Despite having access to an oscilloscope, [Brian] aka [schoolie] has come up with his own method for measuring PWM period and duty cycle without a scope, just in case there’s ever a PWM emergency!

Looking at the circuit diagram, the "+12V" and "0V" terminals connect to the respective connections on the PSU Molex connector. The "FAN+" and "FAN-" connect to the corresponding +v and -v ...

(See Fig. 1.) Microcontrollers and DSPs often incorporate such PWM conversion circuits as on-chip peripherals to drive electromechanical components like brakes and motors.

3.4.2.2 The H-bridge The circuit that controls the electrical motor is known as the 'H-bridge' due to its resemblance to the letter 'H' (Figure 3.30). Through variation of the switching, as well as ...

For a given sample period, the area under the analog signal equals the area under the PWM pulse. The key principle behind the PWM is that a short pulse at maximum amplitude has the energy equivalent ...

To convert from analog to digital, the analog signal first is sampled at a carrier frequency. For a given sample period, the area under the analog signal equals the area under the PWM pulse. The key ...

Because it uses only six components, this circuit can be very cost effective. The LM431 can be purchased for as low as 10 cents in single-unit quantities, well below that of any op amp. Editor’s ...

The most common type of power supply today is the switching supply. These units use pulse-width modulation (PWM) to regulate output. Supplies today employ several different PWM circuit configurations.

So problem solved right? Well, sort of. It really bugs me that there’s an entire arduino there just for some PWM. I can go buy the components to do 555 timer PWM circuits if all I want is PWM.

In a basic implementation of the power-monitor circuit (Fig. 1), current passes from source to load through the current-sense resistor R1. In conjunction with R1, U1 provides an output voltage ...