By applying a small voltage ... circuit on a breadboard, and with a little tweaking managed to get a fairly respectable amount of gain from parts salvaged from a radio. While using VFDs as ...

There is no set number of watts in an amp, as the number is determined by the circuit's voltage. A 12-volt circuit with a ...

After a brief review of the history of the K2-W vacuum-tube op amp, an LTspice model is used to create its schematic in ...