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.
This Vox or sound activated relay was found in an American documentation from 1975. Equivalent...
April 2017 - Littelfuse's new two-way discrete TVS diodes for protection against ESD up to 30 kV...
This circuit is from Mullard documentation from 1969. Transistors support current equivalents. Output...