Replacing The 555 With A PIC — Part 2 — A Digital Analog
Learn how to emulate a 555 or 556 using a PIC microcontroller — with no special programming required!
A2D Signal Processing
One of the limitations of many low cost, single supply, analog-to-digital (A/D) converter ICs today is that they have a limited input voltage range. This article discusses various ways to implement input processing to allow these devices to operate in the real world. I use the ADS7870 as an example A/D, but the equations and samples are generic enough so that you can configure the circuits for other devices...
Audio Spectrum Analyzer
The device described in this article is a configurable audio spectrum analyzer. Many of you have probably seen spectrum analyzers on some higher-end audio equipment, as well as within the GUI of many audio deck programs on your PCs. The function of a spectrum analyzer is to view the frequency components of a signal. One way to state the difference between an oscilloscope and a spectrum analyzer is that with an oscilloscope, you see time domain presentations; with a spectrum analyzer...