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Opto-coupler / Opto-isolator made by Silonex. Consists of a yellow LED and a single CdS Photocell in a hermetically sealed package. A great item for experimenters and automation proto-typers. Also has applications in audio switching and music effects devices. Resistance of photocell measured between 1500 and 2100 Ohms when powering the LED. Off resistance measured greater than 6 MegOhms. Physically similar to NSL-32 coupler.