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DIY Vactrol
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Super simple DIY optocoupler - Adding optical isolation in electronic circuits - YouTube
DIY opto-isolator | LEDnique
Optocoupler Circuits | Nuts & Volts Magazine
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Photoelectric Beam Speed Sensor Module 3.3V-5V Slot-Type Optocoupler Tacho-Generator Counter For Arduino/51/AVR/PIC Diy Kit - ASK Electronics
Making a DIY Optocoupler : 4 Steps (with Pictures) - Instructables
Ask MAKE: Using an optocoupler - Make:
