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.
Found in a Radio Electronics we have in the figure a circuit to disconnect an SCR with direct...
This Harris circuit from the 90's is intended for recording old EPROM memories. The circuit uses...
This circuit simulates a unijunction transistor trigger with two bipolar transistors. The circuit...