Techniques

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Circuit board techniques

Toner transfer, Press-and-Peel(tm), photoresist, Sharpie, nail polish.

Ferric chloride vs. ammonium persulfate. How to dispose of etchant.

Commercial PCB fabrication. Vendors.

Construction techniques

Dead bug style. Manhattan style. Veroboard. Perfboard and point-to-point. Solderless protoboard.

Soldering techniques

How to use a soldering iron. What is flux for.

Hot air soldering.

Hobby replacements for commercial reflow: skillet soldering, toaster-oven soldering, soldering using an oil lamp or candle.

How to fix mistakes: solder braid, solder sucker.

How to deal with fine pitch SMT devices.

How to deal with big, heatsucking components.