Category Archives: Electronics.

Well… electronics :-)

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

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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” :-)

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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

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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.

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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

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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

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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

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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

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Error U81 — Panasonic DMR-EX75 repair

Some explanation:

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Fawlty USB3.0 controller card — DC-DC noise?

Well, this won’t make it any easier! Not at all…

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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…

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It looks nice on graphs, but there’s so much to not understand

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Spontaneous LED bulb teardown — OSRAM AA66588 [10W]

Yes, yet another power-supply failure!

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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’.

Pairing the ‘HC-05’on linux using the command line (openSUSE 13.2): When first powered on, the HC-05 module will … Continue reading

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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!

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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

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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…

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Soldering for masochists — LED indicator 0402 edition

Purple circuit boards are available on oshpark. $2.30 for a three-pack (free shipping).

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ISML + WiFi — ESP8266 finally tamed, but…

Preliminary testing of WiFi control using the ESP8266 module.

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ISML killed 1st power supply — short autopsy

Last night I experienced a slight audible annoyance, coming from the #ISML power supply (5V-3A). Shortly thereafter the light literally went out, permanently. I noticed a very faint smell of burnt electronics, but delayed the autopsy until today.

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