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Build Your Own ECG-EKG Unit
For parts costing less than $50, I built an ECG-EKG unit that plugs into my laptop computer’s microphone input jack.
Build a Sump-Fill Level Controller
Need to monitor the high or low level of a fluid? Choose from these two versions of a sump/fill level monitor/controller.
Low Cost PC Two-Channel Oscilloscope
Build an easily portable and cost-effective two-channel oscilloscope that hooks up to a PC.
Universal Oscillator Topologies and Applications
Explore and analyze several circuits that you can use to make light dimmers, PWM motor speed controllers, model train controllers, heater controls, and a host of other applications.
Build a Personal Guitar Microphone Pre-Amp
Fine-tune the sound for your guitar just the way you want it with this handy device that will also work with Karaoke machines, boom boxes, and surround sound systems.
Arduino PID - Laser Rainbow Machine - IoT Sump Pump - All About Ferrite
Synchronizing a 60 Hz CCO to the Line, and More!
Selected questions from past Q&A columns.
Need to brush up on your electronics principles? These multi-part series may be just what you need!