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Category Archives: Electronics.
The Tale of “Nitecore” Keychain LED lamps …
www.youtube.com/watch?v=rZjXpqfiAhc”>sponge-bob
Once upon a time there was an overly enthusiastic browser of ebay items, instigated by “BigClive” to buy stuff. He purchased two Nitecore knock-off lights, a bit too cheap to be true! The packaging looks surprisingly good. Guess which one … Continue reading
Posted in Electronics.
Tagged cheap, ebay, failure by design, keychain, lamp, LED, nitecore
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The worst Android tablet — Failed attempts of …
As You can see, there’s nothing of interest here. This post was cancelled due to lack of material & motivation. Please proceed to the next post in this mini-series. If you’re a user of headphones, you may want to turn … Continue reading
IWATSU LeCroy 9350A — bringing back old memories…
This “beauty” appeared on my desk today. Just testing & playing with it. I used the arb sig-gen of a PicoScope 2204A for generating a unpleasant test-signal. Trying to trigger on it was “interesting” :-)
Posted in Electronics.
Tagged 9350A, amber, CRO, DSO, heavy, IWATSU, lecroy, oscilloscope
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ERSA I-Con Nano — A pico review
Well… the device I got at work was a sad case of “dead on arrival”. Temperature regulation was totally crazy, touching the case moved the measured value from about 350°C to 60°C, with a subsequent massive overshoot. So we have … Continue reading
Triple Teardown Tardiness — Long Forgotten Boxes Of Stuff
Moving == carrying heavy boxes, lots of them. Suboptimal. Getting rid of stuff is imperative! If You’re so inclined, You’ll find sloppy teardowns of 3 devices below. Mostly images and a bit of video footage at the end.
Posted in Electronics.
Tagged HDD, Hitachi, microdrive, mp3, Samsung, teardown
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The worst Android tablet — A quick teardown
Expectations. When buying a cheap device, I don’t expect a display with “Retina” quality, but it should still be usable and not something the engineers who designed it have to be ashamed about. It shouldn’t be a piece of shit … Continue reading
YOUYUE 858D+ hotair station — Release V1.45
A small but helpful upgrade, if you’re into acquiring your own temperature calibration data. At some undetermined time in the future this might be expanded to a full multi-point calibration mode. The config menu was amended with the parameter ‘display_adc_raw’. … Continue reading
Posted in Electronics.
Tagged 858D+, ADC, calibration, data, hotair, raw, soldering station, upgrade, youyue
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YOUYUE 858D+ hotair station — Bugfix release V1.44
I’m glad to announce that the annoying watchdog issue has finally been fixed. It was a dumb error on my side, combined with a prevalence in some ATmega chips to have certain binary values in uninitialized registers after a cold … Continue reading
Posted in Electronics.
Tagged AVR, avr-libc, Bozo, Bugfix, init1, init3, memory sections, mistake, RTFM, watchdog, youyue, zeroReg
2 Comments
YOUYUE 858D+ hotair station — BLDC Fan-speed mod
I’ve finally forced myself to layout a small board. It’s been far too long anyway. It consists of these building blocks: reference voltage, comparator, RC low-pass, gain. There are better methods for the job, e.g. using a digital one-shot to … Continue reading
Error U81 — Panasonic DMR-EX75 repair
Some explanation:
Fawlty USB3.0 controller card — DC-DC noise?
Well, this won’t make it any easier! Not at all…
Fawlty USB3.0 controller card — quick DC-DC regulator check
This card is pretty good, when it works. Transfer-speeds were fine, close to 100MB/s with an external USB3 disk. It works nicely with Linux – plug and play. Then the problems started…
Posted in Electronics.
Tagged ACT4060A, buck, controller, DC-DC, efficiency, PCI-E, regulator, Renesas, TD6810, testing, USB3, µPD720202
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It looks nice on graphs, but there’s so much to not understand
Posted in Electronics.
Tagged Nyquist, sampling
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Spontaneous LED bulb teardown — OSRAM AA66588 [10W]
Yes, yet another power-supply failure!
IKEA Samtid mood-light BT firmware — simple_serial
This firmware for the ISML + HC-05 Bluetooth module currently implements the same simple interface as the current WiFi-code named ‘browser_control’.
|
1 |
SET:mode=0&start=0&stop=63&hue=100&sat=100&val=100& |
Pairing the ‘HC-05’on linux using the command line (openSUSE 13.2): When first powered on, the HC-05 module will … Continue reading
Importing LEDs from China — Battle with customs follow-up
Behold, the stickers of DOOM… If you should find any of these on a shipment to you, prepare for battle!
Posted in Electronics.
Tagged aliexpress, CE, customs, follow-up, import, LED, RGB, RoHS, WS2812B
4 Comments
HZA — Won the battle, but not the war
I ordered a couple of WS2812B on Aliexpress more than THREE months ago. Boy what trouble that has conjured up! The seller on Aliexpress now probably thinks I’m a crook, because I missed an email that asked me to provide … Continue reading
Posted in Electronics.
Tagged aliexpress, CE, China, customs, HZA, import, RoHS, WS2812B, Zoll
2 Comments
Status lamp on the loose — Partial oven teardown
ARGH! I can’t be having with that! I do hope this lamp is a low voltage one…
Soldering for masochists — LED indicator 0402 edition
Purple circuit boards are available on oshpark. $2.30 for a three-pack (free shipping).
Posted in Electronics.
Tagged 0402, 8-bit, indicator, LED, masochistic
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ISML + WiFi — ESP8266 finally tamed, but…
Preliminary testing of WiFi control using the ESP8266 module.
Posted in Electronics.
Tagged AVR, erratic behaviour, ESP8266, IKEA, ISML, LED, mood light, RAM, RGB, Smatid, usage, WiFi, WS2812B
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