Dave's Tech Blog

Simply documentation of projects I start and sometimes even finish.

Friday, September 11, 2015

Filtering Silly Putty

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Years ago, probably about 1995 or thereabout, I hosted a 100lb Silly Putty group buy. I wrote a little web page using JSP, Perl, and Firebir...
Monday, February 16, 2015

Van Overhead Console

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I'm building a new overhead console for the '93 B250 conversion van I've recently acquired: After driving it around a while...
Sunday, December 28, 2014

What's in an Inexpensive Centrifuge?

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I've added a low-speed centrifuge to my lab equipment. It is a Chinese-made device sold on Amazon by Hardware Factory Store . It works w...
Monday, October 27, 2014

Crystal Chamber PID Tuning

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Since I'm trying to use a PID controller to keep the chamber temperatures under control I need to tune the PID parameters. And since thi...
Sunday, October 26, 2014

Crystal Chamber Controller Interface

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The code I've been using to run the temperature controller for the crystal chamber so far has been pretty bare, just the core PID loop. ...
Monday, October 20, 2014

Crystal Chamber Temperature Controller v0.1b

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I cobbled together a simple temp controller to try to get a feel for what it'll take to make one that will work for my temp controlled c...
Wednesday, October 15, 2014

Insulated Temperature Controlled Chamber

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For my crystal-growing I'd like to have better control over temperature so that I can cool solutions very slowly. I've been using a ...
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