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Pulse Width Modulators (PWM)
PWM Circuits:  # - G     H - O     P - S     T - Z


Last Updated: October 24, 2017 02:55 PM

Capacitance Proximity Switch
Draws very low power - Ideal for battery-powered applications
6 Models Available - Call 806-368-7747

Circuits Designed by Dave Johnson, P.E. :

Classic Linear 5v Supply using 6.3VAC Transformer - There are times when you wish to control a pulse width modulation (PWM) signal with a DC voltage, ranging from 0v to 5v.  This voltage is often created by a computer interface.  The circuit below performs this voltage to PWM conversion.  PWM signals are often . . . Hobby Circuit designed by Dave Johnson P.E.-October, 2010

Computer Controlled PWM Circuit - There are times when you wish to control a pulse width modulation (PWM) signal with a DC voltage, ranging from 0v to 5v.  This voltage is often created by a computer interface.  The circuit below performs this voltage to PWM conversion.  PWM signals are often. . . Circuit by Dave Johnson P.E.-October, 2010


Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

Handheld DMM Copes with Logic Nanosecond-Pulse-Width Waveforms-  20-Aug-09 EDN Design Ideas:  When testing sequential-logic circuits, you may find that, although the repetition frequency of a logic signal is within the range of your DMM (digital multimeter], you canít measure it.  The displayed frequency value is either dubious or chaotically changing in time.  The DMM may also behave as if there were no signal __ Circuit Design by MariŠn Stofka, Slovak University of Technology, Bratislava, Slovakia

H-Bridge with PWM-  This circuit drives a motor clockwise / anticlockwise via a pot and reduces the speed to zero when the pot is in mid-position.  The current is limited to 200mA and the voltage across the motor is less than 6v, but the circuit shows the principle of Pulse Width Modulation ( providing powerful bursts of current to the motor to create a high or low RPM under load) and both forward / reverse RPM via the H-bridge arrangement. __ 555-Timer

Heater Fan Controller-  This device acts as a variable speed control for the heater blower in a car.  It takes its power directly from the existing wiring and connects with just 2 wires.  It will also work for any 12 volt device up to 10 amps __ Designed by Luhan Monat-Mesa Arizona

High side PWM Motor/Light Controller-  The diagrams are for 12V operation only and there are high side ( common ground) and low side ( common +12V) versions.  The low side version of the circuit uses an N Channel FET, the high side version of the circuit uses a P Channel FET.  N Channel devices tend to handle more current than P Channel devices, they are also less expensive.  The high side version of the circuit is useful when one side of the load has to be grounded __ Designed by G. Forrest Cook

Isolated PWM Suits Low Frequencies-  04/07/11  EDN Design Ideas:  Use a voltage-controlled PWM chip to increase low frequencies while preserving the duty cycle.  Many industrial- and medical-system circuits require isolation from the mains-ac power.  You can often send a signal across the isolation barrier using a small transformer; transformers do not pass low-frequency signals well.  The circuit in this Design Idea converts a low-frequency PWM (pulse-width-modulated) signal to a higher frequency, which you pass across the transformer, and retains the duty cycle. __ Circuit Design by Tim Regan, Linear Technology, San Jose, CA

LED Moving Sign 7 x 10-  This sign uses two LED arrays to form a 7 X 10 matrix.  It produces moving messages or animations stored in an EPROM.  It uses no microprocessor. As in most electric signs, the LEDs are matrixed, and strobed very quickly. __ Designed by Bob Blick

Leverage PWM output & add a low-cost DAC to your system-  07/19/07 EDN Design Ideas:  Bonnie Baker demonstrates a simple way to add DAC functionality to a microcontroller-based system using only an op amp and two passive components __ Circuit Design by Bonnie Baker, senior applications engineer at Texas Instruments and regular EDN columnist

Light Controller High Side-  The diagrams are for 12V operation only and there are high side ( common ground) and low side ( common +12V) versions.  The low side version of the circuit uses an N Channel FET, the high side version of the circuit uses a P Channel FET.  N Channel devices tend to handle more current than P Channel devices, they are also less expensive.  The high side version of the circuit is useful when one side of the load has to be grounded __ Designed by G. Forrest Cook

Li-Ion Charge Termination IC Interfaces with PWM Switchers-  DN242 Design Notes __ Linear Technology/Analog Devices

LM324 Pulse Width Modulator-  Schematic only, no circuits description. __ Designed by Tony van Roon  VA3AVR

