This circuit can be adjusted between 0.2 and 2 V to trigger with chosen voltages comparing them with the input voltages. We found it in a 1967 documentation.
This circuit was suggested by Linear Technology in documentation from the 90s. The circuit applies to...
This 3-transistor buzzer or buzzer is a classic type found in the July 1998 issue of Electronics Now...
This transmitter can be mounted in an extremely small box, especially if SMD components are used....