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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.
StroboDuino - Generating Sine Waves - PIC Analog Comparators
Pi Photo Booth - Substitution Box - Rock Ola Amp Rebuild
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!