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

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Tank Heater-  a PWM power controller used to control the temperature in a tank for a tarantula __ Contact P. Townshend - EduTek Ltd

The +12 V power supply-  Scroll down:  The small current parts ( not the motor itself) could be powered from a +12 V voltage regulator. Then the input voltage must be larger than +15  V. The regulator survives a current of maximum 1 A with a heatsink. __ Contact Pico Technology

Timer with 555-  Some useful circuits using the LM555 IC.  Scroll to find the Timer with 555 circuit __ Designed by Jose Pino

Transistor paIR lowers PWM IC's start-up current -  03/18/99 EDN Design Ideas:  An auxiliary winding usually provide as power for the popular  UC384X-based offline switch-mode power supplies (SMPSs).  This winding feeds  the main PWM controller. PDF contains multiple circuits, scroll to find this circuit. __ Circuit Design by Christophe Basso, Motorola Semiconductor, Toulouse, France

Two-channel audio Amplifier drives stepper Motor-  12/01/06  EDN Design Ideas:  Pulse-width-modulated stereo power amplifier saves components __ Circuit Design by Phill Leyva and Bill Quach, Maxim Integrated Products, Sunnyvale, CA

Unused Port Adds a PWM/Analog Channel to a Microcontroller-  8-Oct-09 EDN Design Ideas:  Take advantage of unused pins to generate a PWM signal and then filter it into analog __ Circuit Design by Vishwas Vaidya, Tata Motors Ltd, Pune, India

Use a 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

Use a PWM fan controller in an EMI-susceptible-  02/16/06  EDN Design Ideas:  Control it with either an external negative-temperature-coefficient thermistor or a PIC microcontroller and its SMBus serial-data bus __ Circuit Design by Dimitri Danyuk, Niles Audio Corp

Using a Function Generator to Create Pulse Width Modulation PWM Waveforms-  Application Note__ Aligent

Variable Frequency PWM-  Schematic only, no circuits description. __ Designed by Tony van Roon  VA3AVR

Video Design Idea: 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

Voltage Inverter Employs PWM-  07/14/11  EDN Design Ideas:  Use two diodes and two capacitors to generate a negative voltage.  This design idea   describes a circuit employing a small microcontroller-based sensor module with only three connections: 5V dc, an RS-232 transmit-data output, and ground.  A dedicated sing __ Circuit Design by Jeff Wilson, STMicroelectronics, Schaumburg, IL

VU & PPM Audio Metering-  A versatile and useful VU meter circuit, can also operate as a Peak Program Meter __ Designed by Rod Elliott  ESP

Wireless RF PWM Dual Motor Controller-  This is a very simple Wireless RF transmitter circuit that consists of the Holtek HT-12E encoder chip and AM 418MHZ-transmitter module ( WZ-X01, other similar device can be used).  Using the hybrid RF xmit/receive modules make building the RF remote control a lot easy __ Contact info @ wzmicro.com

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


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