This simple circuit needs a high gain stage to compensate for losses. It consists of a passive tone control obtained from Electronics Today International of the 90s.
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...