This simple tone control using two transistors was found in an Electronics Today International of the 90s. Transistors are general purpose NPN types, like the BC549 for greater gain.
This 1980s circuit uses components of the era that can be replaced by modern equivalents. For the FET we can...
Delivering Over 4X More Battery Life and Faster Time to Market, Platform Comes Complete with...
This is a traditional version of electroscope with FET. We found it at Popular Electronics. The...