This circuit was found in a 90s EDN. Its purpose is to increase the efficiency of operational amplifiers. Power MOSFETs and inverted zeners support equivalents.
This is a common crystal oscillator configuration with 80s transistors. The circuit has the...
This CMOS integrated alarm was found in the July 1992 Radio Electronics magazine. The circuit has...
This circuit was found in an Electronics World of 1966. It has a range of 5 to 25 000 Hz at 1 dB...