LEAP#374 LT1019 Voltage Reference
I’ve been seeing the LT1019 precision reference show up in a number of designs recently, often as a reference for an ADC such as the LTC2400. It is worth a closer look. In this example, I’m using the LT1019 as an external analog reference for an Arduino.
As always, all notes, schematics and code are in the Little Electronics & Arduino Projects repo on GitHub
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cracking the static site SSL challenge with netlify
For the last year or so I’ve been running this blog on Github with Jekyll and Github Pages. That’s nice and easy, but the lack of SSL support for custom domains has remained stubbornly over-the-horizon.
I’m glad I tweeted my wish! With a nudge from @spencerbgibb I got to try out netlify.
… and it is the real deal! I’ve just ported half a dozen sites from Github Pages, now all with automatically-provisioned SSL from LetsEncrypt
- LEAP: Little Electronics and Arduino Projects
- Visual 555
- Toolbox
- Coding Kata
- The Fretboard
- ..and this blog of course
I’m really impressed with the static-site publishing system they’ve put together. It works just like Github Pages .. but better. Seriously, all I had to do was:
- Sign-in/sign-up
- Choose to add a site from one of my repos (automated with GitHub OAuth)
- Build requirements for most of these sites were auto-detected (I had a to tweak a couple where the site target was ambiguous)
- …and the site is deployed
- Next, add a custom domain name
- Switch the CNAME records
Then the only time consuming bit … waiting for DNS propagation!
Once DNS is all good, enabling SSL is just three clicks: verify DNS .. do it! .. confirm!
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LEAP#371 common emitter amplifier biasing
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
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LEAP#370 TS3A5018 Digital Switch
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
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