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.
This circuit was obtained in a 1991 Electronics Handbook. The publication no longer exists, but...
This circuit causes a buzzer to emit an intermittent tone when the temperature sensed by the...
This configuration from an American publication from the 1970s shows how to use a pair of power...