Feb
26
Pulse Width Modulators using LM339
Posted by News
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 here.
Read More Source:
http://www.4qdtec.com/pwmmod.html
Thank you.
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Feb
25
Four-Channel PWM Controller
Posted by News
Author: John Giffard and Mark Lewin
The highly flexible Four-Channel PWM Controller is designed around the ATmega16L microcontroller. It has an RS-232 serial interface for computer control, a 12-button keypad interface, four 10-bit analog inputs, and an alphanumeric LCD interface (with backlight control). [source]
Four-Channel PWM Controller - [Download Project] [View Abstract]
Tags: controller, DIY, Electronics, LED, pwm