This circuit was found in documentation from the 1970s. It eliminates contact bouncing, providing a single pulse. PUT is not a common component today.
This circuit was found in a 1977 documentation. It limits the voltage from a source using zener...
This simple radio uses few components due the direct coupling of the transistors. Coil is formed...
In the figure we have the way to implement an Exclusive OR or XOR gate with CMOS or TTL...