set2: 10 x Photo Coupler + 10 x voltage comparator Item No.: LM393N Low Current Supply: 0.4 mA Low Input Bias Current: 25 nA Size (L x W x H): . 9 x 9 x 7 mm 4 pins, dual row, 2.54mm pitch. Used widely in computer terminals, system appliances, measuring instruments, registers, copiers, automatic vending machines, electric home appliance, switching power supply, etc. LM393N high-precision low-power voltage comparator, the offset voltage is caused by temperature drift. The LM393N voltage comparator supports single power supply and is compatible with logic circuits. This LM393N voltage comparators are equipped with low power consumption. Description: wide operating voltage range: 2.0V to 36V (for a single person power), +/- 1 V to +/- 18V (for dual power supply) low input offset current: +/- 5nA Max. input offset voltage: +/- 3 mV Product Name : Photo Coupler Model : EL817 Material : Plastic, Metal Pin Number : 4 Size : 8 x 4 x 7mm/0.3 inch x 0.2 inch x 0.3 inch (L x W x H) Pin Pitch : 2.54mm/0.1 inch Package Contents: 10 x Photo Coupler 10 x voltage comparator Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.