We found this circuit that protects speakers against current surges that occur when the amplifier is turned on in a Radio Electronics from August 1991.
Found in a 1968 US publication, this circuit can operate on any power grid. The thickness of the wire...
This circuit for cars of the time was found in a Popular Electronics magazine from the 90s. The...
This high Q “rejector” or notch filter rejects signals whose frequencies are in the range...