Simplest transistor based PWM controller
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New simplest PWM generator WITHOUT 555 timer IC (improved version using ONLY transistors!!)
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How PWM works | Controlling a DC motor with a homemade circuit
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PWM 555 power controller
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How to make a simple delay circuit
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Super Easy 555 Timer PWM Generator
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Using the 555 Timer
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Designing UniStep - an open source UNIPOLAR stepper motor driver!
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