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 circuit was found in an Electronics Now of the 90s. It is intended for amplifying composite...
We found this circuit in an American 80's documentation. The resistors must be of high precision...
MXT1665T-A Family from Microchip Brings the User Experience of Multi-Touch HMI into the VehicleCHANDLER,...