This speaker overload protection circuit was found in Radio Electronics from the 1980s. The circuit uses a 9 V relay but can be powered by 12 V for a relay of this voltage.
Published in 1988 in Hands-On Electronics, this circuit converts the 12 V of a battery into 120 V...
This circuit was found in an American technical manual from the 1980s. The LM111 is an uncommon...
This circuit was obtained in an American publication of the time. Transistors are commonly used. The...