This simple radio was found in a Popular Electronics from the 90s. L1 and L2 have 100 turns on a toroidal core and L1 have a socket on the thirtieth turn.
This two-door doorbell was found in a 1990s US publication. The circuit is still current as...
Suggested by Intersil in documentation from the 90's, this circuit is valid for modern operating...
We found this circuit in an old RF documentation. The circuit must employ RF transistors and the...