Can produce circuits within the range of 1-99% duty cycle of the digital set-precision PWM wave


Posted on Dec 11, 2010

Dien stone crystal oscillation circuit CM OS inverting clamor ways to ensure work as accurate because it uses a BCD counter Wong (IC2, hi) so maximum oscillation frequency equa


Can produce circuits within the range of 1-99% duty cycle of the digital set-precision PWM wave
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ls 2MHz (100 times the required frequency of 20kHz) o assume IC, each output 100 clock pulses to trigger a flip-flop IC7 0 reset do j hit with a comparator IC (IC4,5) setting: a duty cycle reaches the set value, when the clock pulse count is terminated, reset circuit, so, IC., has set an output value equal to the duty cross-shaped. Resolution 1% increments, and very stable.




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