Note: This post was last reviewed for content and links on 2/23/2026 Ron Fredericks writes: I have completed the design and test of a new component for LTspice SwitchCAD III circuit simulation and schematic capture In a previous post I discussed my interest in the 4193 presettable synchronous 4-bit binary up/down counter IC for a…
Note: This post content and links have been reviewed and updated 2/23/2026 Ron Fredericks writes: recently I discovered that I was going to have to create my own IC component and symbol for my on-going digital volume control circuit simulation. My first step was to check in with the LTspice forums on Analog Devices website….
Note: This post has been reviewed and updated for content and links: 2/23/2026. Ron Fredericks writes: I was designing a simple CMOS timer circuit around a 555 chip this evening. It might be the heart beat for a new digital volume control I have been thinking about. Normally I look for my breadboard and parts…
Abstract [tag]Ron Fredericks[/tag] writes: [tag]Engineer[/tag]s want to build compelling products that meet their [tag]project[/tag] [tag]requirements[/tag]. Corporate [tag]executive[/tag]s want to [tag]invest[/tag] in innovative people that build products that, in turn, meet their market’s window; while, both want to stay within [tag]budget[/tag]. Yet both groups may feel overwhelmed with the prospect of expressing the very heart of…
Note: This post has been reviewed and updated for content and links: 2/24/2026. Ron Fredericks writes: The HHP-16K EPROM Emulator allows application code to be read by Hewlett-Packard’s (HP’s) HP-41 calculator. Instead of inserting a small pre-built module into one of the four module bays of the calculator, such as the PPC ROM module discussed…
[tag]Ron Fredericks[/tag] writes: In my last two posts: I discovered [tag]Dean Lee[/tag]’s [tag]Code Highlighter[/tag] plugin for [tag]Wordpress[/tag] as the blogging solution for my source code display needs. I fixed a word wrap problem in Dean’s plugin. During my research to solve the word wrap problem, I discovered a few more issues leading me to update…
Photo by Ron Fredericks using Canon EOS-10D 34mm fluorite lens, circular polarizer, 1.5s & f/22 @ ISO 100, on tripod, from Embedded Components’ HP lab collection. [tag]Ron Fredericks[/tag] writes: I envision the day when [tag]community[/tag] [tag]software[/tag] [tag]engineering[/tag] [tag]projects[/tag] are commonplace for [tag]embedded device[/tag]s. Like the PPC ROM demonstrated back in 1981. What follows is a…
