Category Archives: Tools

CircuitJS

Posted on 2026-09-30 by M. Eric Carr

CircuitJS is a useful, free, education-friendly circuit simulator with nice intuitive voltage/current visualization.
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Posted in Analog, Digital, Electronics, Internet, Resources, Tools | Leave a comment

Digilent Analog Discovery 3

Posted on 2026-07-31 by M. Eric Carr

Digilent’s Analog Discovery 3 is a very useful, versatile portable basic electronics lab — if perhaps a little pricey. Continue reading →

Posted in Analog, Tools, Toys | Leave a comment

Mini Museum: Cisco 2500 Router

Posted on 2026-01-15 by M. Eric Carr

Cisco routers, particularly the Cisco 2500, helped make the Internet what it is today. Continue reading →

Posted in Digital, Internet, Networking, Nostalgia, System Administration, Tools | Leave a comment

Bus Prognosticator

Posted on 2025-11-30 by M. Eric Carr

A Bus Prognosticator, to show estimated time until the next inbound SEPTA bus. Continue reading →

Posted in 3D Printing, Arduino, C, Networking, Projects, Tools | Leave a comment