Author Archives: celem

Solar Garden-Light Failure Autopsy

About two years 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

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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

Chinese SOIC-8 test clips for in-Circuit Programming – Part 2

Last April I wrote about the cheap Chinese SOIC-8 test clips. In that post I primarily discussed the wiring – specifically that, as wired, it isn’t useful for in-circuit programming of the ATTiny85 SMD SOIC-8W chip. Ultimately, I rewired the … Continue reading

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COB Removal – Fail !

I have some  PCBs with a Chip-On-Board (COB) chip that I was curious about. A website stated that this COB contained a QX5252F chip but it was not stated how this was determined. I didn’t really believe it and decided that … Continue reading

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Caveat Emptor – SOIC8/SOP8 test clips

My mistake may benefit you if you are into budget surface mount PCB creation. I recently purchased an 8-pin  test clip for SOP8/SOIC8 surface mounted chips. My goal was to use my USBasp programmer to flash in-circuit ATTINY85-20SU chips. I … Continue reading

Posted in computer, Electronics, hardware, Test Equipment | 1 Comment