This circuit was obtained in a 90s documentation. However, it can be developed with modern operational amplifiers. The power supply must be symmetrical.
This 80's circuit, suggested in Texas Insrtruments documentation, uses a Hall effect sensor. The...
This voltage controlled oscillator, which can be used as a shield, generates signals in the 1.5...
This circuit was obtained in the publication 101 Electronics Projects of 1979. The circuit can be...