Suggested by an American publication, this circuit has 5 operating conditions indicated in the diagram. The circuit can be designed based on modern equivalent transistors.
Decade counters, such as the 4017, can be cascaded as sourcing signals with the frequency divided...
This is one of the possible transistor preamp configurations in the common emitter configuration. The...
Using an operational amplifier, this circuit from a 90s Popular Electronics, is characterized by its high...