September 21 - THE WORKBENCH CHALLENGE 2015!
A Digital Salinometer
Believe it or not, Daniel Kramnik is only a Junior in High School and has built this Digital Salinometer for a Water Quality Science Olympiad event. The Digital Salinometer built by Daniel took almost 2 weeks and is capable of accuracy within 0.0014%. Daniel's entry ended up winning him first place at the regionals and he's now headed for the State competition in March. Amazing what high school kids can do these days!
"The entire circuit consisted of several parts: an opamp-based salinity-measuring circuit, a linear positive/negative power supply, a digital voltmeter, and a peltier device temperature controller.
In order to save time debugging (inevitably) flawed bread or perfboarded circuits, I designed custom circuit boards in Eagle CAD and etched them at home with ferric chloride. I won’t post my .sch/.brd files as that would make it too easy to copy this project for Science Olympiad, but I will share schematic image files and board image files (if you already know how to reCAD them for etching in Eagle, chances are, you’re already beyond this guide)."
November 19, 2015
- Modular Designs
- Wireless Trailer Taillights
- Using The “555” Timer IC In ‘Special’ Or Unusual Circuits
- Smiley’s Workshop 26: AVR Memory - Part 4 — Writing to AVR Flash!
- Pocket Geiger Unit
November 12, 2015
- What are the “Best” Components for Your Project?
- Build Your Own PIC Trainer from Surplus
- OP-AMP COOKBOOK — Part 4
- Smiley’s Workshop 25: AVR Memory - Part 3 — Program Memory In A Flash!
Need to brush up on your electronics principles? These multi-part series may be just what you need!
- Bipolar Transistor Cookbook
- Op-Amp Cookbook
- FET Principles And Circiuits
- Triac Principles And Circuits
- Understanding Digital Buffer, Gate And Logic IC Circuits
- Smiley's Workshop: AVR C Programming Workshop
- Smiley's Workshop: Serial Communications Between An Arduino And A PC
- Checking Inductors
- Small Logic Gates — The building blocks of versatile digital circuits.