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.
Based on the BA1404 integrated circuit, this circuit was found in the July 1992 issue of Radio...
The operational amplifier used on this 1968 circuit is not common today. However, the setting can be...
This circuit operates with frequencies from 0.5 to 400 MHz. We find it in a 90’s NASA...