Author Archives: celem

Nifty SD Card Gadget

I recently purchased, on eBay, a nifty little SD Card gadget. You can plug either a regular or micro-size SD card into it and then plug into either a standard or micro USB port. It is pretty handy, especially for … Continue reading

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Tamarack Fan – What’s Inside

Another non-electronic post. It is an interesting design using cams, levers and microswitches. It’s sort 1960s, in a Rube Goldberg’ish way but it works and that is what counts. Well, the mechanism works well but the fan is noisy and … Continue reading

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Whole House Fan (Non Electronic Post)

I haven’t posted lately because an electronic project that I worked on for much of 2017 and into 2018 occupied most of my spare time. Unfortunately, it hit a roadblock (cost of FCC compliance testing, not technical) and my attention … Continue reading

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Solar Garden-Light Failure Autopsy

About a year ago I placed a Dollar-Tree Solar Garden-Light, (Fig 3, below) in a sunny place of our yard. From a previously identical light I knew that the battery contacts were thinly plated steel which would corrode and cause … Continue reading

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Macrofab Pick and Place (PnP) – musings

NOTE: This post has some significant update of January 28, 2018 I have been doing some PCB SMT design using pcb-rnd with a goal of trying a board assembly shop.  I’ll do a few prototypes but that is all. Macrofab has … Continue reading

Posted in Electronics, PCB Etching | Tagged , , , , , | 3 Comments

awka – awk to C converter

I love AWK. I am among a minority. While many people use awk one-liners in shell scripts, few utilize awk as it was originally intended – a stand-alone language. I used to use it extensively back in the 1990s and … Continue reading

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Useful Small PCB Work holder

I was watching a YouTube video series about removing and replacing a BGA IC and the talented technician was using a really useful looking PCB holder. You’ll see the PCB holder at 3:50 into the YouTube video link below. The … Continue reading

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Linux Associate file icon and application

I could not get association of a file icon, mime type and application to work satisfactorily. There are numerous how-tos on the Internet but all are incomplete or wrong. The greatest help, for me, was the ARCH Linux Default applications help … Continue reading

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SMD Temperature / Humidity Sensor

I made a Printed Circuit Board (PCB) for a project that I have been working on that a temperature and humidity sensor. My initial PCB had mostly Surface Mount Devices (SMD) parts but three parts were discrete through-hole parts. Through-hole … Continue reading

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All SMD Radio Transmitter

In a current personal(1), i.e., not for sale or distribution, project I have been using a Chinese ASK radio transmitter module – the STX-882, which I posted about back in February of this year. The STX-882 works well BUT being … Continue reading

Posted in Arduino, Electronics, hardware, PCB Etching | Tagged , , , , , | 1 Comment