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.
This circuit generates a sinusoidal signal with only -80 dB THD. The circuit was found in a 90's...
This test, the commercial transistor tester, had its diagram published in an article in Radio...
This circuit can supply voltages in the range of 8 to 20 V with a maximum current of 3 A. The...