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 photosensor integrated circuit used in this circuit is not common today. It is a device that...
May 2017 - The new series of new polymer conductive capacitors from Panasonic OS-COM is already in...
The circuit in the figure is suggested by Texas Instruments in its optoelectronics manual and...