Re: ONE repair in all my years...


"Trevor Wilson" <trevor@xxxxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message
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"Arny Krueger" <arnyk@xxxxxxxxxx> wrote in message
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"Trevor Wilson" <trevor@xxxxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message
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"Arny Krueger" <arnyk@xxxxxxxxxx> wrote in message
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"ScottW" <ScottW48@xxxxxxxxxxx> wrote in message
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On Oct 18, 11:40 am, "Arny Krueger" <ar...@xxxxxxxxxx> wrote:
"ScottW" <Scott...@xxxxxxxxxxx> wrote in message

Here's a reputable app note on high speed digital
circuits which have far greater need .....
http://hsi.web.cern.ch/HSI/s-link/devices/g-ldc/decouple.pdf

Wrong again Scott. You need to read and understand the titles of
articles.
The article is titled:

"Using Decoupling Capacitors"

It is a fine article as far as it goes.

Except the application as described is very much in line
with your article describing bypass caps.

I've further explained the similarities and differences between
decoupling
and bypass caps in another post I made after this one.

Arny says....

"Decoupling circuits generally include a series element, the output
end of
which is connected to a capacitor that is grounded at the other end.
The
series element can be either a resistor or an inductor."

But he also says, "It is a fine article as far as it goes."

IOW, it omits some relevant facts, like the series element in
decoupling networks.

There is no series element shown in the Cypress article
on decoupling...

They omitted it.

The series element is always there, whether there is a standard
component present or not. Sometimes the series element is the
resistance or inductance of a wire or a circuit board trace.

**LOL! I told you that.

Really?

**Yeah, really. Here are my PRECISE words:
---
**They're decoupled, you clown. The resistance of the PCB tracks and
wiring,
in combination with the caps acts as a high pass filter. Get back to me
when
you've studied some electronics theory.
---

Trevor, your insults are childish and unworthy of you. You know very well
that I studied electronics theory about 45 years ago.

You correctly pointed out my typo. I should have said: "...LOW pass
filter..."

Trevor, you should watch your tongue - it makes you look foolish.

You also told us that those op amps in the Denon AVR 485 receiver had
individual decoupling networks for each op amp, and that each op amp had
its own power supply decoupling electrolytic caps. This turned out to be
false.

**I listed 25 models which used decoupling caps on OP amps.

Trevor, you also told us that we could find schematics for those 25 models
on http://www.hifiengine.com. This turned out to be almost entirely false.
Then we narrowed you down to the AVR 485, and promptly found that the op
amps you mentioned had only individual ceramic bypass caps, not individual
electrolytic decoupling caps as you claimed.

This whole discussion started out with an attempt to show real world
electronic components where the number of electrolytic caps had proliferated
because every op amp had 2 electrolytic decoupling caps.

Trevor, using your hand-picked receiver the Denon AVR 485, we found that
there were only 2 electrolytic caps for a group of 7 op amps. Furthermore,
the op amps were packaged in a common way - 2 per package. That means that
even the ceramic bypass caps were only installed at the rate of 1 per op amp
even though both plus and minus power supplies were used.

How many ways do we have to disprove your claims, Trevor?


.

Relevant Pages

  • Now, first things, first. Re: Filter caps effect on tone ???
    ... thanks all I'll consider replacing the caps. ... This amp now sounds better than it ever did but the hum is still ... Find some old high school books on basic vacuum tube electronics, ...
    (alt.guitar.amps)
  • Re: Valve amp fault - nasty buzz
    ... My HRD has developed a fault and I'm pretty good with electronics, ... The recording was done with nothing plugged into the amp. ... With the amp on the clean channel, you can hear a little output from ... and all the big electrolytic caps. ...
    (sci.electronics.repair)
  • Re: Valve amp fault - nasty buzz
    ... My HRD has developed a fault and I'm pretty good with electronics, ... The recording was done with nothing plugged into the amp. ... With the amp on the clean channel, you can hear a little output from ... and all the big electrolytic caps. ...
    (sci.electronics.repair)
  • Re: ONE repair in all my years...
    ... **Completely impractical for decoupling. ... In power supplies.....which is a fine place for electrolytics. ... caps into a case and there won't be much room for anything else. ... power supply rails at each OP amp, or amplifier stage within a product. ...
    (rec.audio.opinion)
  • Re: ONE repair in all my years...
    ... Or, in the case of a tube amp, when the Cathode is ... appears to contradict each other...Cypress uses decoupling ... AVR485 has numerous OP amps which are decoupled, using electros. ... have been used as bypass caps as well. ...
    (rec.audio.opinion)