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.
Found in a Hands On Electronics from the 90s, this circuit can be easily assembled today, as the...
I found tis circuit in na old documentation from 1958. The circuit uses germanium transistor...
This is the basic configuration of a CMOS 4027 integrated circuit as a flip-flop. The circuit can...