This inductance bridge uses an external audio signal. The circuit is from a Radio Electronics from January 1966. The instrument can be a common multimeter in the lowest current range.
Using transistors at the time, this circuit was found in a 1967 Ferranti documentation. The...
These circuits were found in Exar documentation from the 90s. The circuits use both a small...
Found in Radio Electronics, this circuit is intended to activate the lighting system of garages...