This trimmer or reaper amplifier cuts the signal peaks at a voltage determined by the zener diodes. The gain is given by R1 and R1 and the power supply must be symmetrical from 5 to 15 V.
In the figure we have the way to linearize the response of a TTL port with the use of a feedback...
November 2016 - The TL3780 ultra-miniature E-switch touch switches can now be obtained from Mouser...
This circuit is from a 1967 US publication. The configuration can serve as a basis for designs...