100W Audio Amplifier

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100W Audio Amplifier
http://worldtechnical.blogspot.com/2008/12/100w-audio-amplifier.html

 

[Eeyore]

100W Audio Amplifier

 

[Phil Allison]

"John Larkin"

That circuit can't work, of course.

** A drawing error in a schem never stopped a circuit working.

( Q5 is erroneously shown with its base & emitter linked )

What is about about audio that brings out the worst electronics?

** So it brought a PITA troll like you out.

Bad stammer you have there .....



...... Phil

 

[Eeyore]

That circuit can't work, of course. What is about about audio that
brings out the worst electronics?

Simple. DJs. Plus their desire for thecheapest and mankiest gear in the
world.

Real pro-audio would make your mouth drop John.

Graham

 

[Eeyore]

It might affect you that way. John is an engineer.

John would be SERIOUSLY impressed. There are few markets where the standards
are so high, and the average jobsworth hasn't a clue.

If he wants to come over here, I can get him invitations to some of the best
studios around. They are STUNNING.

Graham

 

[[email protected]]

"John Larkin"





** A drawing error in a schem never stopped a circuit working.

( Q5 is erroneously shown with its base & emitter linked )


** So it brought a PITA troll like you out.

Bad stammer you have there .....

..... Phil

and in the second schematic base of Q3 is connected to -Vcc

-Lasse

 

[Eeyore]

Yawn. You couldn't get the security clearance to go some of the
places John does. You audiofools are all alike...

Really ? I've been in the Admiralty Research Establishment in Portsmouth for
example.

Graham

 

[Eeyore]

Audio is just all the same old
stuff, over and over. What could be stunning, the enormous number of
colored knobs? Speakers upholstered in the finest naugahide? Chrome
panels with Gothic type fonts?

You've OBVIOUSLY not been in one.

You'd probably be more impressed by the 'machine rooms' though.

Graham

 

[Eeyore]

Big deal.

Yes it was.

Graham

 

[Eeyore]

You are easily entertained.

Radar is indeed entertaining.

Graham

 

[Eeyore]

It was, for a few weeks when I was in Jr. high school. I worked in a
building with a pair of 2 MW Westinghouse RADAR systems while in the US
Army. It was nothing but rack after rack of tubes and a half dozen techs
working around the clock to keep both systems working. It was hot,
noisy, and boring.

This wasn't. It was microprocessor controlled and low power by your
standards. It was popularly know as 'the Rine River Radar' It has 50%
'look-ahead' too btw.
http://en.wikipedia.org/wiki/Rhine

The job was for Kelvin Hughes.
Their then Managing Director is one of my referees. He's moved on a bit
since !
http://www.ibd-uk.com/members/jones-martin.htm

Qualifications:
B.Sc. (Tech), M.Sc., Ph.D. Chartered Physicist. Member, Institute of
Physics, Institute of Acoustics, Audio Engineering Society.
Languages: rusty French and a little German.

A damn nice guy too. We still keep in contact.

Graham

 

[Eeyore]

Basic RADAR is less complex than a $10 B&W TV set. You send a pulse.
You receive a pulse, which is 'detecting'. You measure the delay for
"ranging'. To get relative position data you use a steerable antenna or
array. Its all been done by multiple groups for over 60 years. Adding a
microprocessor is no big deal. That has been done to almost anything
with electrons for almost 35 years.

Doing it with a resonant spiral scan system on the tube to keep the data in r,
theta coordinates was interesting though.

Graham

 

[Eeyore]

Idiots are 'blown away' with lots of shiny beads & baubles. Anytime I
want to remind myself why I got out of audio all I need to do is visit
the only place in the are that repairs pro audio and look at the inside
of that chrome & plastic.

PRO audio isn't chrome and plastic. That's MI.

Graham

 

[Eeyore]

Not as much as the mechanical system that rotated the CRT. 400 Hz
Syncros at the antenna and display unit were used to keep them locked.
Considering what was available at the time, THAT WAS REAL ENGINEERING.

Yes, I've seen one of display units of that sort.

Precious little other way it could be done then for a PPI. I was stunned to discover
the concept was dreamt up in the late 30s IIRC.

Graham

 

[Rich Grise]

Not as much as the mechanical system that rotated the CRT. 400 Hz
Syncros at the antenna and display unit were used to keep them locked.
Considering what was available at the time, THAT WAS REAL ENGINEERING.

In the ones I've seen diagrams of, all that they rotated was the yoke.

If you rotated the whole CRT, it would have one trace on the same line
of the screen forever, until it burned the phosphor off. =:-O

Cheers!
Rich