In the figure we have a basic oscillator with inverters obtained from TTL, CMOS or other gates. The graph on the side allows to find the frequency depending on the resistor and the capacitor.
This simple tester was found in a Popular Electronics from the 90s. The circuit is powered by two 9 V...
This circuit was found in a PC documentation from 1996. It can be used as a shield with modern...
This limit alarm was found in a 1980s US documentation. Comparators can be equivalent and the...