Author Topic: 10V 40mA DC Calibrator in Elektor Magazine  (Read 1544 times)

0 Members and 1 Guest are viewing this topic.

Offline ScoobyDoo

  • Regular Contributor
  • *
  • Posts: 76
  • Country: fr
10V 40mA DC Calibrator in Elektor Magazine
« on: December 05, 2021, 06:18:06 pm »
« Last Edit: December 05, 2021, 06:19:40 pm by ScoobyDoo »
 
The following users thanked this post: quarks, Mickle T., Vgkid, HighVoltage, doktor pyta, Kosmic, antintedo, KT88

Online Kleinstein

  • Super Contributor
  • ***
  • Posts: 11026
  • Country: de
Re: 10V 40mA DC Calibrator in Elektor Magazine
« Reply #1 on: December 05, 2021, 08:16:43 pm »
I think there could be a potendial problem with the protection: The clamping at the output may be sufficient if the circuit is power powered, but with no power or a lower voltage (e.g. during turn off / turn on), the ouput votlage can exceed the supply of the chips.  One may still get away with this - depends on the chips.

Given the price for the 2 ppm/K resistors it is a rather strange way to generate the +-10.5 V. The simpler choice would have been 3 x 7 V ref in series and than just get the center right.  I guess 3 x LM399 would have been easier.
 

Offline maxwell3e10

  • Frequent Contributor
  • **
  • Posts: 689
  • Country: us
Re: 10V 40mA DC Calibrator in Elektor Magazine
« Reply #2 on: December 06, 2021, 05:31:59 am »
One can use LT5400 resistor matching network, its not expensive. That's what is done in SRS DC205, which has a very similar design.
 
The following users thanked this post: doktor pyta, syau


Share me

Digg  Facebook  SlashDot  Delicious  Technorati  Twitter  Google  Yahoo
Smf