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Open Source Hardware

81 posts
shabaz

Building an LCR Meter

Posted by shabaz Top Member Jul 23, 2019
Introduction Recently there's been lots of interest in capacitor equivalent series resistance (ESR) and many other capacitor topics (e.g. see Deep Dive into ESR, Introduction  and Capacitor Leakage Experiments and Experimenting with Polymer Capacitors ). This blog post briefly discusses how to build a tool that can attach to a PC, in order to measure the impedance of components. For a brief overview of impedance, and why it can be important, see Measuring Capacitor Characteristics   ...
This post documents an enclosure for the milliohm meter described here and is a tale of how the mechanical bits are often as difficult to get right as the electronics.  The meter parts have been stored away, and thus it was not really available due to the lack of an enclosure.  Today I finally got around to putting it all together.   Here it is all wired up but outside of the enclosure: I am not that pleased with the wiring - too easy to bump loose and not that tidy - but easy ...
Introduction For open source projects, I usually create a table containing the parts details or bill of materials (BoM), but it is tiresome to then re-enter all that information into the Farnell or Newark website, to order the bits.   The March 2019 update to the element14 website contains the ability to paste BoM content and it will auto-convert into a nice table with hyperlinked buttons to go directly to the Farnell/Newark product page for each component, or a single-button to purchase a ...
Note: This is part 2 of a two-part project. For first part, see here: Building a Low Cost Solder Fume Extractor – Part 1   Introduction This project concerns a solder fume extractor that does as the title suggests, and sucks up solder fumes from soldering irons : ) It consists of a box containing multiple fans and filters, and a hose attachment with a funnel on the ingress side, and an egress side with the control/connectors. There is also an 'Aux' port, for additions such as LED la ...
This post documents the first working Version 1.3 of an inexpensive but reasonably accurate meter for measuring resistance in the milliohm range. The development to date is documented in the links at the bottom of this post.  Version 1.3 contains numerous upgrades and suggestions from Shabaz, Gene Breniman, John Wiltrout, and Jon Clift to which I am indebted.   It's Alive! Those who were following the project may have given up it has been so long since the last post.  The reas ...
Looks like there is a new Xilinx Spartan7 board on the market!       The S7-Mini board has been officially launched at Embedded World 2019, by Trentz Electronic, a German company specialized in the design of high-speed data acquisition, high-accuracy measurement and embedded digital signal processing systems based on FPGA and CPU architectures.   The design of the prototype board comes from last year collaboration between  Black Mesa Lab and OSH Park, which is now ...
Hopefully we'll hear more soon, but there appears to be another BeagleBone board launched at Embedded World, with the same form-factor as the BeagleBone Black. It's called the BeagleBone AI. I'm guessing it's not a replacement and won't be anywhere near as cost-reduced as the BBB and its variants (for example there is 16GB of eMMC on-board on the BB-AI), the board looks very useful for working with image recognition or other video processing. (Photo from the Beagleboard website, will replace w ...
This post documents Version 1.3 of an inexpensive but reasonably accurate meter for measuring resistance in the milliohm range. The development to date is documented in the links at the bottom of this post.  Version 1.3 contains numerous upgrades and suggestions from Shabaz, Gene Breniman, John Wiltrout, and Jon Clift to which I am indebted.  I intend to send off for new PCBs tomorrow evening and any comments in the meantime are greatly appreciated!  NOTE: This post was revised on ...
Introduction This short blog post documents the specific component values and any mods done to the revision 1 PCB from fmilburn Working Prototype of a Kelvin (4-Wire) Milliohm Meter  Project14  Test Instrumentation entry! It is a project intended to create a 4-wire measurement meter for 0-4 ohm and 0-40 ohm ranges, with sub-milliohm granularity.   It is a physically small test instrument, but works well! In very limited tests, the typical discrepancy between a calibrated commerc ...
Part 1, Making Fancy Cables: Network Cables!  examined how coloured and patterned nylon braids could be used for cable assembles: ) Those cables are intended for demos/presentations and so on. Nylon braid is very easy to use because it can expand a lot, and is slippery against the wire so it slides on well too. However, although it looks visually nice, it is not soft. For home use, maybe a softer braiding is preferred.   For a long time I have wondered how to create composite cable ...
Introduction There are some really nice small enclosures that are incorporated into products sold by Mini-Circuits and others. They are very cool because their surfaces are perfectly perpendicular to each other, with no draft angle. This makes them perfect for joining modules together a bit like plumbing, and quick and easy connector alignment.   I didn’t know of any low-cost source of them (I could find low-cost angled sides, and really expensive ones with perpendicular sides but no ...
Introduction I've often heard the issue that the audio isn't loud enough when people plug in their iPods/phones and so on into music systems, even if they turn the volume up to maximum on their device or the amplifier.   Often the problem is down to the fact that the 3.5mm plug is being used for two different roles. On the iPod/phone the plug is being used to carry a headphone output signal. But on the music system, the socket is used to accept a line level signal.   Headphones have ...
(This is part 1. For part 2, see here! Making Fancy Cables Part 2: Soft Headphone and Composite Cables  )   Introduction This very short blog post describes the steps I took to make network patch cables that I think are slightly nicer-looking than normal. Such a thing is subjective of course. Why would anyone want to do this? Well, sometimes I need to do presentations or demonstrations, and the ugly messy wires at the back can become a lot more attractive this way! Also, I happened to ...
Hi, I want to introduce a project of me. It's a enclosure set with in-build touchscreen for top wall mounting for ESP32 and ESP8266 modules. This kit enables you to mount your project permanent in your living room, corridor or other exposed places.   https://www.hwhardsoft.de/english/projects/arduitouch-esp/     ...
Introduction Background to the Project Hardware Overview What Functionality is Implemented? Using It What Performance does it have? How to make it? Morpheus Main Board FRDM Board Software Setting up and using mbed-cli TFT Screen Summary Appendix: PCB Renders Issues Tracking Revision 1 PCB Attachments     Introduction Sometimes it is interesting to make test equipment, even if it can’t replace commercial products. ...

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