This circuit, with a 12 V input, was found in a Popular Electronics from the 1990s. Information is given about the ferrite-wrapped transformer. The transistor must be mounted on a heatsink.
This 500 V line current monitor with the LTC6101 was obtained from Linear Technology's own 2005...
This solar powered circuit was found in a 1991 documentation. The transistor is a general purpose...
This circuit for measuring bridges was found in the October 1995 issue of Electronics Now...