John Curl's Blowtorch preamplifier part II

Status
Not open for further replies.
Jump to Latest
#23,884
jneutron said:
Susceptibility to external influence is generally broken into two categories, when the victim has an impedance below 377 ohms, and when it is above 377 ohms. That is the free space impedance for planar wave propagation.

Above, capacitance is generally the domimant, below magnetic dominates. I believe that was also included in the Tom Van Doren link I provided earlier.


I kind of think it's more for dissipation. These puppies are getting harder and harder to keep cool, and the capacitive energy storage of the gates goes as the voltage squared. (cmos)


jn
Click to expand...

377: Thanks jn
capacitive energy storage of the gates goes as the voltage squared. (cmos): OK. But does this produces heat?
Tom Van Doren link: I missed it and I can’t find it.😡



scott wurcer said:
Sorry George it's known as full court press time, you sent your designs to fab and surprise, surprise they work. It's 24/7 work right now, not audio but good stuff. I think others have capture the gist, there is a transition from lumped to continuous models that requires judgement based on several factors. Importantly the skin effect is fractional f in nature and does not plug into a normal simulation environment.
Click to expand...

It’s good to know that good stuff exists 😀 outside of audio.
On a later time when you will be less overworked, we will revisit the issue (surface charges distribution rel. time). You do have the charisma to hint to important thinks in a minimum of words :yes:


SY said:
I wish. 🙁 He's working, I'm packing up house for a move.
Click to expand...

I hope you don’t hate packing up as much as I do.
Wish you well.:xfingers:

George
 
#23,885
Example of AP graphics.
 

Attachments

  • gr example.jpg
    gr example.jpg
    173.2 KB · Views: 239
#23,892
John:
What do you want to see that the AP plot does not show? The .01 dB lines are missing but I believe they can be added. Further it can be imported to Excel with lots of plotting options. More important is presenting the important data clearly. The LF region below 200 Hz is -.3 dB at 30 Hz max. in the plot. Do you need more detail?
 
#23,895
While Parasound can afford it they won't supply John. Its the curse of being a consultant.

I can't afford an AP and would get thrown out of the house if I did buy an AP. The ROI is not high enough. The Boontons cost less than $300 (My max budget for any of this stuff) and have a low enough distortion floor for most applications. If it were important there is usually a way. For bench work any box that is working OK is good enough since real world products are no better than these measurement systems. Its just that age and abuse from the original owner usually takes a major toll on the stuff.
 
#23,898
1audio said:
While Parasound can afford it they won't supply John. Its the curse of being a consultant.
Click to expand...

Consultant my ***. Parasound's entire Halo line centers on John's celebrity. John's abilities as a designer are a distant second as far as Parasound's concerned.

JC 3: John Curl’s newest phono preamp design
JC 2: Audio circuits designed by John Curl & CTC Builders
A 51: Circuitry designed by legendary John Curl
A 52: Circuitry designed by legendary John Curl
A 31: Circuitry designed by legendary John Curl
JC 1: Designed by legendary John Curl and CTC Builders
A 21: Circuitry designed by legendary John Curl
A 23: Circuitry designed by legendary John Curl

John's selling his celebrity. That's leverage. "No AP, no JC. Oh yeah, and no brown M&M's!"

John's a celebrity. He needs an agent.

se
 
#23,899
Last edited:
Status
Not open for further replies.
Top Bottom