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2021-03-04

Boost/Buck Converters for a Split Rail Supply

tl;dr No. I like op amps and they are best served with a 0v-referenced split rail supply, say +/-15v. I’ve got a bag of cheap, adjustable, switching boost converter modules [1] and a bag of cheap, adjustable, switching buck converter modules [2]. I have an old laptop power supply with 12v out. Can I get +/-15v? First (mildly irritating) snag,...

Categories Electronics Comments: 0
2021-03-01

Simple Drawing Robot, Python Sums Weirdness

The WHO have an Adult ADHD Self-Test. It’s very short, 18 questions and “Six of the eighteen questions were found to be the most predictive of symptoms consistent withADHD.”. Number 6 is : How often do you feel overly active and compelled to do things, like you were driven by a motor? I’ve used Arduinos & similar microcontrollers before, until...

Categories Coding/Electronics Comments: 0
2021-02-19

Bitcoin, Ponzi & Capitalism

Just some passing thoughts I felt like spitting out. Coincidentally I watched another episode of Adam Curtis‘ excellent Can’t Get You Out of My Head documentary series last night. I’ve seen talk of Bitcoin as being a kind of con, because it’s all virtual. But virtually all money is virtual since Nixon dropped the tie to the gold reserve. A...

Categories Uncategorized Comments: 0
2021-02-07

Headless Chatterbox

I wanted to jot down some notes about where I’m at with this thing, on writing the title realised a peculiar coincidence. Bit of tech stuff below, but first… For a kind-of fork of my own project, Chatterbox (a speech-like synth) I am making another version of the hardware without all the manual controls. It’s common to call software without...

Categories Uncategorized Comments: 0
2021-02-04

State of Play

These are the projects I’m working on. All are open source, most code etc. is at https://github.com/danja. My Home Page is at http://hyperdata.it. This doc is a work in progress. HKMS – Hyperdata Knowledge Management System Chatterbox About Hyperdata Knowledge Management System Status : subsystems in different stages HKMS is the umbrella name I’m using for a variety of applications...

Categories Uncategorized Comments: 0
2021-01-25

Chatterbox, next

My main reason for Chatterbox was to have something with a well-defined target that I could focus on for a few weeks and get my head away from all the open-ended projects I was being overwhelmed by. About a year on I realise it wasn’t the best choice. Making noises with microcontrollers turns out to also be open-ended. But I...

Categories Uncategorized Comments: 0
2021-01-14

Synchronearlicity

I’ve recently had three funny near-coincidences. Not the oh wow! kind for anyone but me. Fun though. First, the other day, I was feeling bad for Marinella. She’s a medic, has been deep in the Covid thing, testing folks up in the hills. Had ordered a ultrasound scanner for her own use, but was getting a bit frustrated by it’s...

Categories Uncategorized Comments: 0
2021-01-09

Drummers and Bass

Two nights ago, due to heavy snow, the power here went off. Naturally, I was unprepared. The first day of this I got through by reading. Some of the mass of papers I have printed out, but I got fed up of that fast. Fortunately Danbri had sent me a book for Xmas: Fast Forward: Confessions of a Post-Punk Percussionist:...

Categories Uncategorized Comments: 0
2021-01-04

3D Printing Chaos

A Friend on Facebook, Kicki, just made my mind buzz. Her post started “Is it possible to 3D print a Menger sponge, M >= 3, and if so, would anyone with a 3D printer make me one?“. (My italics, hee hee, right approach). I don’t have a 3D printer, but my response would be, well yeah, probably quite easily. But...

Categories Uncategorized Comments: 0
2021-01-04

Breadboard Mystery

Breadboards are a wonderful aid to electronic prototyping. They are small plastic blocks with lots of electrical sockets that will accommodate components or wires. Typically you have 2 horizontal rows of sockets in the middle which are lined up to take standard chips with 0.1″ leg spacing and vertical rows at either side, typically used for power rails. The name...

Categories Uncategorized Comments: 0

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