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.
The circuit transistors, found in a 1974 documentation, may be the BC548. The circuit is used in...
This circuit was found in a Linear Technology manual from the 1990s. The circuit makes use of the...
This circuit uses a general-purpose transistor and has waveform adjustment. We found it in an...