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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 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. 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 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 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 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. 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 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 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 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 Design by Ray Kauffman, Electronic Devices Inc, Chesapeake, VA
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