Found in a modern design book with tubes, this stage with the triode 37 has a plate current of 3.7 mA.
This circuit is from an ancient American documentation. The coil is frequency dependent and the...
Found in an 80's Elektor, this circuit can control loads up to 750 mA with the BD139 and 100 mA...
This circuit converts negative logic signals to positive logic signals. We found it in 1969...