Found in a 1924 publication, this 2-valve receiver has a speaker output. Power comes from several batteries. Information about the coils is given.
This circuit was found in old documentation, but the setting applies to any operational. Resistors...
We adapt this circuit of Radio Electronics - March 1990. The magazine no more exists, but the...
The circuit of the figure consists of a motor timer that can delay drives for up to 15 minutes....