555 timer as a voltage controlled oscillator, duty cycle query - Electrical Engineering Stack Exchange
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digital logic - Divide clock frequency by 3 with 50% duty cycle by using a Karnaugh Map? - Electrical Engineering Stack Exchange
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PWM Generator in VHDL with Variable Duty Cycle - FPGA4student.com
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Flip-flop (electronics) - Wikipedia
Variable-duty-cycle scheduling in double-edge-triggered flip-flop-based high-level synthesis | Semantic Scholar
D-type Flip Flop Counter or Delay Flip-flop
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