This circuit operates with an AM radio tuned to or near 900 kHz if there is a station at this location. The coil consists of 60 + 40 turns 28 on a ferrite rod.
This circuit is called by radio amateurs Roger Beep, which is the beep that is heard when the...
This circuit is from a 1975 publication. The components are from the time, and modern equivalents can be...
This table with the antenna design allows to size the antenna according to the frequency of the...