This circuit rejects frequencies around 1 kHz and can be adjusted using C1. Equivalent operational amplifiers can be used, and the power supply must be symmetrical.
Found in an Electronics World of 1966, this circuit makes use of FETs of the time. Modern...
In the circuit of the figure, we have an application different from 4093. The astable...
This circuit was found in documentation from 1977. It consists of a bridge of capacitances using a 50...