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The Bode-100 thread
The Bode-100 thread
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Old 8th August 2018, 12:24 PM   #51
jackinnj is offline jackinnj  United States
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The Bode-100 thread
Follow George's advice, keep cranking the voltage until you see smoke!
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Old 8th August 2018, 11:16 PM   #52
jackinnj is offline jackinnj  United States
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The Bode-100 thread
Looking at a TI application note, I got some THS3121 -- they are good to drive 400mA. The THS3121 does not have "Power-Down" or "Ref" so always consumes 7mA:
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Old 9th August 2018, 10:34 PM   #53
jackinnj is offline jackinnj  United States
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Since the THS3121 can drive a lot of current, and has a high slew rate, maybe it can be used as a line injector with a pair of MOSFETs: (This hasn't been built yet)
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Old 10th August 2018, 06:09 PM   #54
DualTriode is online now DualTriode  United States
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Hello,

It looks like this idea can kick butt. However I am a bit concerned about the the transfer curve of the 100uf capacitor.

Thanks DT
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Old 10th August 2018, 08:09 PM   #55
jackinnj is offline jackinnj  United States
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The Bode-100 thread
Can be normalized with the Bode-100 calibration regimen. Here's some actual results with the THS3121 (using a 1,000uF Nichicon). It's down 2.4dB@10MHz. I modified the evaluation module with a little help from the Dremel tool.
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File Type: png THS3121_Biased.png (72.7 KB, 41 views)

Last edited by jackinnj; 10th August 2018 at 08:16 PM.
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Old 10th August 2018, 10:50 PM   #56
DualTriode is online now DualTriode  United States
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Jack,

Very nice results.

DT
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Old Today, 11:20 PM   #57
DualTriode is online now DualTriode  United States
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Default Smoke On The Water

Hello,

Mostly staying indoors with the HEPA filter. California and Oregon are on fire. Look at this NOAA HRRR model of the smoke going past New Jersey.

Loop

Take a look at this VAC 250F core with most of 100 turns of primary and secondary coils made of solid strand silver plated 20 AWG wire with 600V insulation.
The idea here is a core that is less permeability than the B-Wit 100 core to allow much larger asymmetrical current, several 10ís of ma without saturation is the plan. Not yet tested.

Low frequency response appears to be okay. HF looks possibly usable to 3 or 4 megs.
See the attached frequency and phase plot plus photo.

Thanks DT
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File Type: png HR 4.png (45.7 KB, 0 views)
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