This circuit is from an old Popular Electronics, but it can be easily implemented nowadays, even adapted to act as a shield. The circuit has the frequency given by C1 and adjusted in R1.
The circuit shown in the figure is similar to the previous one (CB16096E), except that two...
We found this circuit in a Radio Electronics from May 1966. The sensor is a photocell, and the...
This circuit amplifies RF signals up to more than 100MHz and can be used as a booster in...