Tag Archives: PWM

Pulse width modulator by LM3524

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* use a large surface ground track/fill for this circuit, otherwise the LM3524 will not work reliably! * mount the two potentiometers through the enclosure, as shown in the picture on the start of this page (these pots are used to control the frequency and duty cycle) * the driver… Read more »

Pulse Width Modulators using LM339

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The first example uses the standard op-amp oscillator circuit to generate a triangular waveform which is level-shifted and fed to a comparator (e.g. LM339) to give the PWM waveform. Most people will want to use two comparators rather than one op-amp and one comparator so that is what we show… Read more »

Pulse Width Modulation DC Motor Control by 4011

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Often, people attempt to control DC motors with a variable resistor or variable resistor connected to a transistor. While the latter approach works well, it generates heat and hence wastes power. This simple pulse width modulation DC motor control eliminates these problems. It controls the motor speed by driving the… Read more »

LED flasher 2 by PIC16F84

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This flasher moves, while lighting of LED drags on. The brightness of LED is four kinds, bright, less bright, almost dim and dim. These lighting states are moved with time. Control of brightness is performed in lighting time of LED like PWM(Pulse Width Modulation). There is no PWM function in… Read more »