Found in a 1947 publication, this 7-tube amplifier uses four tubes in the output stage. The circuit uses a power source with a transformer.
This circuit uses a LM3900 Norton amplifier and a 2.7 V zener diode to supply a current of 1 mA to...
This small MW transmitter emits its signals at a distance of a few tens of meters, depending on the...
This brightness control for incandescent lamps or engine speed has been found in a 1970 English...