The operational 714 (not the 741) is an old Raytheon type that is no longer common today. The circuit can be implemented with modern operational. The power supply must be symmetrical.
In this 1990s circuit, found in a National Semiconductor manual, the output voltage is the square of...
This mains-synchronized circuit produces a simple 1 pulse per second. The circuit is from a Radio...
August 2017 - Mouser Electronics already has the Connect One Pico WiReach ™ SMTS Pico modules...