I've a custom made inductor 735uH+/-1% at 5Vrms/10kHz, TC=+300ppm/K
The mfr 'designed' it and after quite a bit of iterations, they finally came up with something satisfactory. Well until I made detailed measurements. Now I just feel it close...
See the pdf posted in abse.
What worries me is the inconsistency of the amplitude variation at low amplitude between some samples...
Any comments?
Could be that different tuning slug positions change the saturation curves.
It would be interesting to graph them with the slugs removed.
John
I barely remember my magnetic's courses, but isn't there "remanence" effects?
Does your inductor need to store energy? If not, why not use a gyrator? ...Jim Thompson
Noise. Active filters are horrible.
Cheers
Phil Hobbs
FB > I've a custom made inductor FB > 735uH+/-1% at 5Vrms/10kHz, TC=3D+300ppm/K FB >
FB > The mfr 'designed' it and after quite a bit FB > of iterations, they finally came up with FB > something satisfactory. Well until I FB > made detailed measurements. FB > Now I just feel it close... FB >
FB > See the pdf posted in abse. FB >
FB > What worries me is the inconsistency FB > of the amplitude variation at low FB > amplitude between some samples... FB >
FB > Any comments?
JL > Could be that different tuning slug JL > positions change the saturation curves. JL >
JL > It would be interesting to graph JL > them with the slugs removed.
JT > I barely remember my magnetic's courses, JT > but isn't there "remanence" effects?
JT > Does your inductor need to store energy? JT >=A0If not, why not use a gyrator?
I had a gyrator once.
Noise? What's that.... Slowman ?:-) ...Jim Thompson
=A0 =A0 ...Jim Thompson
=A0 =A0| =A0 =A0mens =A0 =A0 |
=A0 | =A0 =A0 et =A0 =A0 =A0|
=A0|
=A0 =A0 =A0 |
"> Does your inductor need to store energy? If not, why not use a
Isn't there energy stored in the capacitor of a gyrator? (mind you I've never used a gyrator except for fun.)
George H.
"George Herold" Jim Thompson
"> Does your inductor need to store energy? If not, why not use a
Isn't there energy stored in the capacitor of a gyrator?
** Sure - but it does not behave like the energy stored in the magnetic field around a real inductor." Since gyrators use active components, they only function as a gyrator within the power supply range of the active element. Hence gyrators are usually not very useful for situations requiring simulation of the 'flyback' property of inductors, where a large voltage spike is caused when current is interrupted. "
.... Phil
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Ahh, Thanks Phil. (I should have read the whole article.)
George H.
This behavior (AsubL variation with amplitude) had me curious about 3-1/2 years ago. I was building a transformer for a Flag antenna. For the transformer I used a large potcore (4229 3F3 material) I had used this same potcore in a 1000 watt amplifier and began to wonder if the AsubL would remain constant from the 100s of volts input down to several microvolt level. You have graphs going part way to where I'd like to see.
10 volts down to about 0.2 volts. I'd like to see 10 volts down to 0.000002 volts ( 2uv ) . Six more orders of amplitude. Although I don't know if this measurement is possible. It seems this would be important information for people building transformers for antennas or very low level transformers. I started a thread on s.e.d., but no one seemed to think there was anything to it and to forget about it. I didn't forget! Here's the thread;Have something to add? Share your thoughts — no account required.
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