Using a standard multimeter, this circuit from a 73 magazine for radio amateurs provides an output proportional to the inductance under test. The circuit is TTL and must be powered with 5 V.
We found this chopper circuit in a 1967 publication. The transistors are of the time, and current...
This lock-up alarm circuit was found in a 1990s Radio Electronics magazine. The sensors are...
This circuit was obtained from the 2005 Linear Technology component manual itself. The output...