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Power tool speed controller with power maintenance. Feedback via a current transformer. Finally, I made it. I can recommend this circuit for repetition with a clear conscience. It works! There are also much fewer problems with adjustment than in the previous version. Previous version: • Speed controller with power maintenance... City Slantsy Leningrad region. OK: https://ok.ru/profile/135494481527 VK: https://vk.com/id571605378 Callsign: R1CBD