This interesting 1924 triode tube receiver was found in a documentation by Gernsback. Observe supply voltages. Coils are for tuned wavebands.
This 1992 circuit was designed to operate with the CB16766E circuit auto alarm. The circuit...
Nixie-type displays are no longer used except for assemblies of people who like old technology. The...
We found this circuit in a 2006 documentation. The circuit has two parts: a base where we have the...