This circuit consists of two stages that each shift 180 degrees the signal. The circuit was proposed by Siliconix in a 1966 publication. Equivalent FETs can be used.
We found this circuit in a documentation on active filters from 1977. The gain of this circuit is...
The touch sensor of this circuit consists of a single plate that must be touched to obtain an...
The integrated circuit used in this project is not common today, as it was obtained in the Linear...