Categories

App Note: Build your own laboratory precision voltage source

Posted on Saturday, October 13th, 2012 in app notes by DP

Annoyed with unstable voltage sources in your projects? EDN shows how to build a precision voltage reference and an output buffer for a high precision voltage source/sink. Grab the schematic off of EDN’s site.

This entry was posted on Saturday, October 13th, 2012 at 1:00 pm and is filed under app notes. You can follow any responses to this entry through the RSS 2.0 feed. You can skip to the end and leave a response. Pinging is currently not allowed.

8 Responses to “App Note: Build your own laboratory precision voltage source”

  1. Matseng says:

    Ok…, now I want one of those neat 5 decade Kelvin–Varley dividers… Or I just have to fork out $850 for a 7 decade Fluke 720 at eBay.

    Nah, for $800 I can get a crappy Chinese laser cutter instead – that would be more fun I think. :-)

  2. XTL says:

    .. until the tube burns out.

  3. hak8or says:

    Can anyone tell my why you can’t just use a high precision DAC for a precision voltage source?

    • Matseng says:

      You probably could. If you are using a >=17 bits DAC, a proper reference voltage, battery power and the buffered the output of the DAC. You probably have to get up to 20 bits to achieve the desired Linearity and monotonicity for the required 17 bits for a 5-decade unit.

      The Kelvin-Varley unit could also double as a resistor decade box as well as doing the voltage sink/sourcing if you add a switch for it though…

  4. I have the 5.0000V ref from http://www.voltagestandard.com/ and it is very easy to use

    • Matseng says:

      The Voltagestandard products seems to have reasonable prices. The DMMCheck Plus for $59 is almost a steal.

      But I get a bit of “Digit envy” when I see their 8.5 digit HP3458A, my main DMM is only a 6.5 digit Agilent 34401A currently two years out of its calibration date. :-)

  5. Jbeale says:

    Check out Geller Labs for an excellent value 10.0000 V reference.

  6. JBeale says:

    …specifically, they sell the “SVR” which is a 10 V, NIST-traceable 10 ppm accuracy reference for $40 which is the best deal I’ve seen. You do need an external +15V supply to power it. http://www.gellerlabs.com/Voltage%20References.htm

Leave a Reply

Notify me of followup comments via e-mail. You can also subscribe without commenting.

Recent Comments

  • Stennly: Despite the popularity of STM32s, it may not be the best place to start. As mentioned already, the Silicon Labs gecko family is cheap to...
  • Helge: Silicon Labs offer a powerful, unrestricted and completely free software development kit packaged with their Simplicity Studio IDE. It's built on Eclipse, and includes hundreds...
  • Sjaak: With development kit I ment software development kit. I couldn't (easily) find one back some time. Then I asked around and finally came up with...
  • Pranav gulati: I probably couldn't understand what you meant by ' ST doesn’t offer a development kit as I expected' There are numerous eval boards of STM32...
  • DP.: fixed, thanks