Low side PWM Motor/Light Controller-  The diagrams are for 12V operation only and there are high side ( common ground) and low side ( common +12V) versions.  The low side version of the circuit uses an N Channel FET, the high side version of the circuit uses a P Channel FET.  N Channel devices tend to handle more current than P Channel devices, they are also less expensive.  The high side version of the circuit is useful when one side of the load has to be grounded __ Designed by G. Forrest Cook

Low-Cost PWM ramp generator in switch-mode power supplies-  04/08/10 EDN Design Ideas:  Include this circuit in a switching-power-supply design. __ Circuit Design by Dwayne Reid, Edmonton, AB, Canada

Low-power PWM is simple, inexpensive-  01/06/00 EDN Design Ideas:  A common technique for implementing PWM involves comparing a triangular waveform of fixed amplitude and frequency with a variable dc voltage level.  Although this approach results in a PWM signal of precise frequency and with duty __ Circuit Design by Anthony Smith, Scitech, Biddenham, England

LTC Design Note: Accurate, fast settling analog voltages from PWM signals-  EDN Design Ideas:  05/31/2016  A unique IC mitigates the disadvantages of PWM DACs __ Circuit Design

Make a DAC with a microcontroller's PWM timer-  09/05/02 EDN Design Ideas:  Many embedded-microcontroller applications require generation of analog signals.  An integrated or stand-alone DAC fills the role.  However, you can often use PWM signals for generating the required analog signals.  You can use PWM signals to create both dc and ac analog signals.  This design idea shows how to use a PWM timer to simultaneously create a sinusoid, a ramp, and a dc voltage __ Circuit Design by Mike Mitchell, Texas Instruments Inc

Maximize Pulse-Width-Modulated DAC Throughput-  03/22/13  EDN Design Ideas:  This ramp-based DAC uses microcontroller-generated clocks and a sample-and-hold.  Simple DACs realized by lowpass filtering microcontroller-generated pulse-width-modulated (PWM) signals have a response that is typically a tenth of the PWM frequency.  This Design Idea is a novel implementation of a previously published method1 employing a reference ramp whose output is sampled and held by the PWM signal.  This approach results in a throughput rate equal to the PWM frequency. __ Circuit Design by Ajoy Raman

Modulator's Design Cuts FPGA's Gate Count-  01/06/94 EDN Design Ideas:  The pulse-width modulator (PWM]macro in Fig 1 requires only half as much logic as a conventional 2-counter design.  With the help of extra logic, a synchronous, loadable up/down counter can encode information in the duty cycle of a constant-frequency, constant-amplitude signal __ Circuit Design by Bernie New, Xilinx, San Jose, CA

Monolithic PWM generator runs fast, minimizes silicon-  EDN Design Ideas:  11/17/2014   This analog-based PWM generator Design Ideas - does away with amplifiers and comparators to minimize space and power __ Circuit Design  Jindrich Windels , Ann Monte & Jan Doutreloigne

MOSFET driver 1-  Scroll down: This was the first MOSFET driver used by the author. But driver two is better. __ Contact Pico Technology

Motor PWM-  The speed of a motor can be adjusted by this circuit, from 5% to 95%. __ 555-Timer

Nanosecond-Width Pulse Generator Provides High Performance-  11/11/04  EDN Design Ideas:  If you need to produce extremely fast pulses in response to an input and trigger, such as for sampling applications, the predictably programmable short-time-interval generator has broad uses.  The circuit of Figure 1, built around a quad high-speed comparato __ Circuit Design  Jim Williams, Linear Technology Corp

NE555 Pulse Width Modulator-  This circuit is capable of regulating 12V motors and DC light bulbs.  No coolrib required for Q1 or D3 if the current does not exceed 2A.  If it does, a sufficient coolrib for both the Schottky Diode ( D3) and MOSFET Q1 is required __ Designed by Tony van Roon  VA3AVR

One-Shot Remembers Input-Pulse Width-  07/18/96  EDN Design Ideas:  The circuit in Figure 1a remembers the width of an input pulse at the in terminal.  After the input pulse returns to zero, a trigger input causes an output pulse to occur at the out terminal.  This output pulse is proportional to the width of the input pulse.  R2 and R3 set this pulse-width ratio.  For the values shown, the output pulse is half __ Circuit Design by Ray Kauffman, Electronic Devices Inc, Chesapeake, VA


PWM Circuits:  # - G     H - O     P - S     T - Z

 


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