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.
The circuit in figure 1 is a dynamic test for FETs. The characteristic of a FET is displayed in...
This circuit is an isolated shield for microcontrollers such as the Arduino, MSP430, PIC and...
In the figure we have the way to implement a monostable with a comparator 139, 239 or 339. The...