Voltage to frequency converter (CB8928E)

Found in ancient American documentation, this circuit uses an operational amplifier of the time, which is uncommon today.

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Touch switch (CB9377E)
Found in American documentation from the 90's, this circuit is very current and can be implemented with...
High Pass Filter for High Frequencies (CB12576E)
The filter shown in the figure can operate with frequencies up to several tens of megahertz thanks...
CMOS Touch Switch (CB9572E)
This is one of many possible touch switch configurations using CMOS integrated circuits. The...