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.
This circuit is from Dutch documentation from 1967. The circuit works with a component of the...
This circuit can be used to add a delay to a logic signal as shown by the input and output...
We found this guitar effects circuit in a 1997 documentation. As the components used are still...