This circuit was found in documentation from the 80s. It is based on unijunction transistors not very common today being synchronized by the 60 Hz power grid.
This circuit is nothing more than a powerful audio oscillator or buzzer with a power transistor. The...
This wired intercom circuit was found in a March 1965 Radio Electronics. The circuit uses two...
This circuit is from an 80's American documentation. The circuit uses components of the time which...