Based on the LF256 operational amplifier, this circuit was found in the September 1989 issue of Radio Electronics magazine. The indicator is analog, and the power supply must be symmetrical.
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...