Found in a modern design book with tubes, this stage with the triode 37 has a plate current of 3.7 mA.
This source was obtained from a former publication for valves but also serves for powering common...
This circuit, found in a publication of the year 1968, uses a MOSFET at the input to increase...
We found this circuit in a 1986 documentation. It uses only LEDs, batteries, resistors and the...