We had found this circuit in a January 1961 Radio Electronics Magazine. Using it is possible to take measures from the gain of transistor with a common a multimeter.
Found in an Electronics Now from the 90s, this circuit with the 555 generates a signal with 50%...
Frequencies from 1 to 10 MHz can be obtained with a small adjustment of the variable in a narrow...
This is a multi-component tester with visual indication by LED and polarity selection in the test....