John Curl's Blowtorch preamplifier part II

[janneman]

Originally Posted by scott wurcer

[snip] It was considered unpublishable as an application.

Of course, god saves us from people leaving the trodden road. Safer to stay with the 30+ years old stuff

jd

[dimitri]

putting 1/2 the DC RIAA resistor to ground

agreed, this will work, floating (differential) RIAA network across pin 8's - wouldn't

[john curl]

It is still: The three phases of an idea.

1. It won't work. Too much distortion, gain instability, etc
2. It works, but it is not important. Tested it at X100, didn't bother to follow up.
3. We invented it. I would have done it even better and quieter, if I really wanted to.
How about that everyone?

[Bob Cordell]

Originally Posted by john curl

look at fig 3, Bob, and tell me what you see. Can YOU give the source of every 'blip' on the screen?

I see a blip. So what? I certainly can't give a source for every blip on the screen. That is your responsibility because you are the one asserting that it distinguishes TIM from PIM. I don't know that it does, and I don't think you do either.

Cheers,
Bob

[scott wurcer]

Pretty mean spirited response for a few of us throwing around ideas. Yes, Walt and I played around with a bunch of "using op-amps open-loop" ideas. They weren't really of general interest in real instrumentation.

[janneman]

Originally Posted by scott wurcer

Pretty mean spirited response for a few of us throwing around ideas. Yes, Walt and I played around with a bunch of "using op-amps open-loop" ideas. They weren't really of general interest in real instrumentation.

Scott, to make myself clear in case this was referred to my earlier response, I wasn't referring to you but to 'management' in general. I know you like to explore the untrodden road. Wish I had such a wide brain as you have...

cheers,

jd

[john curl]

Bessel function re FM modulation? Bob.

[Wavebourn]

Originally Posted by janneman

Uhhh.... making $ 24800 with a $8 opamp?

Like, "$1 for knocking the nail, and $999,999 for knowing which one to knock".

[Bob Cordell]

Originally Posted by john curl

Bessel function re FM modulation? Bob.

John, you are name-dropping again:-)

Yes I remember Bessel functions and the accompanying pain. You did not read my earlier post very well. I stated that any PIM distortion was akin to narrow-band fm. Go look up narrow band fm. The Bessel functions devolve to linear functions at low deviation.

Bob

[john curl]

The extra distortion products appear to follow a low order Bessel function, which is superimposed on the normal IM byproducts. Anyone out there have enough knowledge to contribute to this discussion?