This circuit, obtained from a 1965 magazine, can still be assembled using some modern equivalent components. The transistors may be BC558 and the transformer is obtained from a disused transistor radio.
This circuit was found in Siliconix documentation from the 1980s. Equivalent operational...
We found this dynamic tester for transistors with variable collector current in a publication in...
This circuit found in Popular Electronics from July 1974 consists of an oscillator that sends its...