Second order active voice filter (CB7568E)

This filter for the 300 Hz to 3 kHz range was found in an American documentation from the 90's. The operational amplifier is a double 741.

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Timer with FET (CB13318E)
This timer for small intervals, but which can be increased with the increase of R1, was obtained in an...
Fiber optic receiver (CB9737E)
This circuit has a sensitivity of 2uW. We found it in documentation from the 1980s. The integrated...
TL3780 Touch switch (COM137E)
November 2016 - The TL3780 ultra-miniature E-switch touch switches can now be obtained from Mouser...