Category Archives: c-electronics

General Electronics Posts

Woof Off! – A Device to Control an Out-of-Control Barking Dog

Posted on March 13, 2018 by

A friend came to me a few months ago asking for help building something to stop his neighbor’s barking dog. I’ve been having the same problem for a few years now, so I was definitely interested. I’m fortunate enough to … Continue reading →

Posted in c-electronics | Tagged , | 1 Comment

Poor Man’s Conductive Pre-Compliance Testing

Posted on December 19, 2017 by

I want to do some pre-compliance testing on Scammer Jammer. I have an inexpensive spectrum analyzer to do radiated testing. Conductive testing requires more expensive equipment. First, you need an LISN device and, in my case, it needs to be … Continue reading →

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Scammer Jammer Telemarketer Call Blocker

Posted on December 18, 2017 by

I’ve not posted much in the past 2 years because I’ve been busy on the project that was, in part, due to the research that I ended up posting here. I didn’t want to post anything specifically about this project … Continue reading →

Posted in c-electronics, c-lazarus, c-Misc, c-teensy | Tagged | 2 Comments

Cermetek CH1724 Modem PTH Adapter Board

Posted on March 2, 2017 by

I need to solder pins to multiple CH1724 modems which look like this: I tried soldering header pins directly, but that was a cluster. So I designed this little adapter board: You can layout header pins on a PCB, put … Continue reading →

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Cleaning Flux from Printed Circuit Boards (PCB)

Posted on November 22, 2016 by

I got some professional looking PCB boards manufactured for a project recently. The boards look great compared to anything I could do myself. Problem is, after I solder on the components and try to clean the flux off, I’m always … Continue reading →

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Project Box Graphics

Posted on April 25, 2016 by

After building my project’s box (see here), I wanted to create some decent graphics. I spent a fair amount of money on the guts, I did a nice job cutting holes, I expect the ‘customer’ will have this for several … Continue reading →

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Cutting Holes in an ABS Plastic Project Box

Posted on April 22, 2016 by

Wrapping up a project and it is time for the case. I purchased a nice heavy duty case from Mouser to use. It needs several holes which are easy enough but it also needs a large rectangle cut out as … Continue reading →

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How to use VeeCAD Stripboard Editor with CadSoft Eagle

Posted on April 16, 2016 by

A project I’m working on is a one-off. Since I’m only building one, having a real PCB created is over kill. In the past I would etch my own, but I’m getting to where the chemicals bug me so I … Continue reading →

Posted in c-electronics | Tagged | 2 Comments

SIM800L GSM/GPRS Part II – Seeking Stability

Posted on April 12, 2016 by

My first SIM800L dev board was a flop when I tried to use it in an actual project. As mentioned at the end of my last post, the reliability of that SIM800L dev board was horrible. The SIM800L chip would … Continue reading →

Posted in c-electronics | Tagged | 13 Comments

SIM800L GSM/GPRS Cellular Eval Board First Look

Posted on March 26, 2016 by

I’ve built a project using a SIM900 GSM/GPRS dev card. It works fine, but that dev card is too big to fit in the project case and kind of expensive (comparatively speaking). I went looking for another solution and found … Continue reading →

Posted in c-electronics | Tagged | 7 Comments