We found this circuit in a Radio Electronics from the 90s. Transistors admit current equivalents, especially the power one that is not a common type today.
This circuit lets through the 300 Hz to 3kHz range that corresponds to the human voice. We found it...
This complementary circuit increases the output power of an operational amplifier. Outputs with...
In the figure below we have an interesting circuit for those with a project that requires a...