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

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Offline ScoobyDoo

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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 »
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Online Kleinstein

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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.
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Offline maxwell3e10

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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.
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