This circuit was found in documentation from the 1970s. However, it can be implemented with modern transistors such as 2N2222 for Q1 and BF494 for Q2. The crystal depends on the desired frequency.
This circuit was found in an old American publication. It is valid for any operational. Formulas for...
This circuit can be used as a signal when powered by a car battery, as it also works with 12 V, or...
This shift register was found in old documentation. PUT is not a common component today. The...