With this circuit of a Popular Electronics from the 90's it is possible to test a diode with the oscilloscope visualizing its characteristic curve. The transformer can have currents starting from 100 mA.
Found in a 1968 Electronic Design, this circuit is intended for suppression of trigger noise in...
We found this circuit in a publication from the 1980s. The circuit can still be easily implemented...
This circuit includes a battery charging system and an inverter for operating a fluorescent lamp....