John Curl's Blowtorch preamplifier part II - Page 2334 - diyAudio
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Old 27th May 2012, 02:01 PM   #23331
gerhard is offline gerhard  Germany
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And if you need a small low noise reference voltage to bias sth
in your signal path, a red LED is usually a good choice.

Gerhard
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Old 27th May 2012, 03:09 PM   #23332
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Quote:
Originally Posted by jam View Post
Chris Sugar has made a valid observation not so much in the defense of John Curl so are some of you going to ridicule him because of it or is refuting everything John Curl says the main sport of the day.
Indeed.
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Old 27th May 2012, 03:13 PM   #23333
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Originally Posted by jcx View Post
John could have articulated his reasoning - stated 2 resistors can give RF/EMI ingress protection
John Curl owes none any length of explanation. Some people are just in the hobby of ridiculing him.
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Old 27th May 2012, 03:14 PM   #23334
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Originally Posted by Wavebourn View Post
Yes, it illuminates what happens when Prodigy Pro guys copy different parts of different examples of famous equipment mixing them together.
Who are you referring to?
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Old 27th May 2012, 03:19 PM   #23335
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Quote:
Originally Posted by jam View Post
So Mr.Curl does not want to use an led.........lets not make a federal case out of it.
You are pulling the rug under the feet of some people here.
Some people here have a vendetta condemning everything and everyone who, to their view, addresses things which are outside what they consider as 'good engineering'. When they are confronted with aspects which aren't included in what they consider as 'good engineering', they attack.
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Old 27th May 2012, 03:27 PM   #23336
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Originally Posted by Wavebourn View Post
Forward biased by 10 mA current diode demodulates RF inside of the box full of semiconductor devices with nanoamp input currents?
The diode's bias doesn't eliminate RF on the diode's return from polluting the 'ground' of the PSU and thus the entire amp.

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Originally Posted by Wavebourn View Post
Don't make my slippers laugh please. Most probably that innocent LED was soldered to the ground in wrong place, so it's wire acted as antenna.
Possibly, as much as possibly RF presented at any point of the amp's 'ground' will have the same negative effect.
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Old 27th May 2012, 03:31 PM   #23337
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Originally Posted by SY View Post
No-one attacked John, they (and I) attacked some very odd and apparently incorrect ideas he put forth. That's why it's called a "forum."
'Incorrect ideas' to your own view. Your own view doesn't make any idea correct or incorrect, outside of your own mind.
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Old 27th May 2012, 03:35 PM   #23338
DF96 is offline DF96  England
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Quote:
Originally Posted by Joshua_G
The diode's bias doesn't eliminate RF on the diode's return from polluting the 'ground' of the PSU and thus the entire amp.
So you agree that it is probably the wire and not the LED which creates any problems? That is all we were saying. So what we said was probably correct, but it was wrong for us to say it as that is disrespectful to the guru?
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Old 27th May 2012, 03:48 PM   #23339
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Originally Posted by DF96 View Post
So you agree that it is probably the wire and not the LED which creates any problems? That is all we were saying. So what we said was probably correct, but it was wrong for us to say it as that is disrespectful to the guru?
The problem was caused by the fact that there was a LED in the front of the speakers, outside the faraday cage. The fact the RF entered the amp through the LED's wires is a side issue, it is obvious the LED didn't produce RF pollution, it only enabled RF entering the amp, via its' wires.
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Old 27th May 2012, 03:57 PM   #23340
KBK is offline KBK  Canada
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Quote:
Originally Posted by SY View Post
OK, let me get this straight.

- The supplies in the BT are so poor that a 5mA current will "unbalance" them.
- Series connections between rails require resistors on each side, ignoring Kirchoff's law
- If a known crazy person says that she can "hear" a 5mA device with insanely low noise connected nowhere near a signal path, that should be the primary engineering consideration
- RFI (or some other emanation) that has never been detected in the physical universe should be addressed by bypass caps

And you wonder why I'm cynical about fashion "high end audio"?
I'm cynical about your professed level of audio knowledge and understanding.

Look at the human hearing mechanism.

Then consider that the minutest change in the most minute aspects of transient function is the single core component of signal that the ear utilizes and decodes.

Thus, every bit of what the signal does in order to get to that point where the transient is supported and 'placed exactly and correctly as it must be in time, shape, and level', all of it becomes critical.

Ultra critical, down to the micro level, in relation to another given micro level ....and in relation, on the micro level, to all the macro level that needs to be, at minimum, as correct.

Look at how an LED deals with transient function, regarding V and A and see what it reflects back to the power supply.

And if any sort of feedback regulation, or feedback of any kind is used, then said feedback it is chasing the horse AFTER it has left the barn and thus is over correcting a mistake, into being another mistake. specifically with respect to those all important micro levels.

Then, those micro levels are slewed in time and level, and thus the ear hears them as as a separate and elevated noise, and among the less aware, they will confuse this with detail information. When it is actually..distortion. (depending on the aspects of the correction, it might be interpreted as a lack of information and/or darkness)

Last edited by KBK; 27th May 2012 at 04:06 PM.
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