Electronic Designer № 4 "Optoelectronics" covers in its experiments a large number of modern optoelectronic components: LEDs, seven-segment indicators, photodiodes, photoresistors, optocouplers and more. If you have heard of such electronic components, but do not know where and how to use them, our Designer "Practical Electronics" will teach you this, and all the intricacies of working with them. As a result of 10 experiments, you will gain not only valuable knowledge, but also the opportunity to impress family and friends with their own products.