This circuit with TTL output was found in a 1968 EEE. The transistor can be of general use. The tunnel diode is an uncommon component today.
April 2017 - The new Maxim Integrated MAX20733 and 20745 switched regulators are available from...
This 1980s circuit uses components of the era that can be replaced by modern equivalents. For the FET we can...
Found in a 2005 Linear Technology application manual, this circuit monitors the current in a load...