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Old 6th October 2003, 07:50 PM   #61
Electrons are yellow and more is better!
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Jan, what do you say about the "best" method in distributing power, tied together or some isolation?
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Old 6th October 2003, 08:03 PM   #62
Electrons are yellow and more is better!
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Quote:
Originally posted by janneman
Of course you are astonished. You thought you were measuring the regulator, but in effect you have been checking the dynamic impedance of a cap with parallel inductance with DC offset. 20 years you said?
We are nice.....

This is a perfectly good method if you are interested in the lower frequencies. Inductance of a short wire is nothing (OK, not much) at 100 Hz, 1 kHz or so but you should allways be carefull in analyzing results. What are you measuring really. Never hurts to think about it.

If you are testing a high speed regulator, the test setup is a little bit more advanced, right Fred?
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Old 6th October 2003, 09:32 PM   #63
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Default Re: I wish I was that smart...........

Quote:
Originally posted by Fred Dieckmann
Does anyone know what "delusions of grandeur" is in Svensk ? Is "storhetsvansinne" close?
Not only close, it is correct. Where on earth did you dig that
up? Don't tell me you are studying swedish in secret.
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Old 6th October 2003, 09:52 PM   #64
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Default Comedy this good you can't get just any old place.....

Unless you look in the "newer op-amps" thread.

Between watching Phred and Per pulling each other's leg, John Curl stating what a lot of us have known for years (which seems to baffle others), Jan trying to keep his sanity while looking at bogus measurements, and the mystery of Babel to compound it all.............

Yep, I love this place.

Back to our regular entertainment.

Jocko
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Old 6th October 2003, 09:52 PM   #65
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Wink not quite.......

"Not only close, it is correct. Where on earth did you dig that up? Don't tell me you are studying swedish in secret."

No..... actually I am studying Swedes in public.
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Old 6th October 2003, 10:06 PM   #66
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Default Re: not quite.......

Quote:
Originally posted by Fred Dieckmann
[BNo..... actually I am studying Swedes in public. [/B]

I see. On this forum presumably.
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Old 7th October 2003, 05:43 AM   #67
dimitri is offline dimitri  United States
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Dear Jan,
“You thought you were measuring the regulator, but in effect you have been checking the dynamic impedance of a cap with parallel inductance with DC offset.”
No, I am measuring the regulator in practical setup. Would you measure audio amp with resistive load or nevertheless with real speaker?

“I have pleasure in trying to wring the last drop of performance from a circuit” Please be aware there are a lot of bottles in the cellar still…
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Old 7th October 2003, 08:52 AM   #68
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Dimitri,

I don't understand your answer. You are measuring the supply after 50cm of wiring. As I said, you reaslly measure the cap and the inductance of the wire, which appears in parallel with the cap. Whatever you measure doesn't say a lot about the quality of the supply. So, you'r not really measuring the supply. Don't take it personally.

This is apart from the fact that connecting a supply with 50cm of wire means you lose any high quality regulation that you could get from a Jung-type regulator. A standard 7815 is cheaper, easier and gives the same results.

Jan Didden
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Old 7th October 2003, 09:51 AM   #69
Electrons are yellow and more is better!
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Jan is right. Dimitri, you must establish where the regulator "ends" and where your test gear starts. I don't consider 50 cm wire as part of a regulator.

But once again it depends what you are really interested in to measure.
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Old 7th October 2003, 11:52 AM   #70
dimitri is offline dimitri  United States
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Let us consider typical preamp (mixer, RIAA, mic). We try to place active circuit board as near as possible near the input jacks, we even make gain control spindle longer. We try to place xformer with rectifier, caps and regulator as far as possible from the input jacks. What will be the length for dc supply wires, including pcb conductors? Ok, don’t like 50cm, ok, 20 cm. Somebody in this thread speak about square mm of pcb conductor and uV. How can we compensate wires – by 4 wire circuit, but what will be when we try to feed
multiple ICs? We don’t need ultimate parameters for two specific nodes on the regulator output, we need good parameters for the whole supply rail.

I personally use 4 wire circuit for the output op-amp, because I have now idea what it load will be. Other op-amps feed through RC filters, but I try to switch their output stage in class A (or to use op-amp with appropriate quiescent current). When I don’t have cost restriction I use precision regulator with normal bipolar output stage (not the single follower) operating in class A with quiescent current value higher, than will flow in the circuitry.
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