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 consists of a Step-Down converter (voltage reducer) that can provide a 5 A output with...
This circuit produces a IR beam with a frequency adjusted by the 100k pot. The circuit can be used in...
This simple current control setup was found in documentation from the 60's. The low current...