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.
We found this circuit recent English documentation. The circuit uses a common transformer and can...
This 90's Electronic Design circuit converts the period of a signal into a frequency. The...
This circuit, shown in the figure, can operate from 4 to 100 MHz, based on a 2N2222 transistor or...