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Page 5: Pulse-Width Modulation (PWM) allows for electronic control over DC motor speed or LED brightness. This articles features schematics and photos of circuits for making PWM without a microcontroller, but instead uses a 74AC14 logic inverter chip, diodes, a capacitor, and potentiometer. Speed control of dc motor using 555 timer pdf Pambula Beach Such circuits can be constructed using either two 555 timer ICs or a single 556 Dual timer, which is really two 555s in a single package. In the circuit shown in Fig. 4.6.1 the duty cycle can be adjusted without any effect on the output frequency, making the circuit useful as a pulse width modulated motor speed control or LED dimmer.

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