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By Dr. Martin Oppermann (Germany) & www.elektormagazine.com
In his article published in the July & August 2016 issue, Elektor author Alfred Rosenkränzer presented a wonderfully simple differential probe for oscilloscopes, based around the AD8479 precision differential amplifier. I built one of them immediately and found it particularly suitable for measurements in the audio range, for example. But one small detail was not covered in this article: the power supply used for the probe (or for several of them). Practically all modern oscilloscopes have a USB port on the front panel for data output. Since the power consumption of a probe is very low, it makes sense to use this socket to power the probe. Figure 1 shows the schematic of the circuit I decided upon.
Oscilloscope Differential Probe USB Power Supply – [Link]
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