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A true lifestyle saver. This circuit detects when the soil is too dry and triggers a buzzer. It’s a perfect weekend project for plant lovers.

Whether you are looking to build a simple LED flasher or a complex PWM controller, a guide is a worthy addition to your digital bookshelf. It serves as a quick reference guide and a source of inspiration for your next project.

Simple memory cells and "push-on/push-off" power buttons. Highlights of the "Hot" 100 Circuits Collection