Tag: resistor box

7 decade thumbwheel resistor box (project #P1)

A while ago, I wrote articles about a bargain SMD resistor set (WHL #10 ) as well as some thumbwheel switches (WHL #11). Let’s start fresh in 2017 and present the final box :)

As already shown in the thumbwheel post, the initial resistor placement wasn’t perfect. I fiddled some more and I got a case and nice 4mm banana plugs for it. First, let’s see the final measurement results, done with a calibrated Keithley 2700 6 1/2 digit DMM in 4-Wire (Kelvin) mode.

Original performance:

Final performance:

Yep, the 1Ω data point still violates the 1%/10000ppm spec (1,9%). […]

22nd January 2017 22nd January 2017 By Bzzz In 1 Comment

Black 0-9 Digits Single Unit Pushwheel Thumbwheel Switch (WHL #11)

Folks, this is a big one. I will split into two articles to make the item review available now and show the finished project later (once I got a box around it). Maybe even three articles to post DMM comparison data. Today, I will show the unit and the first measuring results.

Back in January ( :neutral: ) I bought a 10-pack of these dials for 5.33€ including shipping at AliExpress. I saw these in the EEVblog forums and decided to have a go. And now you know the purpose of the assorted SMD resistors in WHL #10 ;)

First things first: Shipping took ages, and quality is very Wan Hung Lo’ish. […]

23rd October 2016 23rd October 2016 By Bzzz In No Comment