One of many possible configurations of a small transmitter that transmits signals from a record player to a nearby AM radio. The circuit is powered by the power grid and has a range of a few tens of meters. The circuit is from a 1946 publication.

One of many possible configurations of a small transmitter that transmits signals from a record player to a nearby AM radio. The circuit is powered by the power grid and has a range of a few tens of meters. The circuit is from a 1946 publication.