Category Archives: Electronics

Posts about electronics. Usually meaning electrical gadgets smaller than a proper computer.

ThinkPad 560E

Complete ThinkPad 560E system.

I’ve been idly looking for one of the mid-90s ThinkPads known to have perfect OpenStep/Rhapsody support for years as a fun collector piece, but been unwilling to pay eBay prices. The other week I scored a pristine IBM ThinkPad 560E for $20 in a Shopgoodwill auction, below is notes on getting it up and running, plus some relevant history and plans.

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Apple 12″ Macintosh RGB Monitor Recap

This post is a retro post on a retro topic – a repair I did in 2017 on a monitor made in 1991. I got a question about (probably) the same problem in another venue and realized I never put it online. I managed to dig up my pictures and notes, so there is useful information to be shared.

My 12″ RGB Display is getting sad.

The end of my (2016) post about Recapping my Macintosh LC I discovered that my matching Apple 12″ Macintosh RGB Monitor ( M1296 ) was going pear-shaped, and speculated that I’d need to recap it.

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Macintosh SE Health Check

I had my dear old Macintosh SE out for a health check as I slowly extract my vintage computer collection from the (unconditioned) place I’ve been keeping it at my parents house to the basement of the place I’m renting. It had a couple interesting findings that seem worth putting online, including another floppy drive rebuild and a slightly elaborate fan replacement.

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Why did a Banggood package I ordered on March 26 just appear in Bahrain on July 5, the same day it finally showed “Shipment picked up?” Did it just get packed into a container and loaded on whatever outgoing vessel they could throw it on to get it out of their warehouse, and it was finally reprocessed there? Is it taking a tour of human-rights-violating trade partners for sport?

I’ve had China-export stuff with possible customs issues get routed through the Netherlands before, but the other package from the same order had lock picks and came faster and more direct.

ED: Since it arrived, full path for maximum hilarity:

Jul 07, 2020 10:33 Delivered
Jul 07, 2020 08:37 With delivery courier
Jul 07, 2020 07:34 Arrived at Delivery Facility in ERLANGER - USA
Jul 07, 2020 06:59 Departed Facility in CINCINNATI HUB - USA
Jul 07, 2020 00:48 Clearance processing complete at CINCINNATI HUB - USA
Jul 07, 2020 00:46 Processed at CINCINNATI HUB - USA
Jul 07, 2020 00:38 Arrived at Sort Facility CINCINNATI HUB - USA
Jul 06, 2020 21:02 Departed Facility in EAST MIDLANDS - UK
Jul 06, 2020 20:59 Transferred through EAST MIDLANDS - UK
Jul 06, 2020 18:59 Departed Facility in LEIPZIG - GERMANY
Jul 06, 2020 18:57 Transferred through LEIPZIG - GERMANY
Jul 06, 2020 18:08 Customs status updated
Jul 06, 2020 07:14 Departed Facility in BAHRAIN - BAHRAIN
Jul 06, 2020 05:05 Processed at BAHRAIN - BAHRAIN
Jul 05, 2020 17:18 Arrived at Sort Facility BAHRAIN - BAHRAIN
Jul 05, 2020 16:07 Departed Facility in BAHRAIN - BAHRAIN
Jul 05, 2020 14:05 Processed at BAHRAIN - BAHRAIN
Jul 05, 2020 13:37 Shipment picked up
Jun 20, 2020 09:15 Package has been sterilized and shipped out.
Jun 19, 2020 08:45 Our warehouse has started packing your items.
Mar 26, 2020 00:14 Order submit.
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Anycubic Linear Kossel: Unofficial Owner’s Guide

Anycubic Kossel on its stand

I’ve been working with a number of Anycubic Linear Kossel / Kossel Plus (whatever branding they’re using when you look) 3D printers for the last couple months, including one I bought personally. While I’m overall extremely pleased with them, there are a whole bunch of notes, fixes, and improvements I feel like should be collected somewhere.

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An Experiment in Water Cooled 3D Printing Extrusion

Scrapheap Challenge: The world’s worst syringe pump.

Or, three hours enjoyably lost to a visit from the bad idea fairy.

My PhD advisor and I were chatting in the lab today and had an idea that it would be interesting to try to drip/jet a bit of water onto just-extruded filament, ideally in small enough quantity that it phase changed and flashed off with all the excess energy, in order to allow printing unreasonable unsupported structures.

It unfortunately doesn’t look like it will be practical, but we got a PoC-grade implementation in a few hours and it seemed worth a quick write-up to document our experiment for the interwebz.

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Aneng AN8009 DMM with Hacks

Aneng AN8009 DMM

I just picked up an Aneng AN8009 DMM as an upgrade to the cheap, cheap (but surprisingly OK) Circuit Specialists branded MY-68 I’ve had as my home on-desk approxometer for ages. It’s a nice meter for $30ish, and can be readily hacked to improve its performance. I tend to point people to mid-range Uni-T DMMs when they asked for decent hobby meters, but now I might switch to one of these plus one of those little $10 Atmega328 based component testers cloned everywhere for ~$10 as basic electronics lab instruments.

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A Bit of 3D Printer Maintenance

We were doing a bit of beginning-of-summer lab maintenance and one of the projects was to figure out why the MakerGear M2 (Which has been heavily modified over the years, Azteeg x5 mini motherboard, E3D hotend, etc.) was behaving so strangely.
Well… there’s your problem.
Fresh 0.35mm nozzle next to the bored out, abraded down corpse of a nozzle that we’ve, in retrospect, been running for something like 3 years. Turns out printers work much better when the nozzle aperture is roughly the size it’s supposed to be.
Still seeing some odd temperature fluctuation, but … look at that thing.

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Ruideng Adjustable Bench Power Supply

I built myself a little adjustable bench power supply from Chinese modules, partly because I thought it would be handy to have one, and mostly because I wanted a small, straightforward project to do for my own sanity.

I set up a slightly different configuration than is typical, and am documenting it for funsies and/or to ease clones if anyone is so inclined. The whole project was about $60 all-in, for an (approximately) 0-34V, 0-5A adjustable bench power supply.
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MicroChorder

I hacked together an Arduino Micro firmware that is a drop-in replacement for a Spiffchorder, long version and code below the fold.
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