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tardate 2018



This blog is my occasional diary of Quite Interesting Things. It is generally technical, meaning all things web, open source, polyglot-programming, electronics and concerning data. But sometimes ravings on books or musics, and occasionally a rant or philo



 



LEAP#371 common emitter amplifier biasing

Thu, 11 Jan 2018 16:09:24 +0000

I am inspired once again by one of w2aew’s excellent vidoes, this time to revisit the operating classes and biasing design rules of the common-emitter amplifier.

As always, all notes, schematics and code are in the Little Electronics & Arduino Projects repo on GitHub (image)




LEAP#370 TS3A5018 Digital Switch

Mon, 08 Jan 2018 18:18:14 +0000

Just a quick test of the TS3A5018 digital switch which I am looking at for an application in switching amplifier gain stages.

The TS3A5018 is a 1.8 to 3.6V device with four SPDT switches controlled from a single input, and a master active-low enable pin. It is guaranteed break-before-make (max 58ns).

As always, all notes, schematics and code are in the Little Electronics & Arduino Projects repo on GitHub

(image)




LEAP#369 my beeping Boldport ananas

Sun, 07 Jan 2018 12:01:27 +0000

Boldport Club Project #20 is the first designed by Ben, the new Boldporter. And it’s a beauty!

As is often the case, a small but interesting circuit is at the core of a beautiful design. The circuit is essentially four repetitions of an RC phase-shift oscillator. Like other projects such as the famous Cordwood series, the design employs multi-board symmetry and 3D construction.

As always, all notes, schematics and code are in the Little Electronics & Arduino Projects repo on GitHub

(image)

Here’s a quick demo (with special customisation!):

class="youtube-embed" src="https://www.youtube.com/embed/r5lmMHbLu4c" frameborder="0" allowfullscreen="">



LEAP#368 Granular Synth

Sat, 06 Jan 2018 10:07:32 +0000

The “Granular Synth” idea harks back to an old Auduino project. I stumbled upon it again recently and decided it deserved a quick build in an Altoids tin ..

.. because granular synthesis is a basically how they make Altoids, right?

As always, all notes, schematics and code are in the Little Electronics & Arduino Projects repo on GitHub

(image)

If you can put up with 5 minutes of me fiddling around, here’s a taste of how it performs..

class="youtube-embed" src="https://www.youtube.com/embed/1UOCTyM_3Ns" frameborder="0" allowfullscreen="">



LEAP#367 nRF24 Scanner

Wed, 03 Jan 2018 18:27:14 +0000

While trying to improve the range of nRF24L01+ some modules, and got distracted into building a channel scanner. The basic code is from the RF24 library examples, but this gets pimped up with a Nokia 5110 LCD display, multiple modes and a handy enclosure.

As always, all notes, schematics and code are in the Little Electronics & Arduino Projects repo on GitHub

(image)




LEAP#365 Driving a Nokia 5110 LCD with the Adafruit library

Sun, 31 Dec 2017 08:00:51 +0000

I’ve been having SPI conflicts with other libraries I’ve used for controlling the Nokia 5110 LCD, so time to pull out the big guns - the wonderful Adafruit library set which includes a PCD8544 module.

I started with a few tests of the hardware and software SPI modes.

As always, all notes, schematics and code are in the Little Electronics & Arduino Projects repo on GitHub (image)




LEAP#364 Classic Nokia Ringtone

Sat, 30 Dec 2017 15:01:13 +0000

For obscure reasons, I wanted a version of the classic Nokia ringtone on an Arduino. So… I transcribed the score in Guitar Pro and tested it in a little sketch.

As always, all notes, schematics and code are in the Little Electronics & Arduino Projects repo on GitHub (image)

Here’s a quick demo:

class="youtube-embed" src="https://www.youtube.com/embed/U6u6AV16lg8" frameborder="0" allowfullscreen="">



LEAP#363 BINCO fidget counter

Mon, 25 Dec 2017 06:44:58 +0000

The BINCO a binary counter that can be configured to count up or down. It uses Snaptron domes as buttons (on, slow/fast a,d rest). The heart of the counter is a 555 timer driving a 74HC4020D 14-bit Binary Counter from which 11 taps drive some nice reverse-mount LEDs.

As always, all notes, schematics and code are in the Little Electronics & Arduino Projects repo on GitHub (image)




LEAP#362 H-83A 12 song music chip

Sun, 24 Dec 2017 17:33:51 +0000

The H-83A is yet another music chip, this time programmed with 12 tunes. I haven’t figured out all the songs, but they sound like classic Chinese folk tunes.

This chip requires very minimal external components (resistor, switch and power), but volume is decent in all it’s 8-bit wonder!

As always, all notes, schematics and code are in the Little Electronics & Arduino Projects repo on GitHub (image)




LEAP#361 128x128 TFT LCDs

Sun, 24 Dec 2017 15:50:49 +0000

I dug out a 1.44 inch 128*128 SPI Color TFT LCD Module from my parts drawer as a possible display for a project I’m working on. First .. put it to the test and try a couple of Arduino libraries. As always, all notes, schematics and code are in the Little Electronics & Arduino Projects repo on GitHub (image)