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
Using the proper circuit topology for your particular application is paramount!