This 1924 receiver uses a battery for the tube filaments and a high voltage battery for the amplifier and detector circuit. The speaker is kind of high impedance era.
We found this circuit in a Harris Semiconductor Databook of 1977. The circuit can be implemented with any...
The inverter circuit shown in the figure can be used to power a fluorescent lamp in an emergency...
This circuit was found in an American documentation two years 80. The MOSFET is of double port,...