We found this circuit in an old oscilloscope publication. With it, it is possible to observe the B / H curve (hysteresis) of an inductor in a common oscilloscope.
This circuit was originally recommended to operate with the emitter of the previous circuit but...
When the probes of this circuit meet water, the relay closes its contacts. The circuit is from a May...
The power supply shown can supply voltages of approximately 0 V to 12 V with a maximum current of 4.5 A,...