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Show Us Your Curve Tracer

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mjs:
Some years ago I bought a boatanchor HP 4142B with 3 SMU modules. Some Python in Jupyter Notebook created a nice programmable curve tracer. Unfortunately it's way too big to keep in my home lab at the moment..

Here's an example of results:
https://chart-studio.plotly.com/~msyrjala/13

Anthocyanina:

--- Quote from: Calambres on March 13, 2021, 07:53:50 am ---
Curve_Tracer_(ELEKTOR_12-89).pdf

--- End quote ---

Thank you! I have a question about the transformer used for the power supply. how do you get +14v and -14v from a 9v transformer? (they list a 9v transformer in the BOM) Thank you!

tubularnut:

--- Quote from: Anthocyanina on March 17, 2021, 05:38:58 am ---
Thank you! I have a question about the transformer used for the power supply. how do you get +14v and -14v from a 9v transformer? (they list a 9v transformer in the BOM) Thank you!

--- End quote ---

The notes refer to 14V as the 'unloaded' voltage, which will drop under load.

The secondary voltage rating will be the RMS voltage.

For a half rectified voltage with capacitor, the peak 'unloaded' voltage be 1.414 x secondary voltage, so for 9 volts, this will be just short of 13V. Given that a transformer will often give out a higher than rated voltage, its possible to see 14V.

When under load it will drop to around 0.9 x secondary voltage.

The +14V and -14V is because there are 2 half wave rectifiers, one for +ve and one for -ve.

Larryc001:
Another project for another day I’m afraid.

Anthocyanina:

--- Quote from: tubularnut on March 17, 2021, 06:29:24 am ---
--- Quote from: Anthocyanina on March 17, 2021, 05:38:58 am ---
Thank you! I have a question about the transformer used for the power supply. how do you get +14v and -14v from a 9v transformer? (they list a 9v transformer in the BOM) Thank you!

--- End quote ---

The notes refer to 14V as the 'unloaded' voltage, which will drop under load.

The secondary voltage rating will be the RMS voltage.

For a half rectified voltage with capacitor, the peak 'unloaded' voltage be 1.414 x secondary voltage, so for 9 volts, this will be just short of 13V. Given that a transformer will often give out a higher than rated voltage, its possible to see 14V.

When under load it will drop to around 0.9 x secondary voltage.

The +14V and -14V is because there are 2 half wave rectifiers, one for +ve and one for -ve.

--- End quote ---

Oooh, that makes sense. I have a 12-0-12 transformer that i would like to use for this. should i then use +9v and -9v regulators? Sorry if this shouldn't be the place to ask these questions, thought to ask since it's related to a curve tracer project! Thank you!

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