Phone noise canceler (CB9402E)

This circuit was found in a 1967 American documentation. The circuit uses components of the time, applying to analog lines.

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Touch switch (CB21299E)
Found in American documentation, this switch is based on the 4093. The load will determine the...
DRV5032 Hall Effect Sensor - Texas Instruments
September 2017 - Texas Instruments DRV5032 Hall Effect sensors, an ultra-low power digital switch...
15W Transistor Amplifier (CB1320E)
The circuit presented was found in a European publication of the 1980s. Used transistors are not...