A step generator circuit designed by Forrest Mims. Two oscillators give various tones capable of increasing/decreasing in equal "steps". This layout uses the 556 chip but it is possible to accomplish the same feat with two 555s. Forrest Mims is somewhat of a personal idol. He is/was just a regular guy like me without any real formal training who went on to have a successful career in electronics. Hes published several DIY books and journals and a lot of my work has directly stemmed from his projects.......just go check out his works.
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