moving across surface, let cool): much better, good enough for silkscreen but probably not for etching
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* **3rd attempt** (glossy paper glued, pre-scrubbed with isopropanol):
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* very good print, almost no defects
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* transfer with acteone/alcool (3:8): total failure, did not stick to copper at all.
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* parchment paper, taped to carrying paper on all sides (outside of printing zone), pre-cleaned with isoprop
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* iron 2 min on each part of the surface, temp setting 2, lots and lots of pressure
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* let cool completely
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* transfer failed :-(
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Looking for a laminator...
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