This circuit activates a buzzer when the voltage applied to the input falls below a preset value in R1. The circuit is from an 80's American documentation.
This step uses germanium transistors such as the AC151, GE2, and others having been found in a...
This circuit was obtained in an Electronic Design from the 80's. It has the adjustment of the gain...
We found this high input impedance, low output impedance amplification stage in the October 1993...