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 very simple amplifier was found in the Philips Databook of 1990. The circuit is suitable for...
This interesting circuit was found in an English documentation. It generates sound similar to...
Indicated for telegraphy practice, this circuit was found in the Radio Electronics magazine of...