This circuit was found in an Electronic Design from the 90s. Operational amplifiers admit modern equivalents.
A tap on sensor X1 of the circuit shown in the figure causes the flip-flop formed by the 4 NAND...
This circuit is from old documentation. Based on two operational amplifiers of the time, it can be...
Ohmite TGHD non Inductive High Power Resistors Available in SOT-227 enclosures, these Ohmite...