This circuit was found in a 1964 Electronic Design. The transistors are of the time, but can be employed as modern equivalents. The system is for car with contact breaker.
This simple tone control using two transistors was found in an Electronics Today International of the 90s....
This circuit has a general-purpose transistor to compensate for the non-linearity of the generated...
This circuit appears in other configurations on this site. Its purpose is to operate a small water...