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I've used a number of different buck converters to experiment with small solar panels.  Since this is a relatively short challenge I decided to modify an existing converter circuit rather than trying to design and build a new one.  Here is the buck converter circuit that I'm going to use:     It is a relatively inexpensive Chinese converter that I got from Amazon.   I am going to evaluate the performance of the existing circuit and then replace the 220mF aluminum ...
The surface mount (SMD) capacitors used in this challenge are difficult to connect to instrumentation without soldering them into a test circuit.  To facilitate some of my scope and pulse generator measurements I made a simple test fixture that uses spring loaded "pogo" probes to contact the SMD contacts on the capacitors.  I can then connect the instruments to the test fixture and I can also add other components.  I had planned to print alignment frames for the various capacitor ...
ESR70 measurements The first thing that I wanted to do was to use the ESR70 to measure the various capacitors in the kit.  This proved a bit challenging since these are all SMD parts.  The smaller flat capacitors were difficult even with the tweezer probes.  The measurement repeatability was very good.  The one issue that I found with the the ESR70 is that I could not zero out the probe resistance.  Even after probe compensation, shorted probes would always read 0.02 W. ...
I was lucky to be selected as one of the sponsored challengers.  I received my kit last Tuesday but I was out of town, so I'm just getting started today.   What's in the kit Included in the kit was a Peak atlas ESR+ model ESR70 meter and a plastic case with 16 different polymer capacitor types.        ESR70 Features: ESR range 0-40Ω ESR resolution as low as 0.01Ω Capacitance range 1µF to 22000µF Can be used for low-ohms resistance ...