This circuit is intended to switch high frequency antennas using common diodes. The circuit is from an 80's documentation appearing in other versions in this same section of the site.
This circuit is a handset receiver that picks up the signal emitted by a coil under the rug or...
This circuit uses a resonant reed relay to recognize the frequency of an input signal. Adaptations...
White noise applied to an audio amplifier can be used as a relaxant, since it resembles the noise...