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I was prompted to do this series of experiments by neuromodulator interesting blog posts. The puzzling thing abut his results is the apparent linking of rate of change of temperature with leakage current.   I set up my own test arrangement using and Espec SH262 Benchtop Temperature and Humidity chamber to control the temperature of the capacitors and a Keysight 34972A Data Acquisition system to do the leakage current measurements.   A TTi PL-155-P power supply was used to supply the ...
Results: Capacitance temperature dependence  The first thing that I wanted to test was how the temperature affects the capacitance of the different capacitors. I performed a temperature sweep from ambient temperature to ~80 °C, and then back to ambient temperature.   It can be seen that the temperature curve looks like a stairway at higher temperatures, this was caused by the lack of precision of the MyDAQ ohmmeter. The temperature curve was not identical in all 3 measurements ...
Introduction  Ideal capacitors can be defined with the following simple equation:   In this design challenge I will explore parasitic elements of polymer capacitors that are not modeled by the previous equation, in particular I will explore how temperature affects the capacitance and leakage current, and the dielectric absorption of 3 types of polymer capacitors.     Experimental methods  I received 17 different polymer capacitors, from them I selected 3 different t ...
COMPACT

more than you expect!

Posted by COMPACT Top Member Jun 11, 2019
Würth the effort! This challenge is an investigation about the viability of polymer capacitors and their use with vintage electronics. With the Panasonic SMT capacitor portion completed I was still looking for viable Polymer capacitors in through hole sizes and packaging.   Würth Elektronik so kindly obliged and provided me with a nice box set of samples that were all nicely bubble wrapped. Because of their form factors, these capacitors can be used as direct replacements for ...
LM3940-3.3 Linear Voltage Regulator With Polymer Capacitors  The LM3940-3.3 is a linear voltage regulator that whittles down 5V to 3.3V.  This part was introduced for the proliferation of 3.3V parts and logic in the early 1990's. At first glance of the data sheet the minimum output capacitance for this part is 33uF. Unusually large for a linear voltage regulator but National Semiconductor must of had its reasons. Using Capacitor #8 (33uF @ 10V) with an LM3940-3.3 did not work. With ...
Further Improvements  The photo shows the modifications I applied but this would not normally be done as a standard repair. It was purely an experiment applying first principles to improve system stability and reduce EMI.   The modifications include the removal on unnecessary capacitors, the addition of links, PCB breaks and localised Coulomb bucket capacitors. Here is the final result. As you can see the noise has gone and the picture is stable as a mountain.     Co ...
1.     Power Up 1.1     Initial Tests 1.2     Fault Finding and Rework 1.3     No Load Test 2.     Load Tests 3.     Physical Measurements 4.     Datasheets 5.     Other Posts 6.     Conclusions 7.    Thank You 8.   Next Steps 1.    ...
The element14 Experimenting with Polymer Capacitors Challenge is an opportunity to “experiment, test, breadboard, or just play around with Polymer Capacitors” and then show what was learned. In this 3rd and final post a Panasonic Polymer Capacitors from the element14 kit will be applied in a low ESR application where ceramic capacitors might otherwise be used.     Experiments to measure ESR and capacitance over a range of values which were completed and documented in Dee ...
Introduction  These are the test results from my experiments with changing out the electrolytic capacitors in the decoupling circuit of my current amplifier with alternative polymer capacitors.   The test set up is described in the original blog.   The majority of the measurements recorded are from a Picoscope 3404A, the exception being the amplifier output current that was recorded on a Fluke 8846A bench multimeter. As the Picoscope has only 4 channels available, the tests wer ...
Contents Contents 01. Rating and Parameters of Polymer Capacitor in the Kits. 02. Simulation of AD8428 Instrumentation Amplifier by ADI 03. Schemtic Design and PCB Design 04. PCB making and Solding 05. Test with MKR1000 06. Conclusion   01. Rating and Parameters of Polymer Capacitor in the Kits. First, all the capacitor shall be measured, capacitor measurement with Fluke 106 as comparation. There are some errors with RED text label, it is not clear what the r ...
This is my unofficial entry into the Experimenting with Polymer Capacitors challenge - I never applied for the capacitor kit, as my little escapades into electronics are very ad hoc and I felt that a kit of capacitors would go to waste on me, and it would be better off going to people who would make better use of it than I. The current amplifier circuit I am going to use for the tests was designed with radial through-hole capacitors, of which there were not any within the kit offered, makes a fu ...
Can we remove this noise using polymer capacitors or by other means?  As a random hack without applying any science I inserted some polymer capacitors at random into the PDN to observe any effects. I chose the capacitors with the most convenient packaging. The ones that allows direct soldering replacement without the need for any adapter boards. No perceptible difference was noticed on the video output or oscilloscope traces.   Applying some science into it shows that there would b ...
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 element14 Experimenting with Polymer Capacitors Challenge is an opportunity to “experiment, test, breadboard, or just play around with Polymer Capacitors” and then show what was learned.  In this second post the outcome of the experiments, results and findings for all of the Panasonic polymer capacitors in the element14 kit are presented.  Methods for improving the test procedure and potential further areas for study are discussed.     Background   Wh ...
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 ...