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 a Motorola manual. The circuit employs operationals that are uncommon today...
In the figure we have the way to use a voltage comparator powered by a voltage to control a...
CTS IoT Quartz Crystals Available through Mouser Electronics, CTS quartz crystals are especially suited...