Features
Pinochle — Social Distance Style
What do you do when you can’t play cards together because of the pandemic? You figure out a way to do it electronically over Zoom!
Some Simple Transistor and IC Circuits
Two Nuts & Volts questions motivated me to relearn about bipolar transistors.
Take the Z80 Challenge
by Dan Gravatt
Take the Z80 challenge and build something that’s both classic and modern at the same time.
An Altair Clone: Then and Now
by John Horrocks
The resources available today compared to what was available in 1977 make all the difference in projects.
The Electric Brains of Yesteryear
by David Goodsell
Get Geniacs and Brainiacs from decades ago working again.
eTracer Digital Tube Tester and Curve Tracer Kit
by Bryan Bergeron
This time in our restoration series, we take on a digital tube tester and curve tracer kit.
Projects
Build the FLiPVox Laser Theremin
by Jim Arlow
Here’s an analog style laser Theremin with its own built-in synthesizer.
Build a Freezer Alarm Circuit
by Roger Secura
Save your food with an alarm that alerts you if the freezer’s open.
Updating a General-purpose Programming System
by Brian Beard
It was clearly time for an update to my LP120 that I originally built 20 years ago.
Build a Lunch Box Jukebox
by John Dennigan
Take your fun with you in an all-in-one entertainment system you build yourself.
Build an Instant Heart Pulse Sensor
by Eric Bogatin
Make your own version of a Fitbit of sorts for monitoring blood flow.
Build a $6 Desk Mic
by Bob Fischer
Turn a cheap LED lamp into a usable microphone.
Departments
New Products (04.2020)
Versatile DC Lab Power Supply, 4-CH Mixed-signal Oscilloscopes, Industrial Grade RF Coaxial Cable Assemblies, 6PC Fused Probe DMM Electrical Kit, High Power Dual Port AC/DC Charger, Rack Mount O'scope, Sunlight Readable LCD Display
Developing Perspectives
Increasing Complexity: Unavoidable?
by Bryan Bergeron
Why do experimenters always feel the need to make things better?
Reader Feedback (04.2020)
Comments from readers.
