Group Actions
Engagement
  • Author Author: Robert Peter Oakes
  • Date Created: Date Created
  • Views 1937 views
  • Likes 3 likes
  • Comments 7 comments
Related
Recommended

The Modular Bench Power Supply ++ - Simple Display Setup

Robert Peter Oakes

This is the start of the next blog in my series for the LAB bench power supply, in this video I will explore an option of using dedicated Digital displays to show the current and Voltage and how having a display with differential inputs can help eliminate errors

 

Back to main PSU blog http://www.element14.com/community/groups/test-and-measurement/blog/2014/09/15/the-modular-bench-power-system-the-essential-diy-build-for-every-ee-student-and-old-timer-alike

 

 

I will be adding the schematics by the weekend, in the meantime, enjoy the video

  • in reply to Robert Peter Oakes

    Thanks for the reply, good to know image

    Please take whatever time you need.

     

    Oh, and when I'm at it I'll post the same comment as on YouTube:

     

    "Thanks for this project Peter, it's very informative and interesting.

    One thing I'd like to ask though, is that could you please add the URLs shown in your videos to the description of the videos as well? Or perhaps in the blog post over at Element14?

    That way it would be MUCH easier to look up the same datasheets or whatnot that you use in the videos image "

  • in reply to heffa

    I got a bit behind in the XMAS holiday challenges to am playing catchup, they will be there soon

  • Peter, I can't find the promised schematics used in this video - is it somewhere else or did you just forget to add it to the blog? image

  • in reply to DAB

    there not actually power meters, the ones I got from Newark/Farnell are simply 5V powered, 3.5 digit, +-200mV FSD. (I know an analogue term)

     

    but I used a select low value resistor to convert the current into a 0-200mV range representing 0-2A, the one used for voltage is simply connected to the low side of a 100:1 resistor network divider, simple as that.

     

    I will provide schematics for it.

     

    Also as a Heads up. Vishay Precision Group (VPG) , remember the webinar that recently showed from Powertron, well this is them, they have sent me a selection of sample 4 terminal (Kelvin connection ) resistors of low values (1ohm down to 0.01Ohm) and heavy power versions too, with something like 2ppm temp co-efficient which is awesome and a couple even 0.1% tolerance too.

     

    There also sending me some HIGH precision resistor divider network devices in something like a TO92  and TO220 packages, the divider networks are something like 0.01% accurate and perfect for instrumentation OPAMP feedback loops or for scaling to a display input, perfect for instrumentation

     

    I will be dedicating a whole episode on them, well the principle of kelvin connections,purpose built power sense resistors, the choice of cabling in a build and the benefits of precision components

  • Great video Peter,

     

    I was not aware that those little power meters were available.

     

    I will have to pick some of them up.

     

    DAB