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.
This circuit is based on an old Siemens integrated that can now be found very easily. It allows the...
This circuit, which operates between 7 and 30 MHz, was found in Radio Electronics from the 1980s....
Found in a 1960s RCA documentation, this circuit applies to most common triacs. The trigger device is a...