This circuit, found in a 1958 magazine, is for reference only, since the components are not easy to find today. The transistors are germanium types and power supply is made by common cells.
The focused circuit was found in the National Semiconductor's Linear Applications Handbook of...
This circuit was found in a 1964 Electronic Design. The circuit makes use of transistors of the...
This circuit was suggested by Texas Instruments in a 1980s documentation. The transistor must be...