This circuit, which can act as a shield, was found in a 1990 PE Hobbyst Handbook. The circuit generates logic pulses for different types of applications.
This circuit was found in a Popular Electronics from the 90's. The transistors are general-purpose types...
This circuit was found in an English magazine from August 1982, but it can be easily assembled with...
You can measure capacitances across a large range of values using the AC Power line frequency as...