This circuit, found in 2002 documentation, triggers LEDs when a phone call is received. The LEDs will flash alternately in these conditions. Common LEDs are used in this circuit.
The operating voltage of this circuit is 18 V, and the source current is 3.5 A. The circuit is...
This circuit was suggested by National Semiconductor in its Linear Applications Handbook. The...
The basic idea of the circuit shown in the figure is to increase the brightness of an ordinary...