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.
We found this circuit in an old documentation, but the components used offer no difficulty in obtaining...
This project was found in a 1982 publication. It is a small transmitter that can send signals from...
The circuit in the figure can be used to trigger a triac or even a comparator in a project that...