This 80's circuit can be implemented with modern equivalent FETs with lower on resistance. The attenuation is 80 dB at 100MHz.
This simple circuit was found in Popular Electronics. It can be built with any JFET. Galvanometers from...
This circuit produces a sine 1 kHz signal. The frequency is given by C1, C2 and C3. This is a...
This circuit is interleaved with the source of a portable AM or FM radio previously tuned to a...