Rotary Knobs with decade scale - Page 1
Forum section: electronics / projects

author: ralph081969
author_rank: Newbie
timestamp: April 14, 2019, 02:27:31 pm
content: Hi folks,for my resistor decade box, I would need some rotary knobs just as Dave showed in video #210 (Krohn-Hite DC Voltage Standard Teardown & Calibration) - with transparent scale and "highlighted" number.(see also in the screenshot attached)Can't find anything on the web, maybe it's because I'm dumb...Can anyone give me a hint as link?Any help would be appreciated...kr,ralph

author: adi_sby2
author_rank: Newbie
timestamp: April 14, 2019, 02:38:48 pm
content: maybe "potensiometer multiturn resistor" you need..Sent from my ASUS_Z01BDB using Tapatalk

author: ralph081969
author_rank: Newbie
timestamp: April 14, 2019, 02:40:33 pm
content: thanks, but I just need the knobs...

author: Twoflower
author_rank: Frequent Contributor
timestamp: April 14, 2019, 03:06:51 pm
content: These parts are additional pieces for some knobs. For example:https://cdn-reichelt.de/documents/datenblatt/B400/ZEIGER14_ZEIGER20-1_ZEIGER28-1_SCHEIBE%23MEN.pdfSome of them can be purchased at Reichelt and Conrad.

author: ebastler
author_rank: Super Contributor
timestamp: April 14, 2019, 04:33:35 pm
content: Your picture shows a scale going from 0 to 10. Is that really what you need? I understand that you want to use the scale on rotary switches, not a potentiometers, and am not aware of switches with 11 positions?SCNR

author: ralph081969
author_rank: Newbie
timestamp: April 14, 2019, 06:28:39 pm
content: (see english translation below)Danke Euch!Weisst eh - 11 Ohm oder 110 Ohm oder 1k1 auf einer Dekadenbox is halt nur fast gut10 Ohm is eh auch ned so toll.... aber, what shells.Thx,very nice hints! 11 ohms would be undecade box ?kr,ralph

author: joseph nicholas
author_rank: Frequent Contributor
timestamp: April 14, 2019, 06:54:06 pm
content: It just doesn't get funnier than Nigel in Spinal Tap.

author: radix
author_rank: Contributor
timestamp: April 15, 2019, 01:07:43 am
content: Quote from: ebastler on April 14, 2019, 04:33:35 pmMine actually have 12 positions. That means that they go up to 11. Similar to what is on this picture:

author: duak
author_rank: Super Contributor
timestamp: April 15, 2019, 09:12:08 pm
content: It's just that much better than 10. Just that extra push. (or words to that effect)I could see an advantage in decadal range overlap. Whenever you cross a decade boundary, an 11 or 12 position position switch would not require having to stop and fiddle with a number of other knobs. ie., take care of the carries or borrows.The guitar reference reminded me of the knobs in the attached image. I don't think they are useable here, but they probably work well for the viewing angle on a guitar. I think they are a top hat style with index or dial and then cast into an overall cylindrical shape.

author: CatalinaWOW
author_rank: Super Contributor
timestamp: April 15, 2019, 09:48:26 pm
content: You could print the appropriate numbers on a transparency and after trimming to shape glue to the back of any number of standard knobs. Gives you complete artistic control over fonts and number size at the cost of some minor fabrication. You could even use the standard resistor color codes as background colors for each segment if you weren't holding out for the 12 position switch. My decade boxes only have eleven positions 0-9 and X for 10. Always fun to mix arabic notation with roman numerals.