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John Curl's Blowtorch preamplifier part II
John Curl's Blowtorch preamplifier part II
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Old 12th August 2017, 11:35 PM   #95111
Wavebourn is offline Wavebourn  United States
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John Curl's Blowtorch preamplifier part II
I recently had to buy a trigonometry book. I forgot it!
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Old 12th August 2017, 11:43 PM   #95112
anatech is offline anatech  Canada
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John Curl's Blowtorch preamplifier part II
I'm so sorry for you!
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Old 13th August 2017, 12:36 AM   #95113
scott wurcer is offline scott wurcer  United States
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John Curl's Blowtorch preamplifier part II
Quote:
Originally Posted by simon7000 View Post
Global feedback introduces a time delay equal to the actual propagation delay times the open loop gain divided by the closed loop gain.
Is that how to compute how many times the feedback has to go around and around?
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Old 13th August 2017, 12:56 AM   #95114
spaceistheplace is offline spaceistheplace
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Default John Curl's Blowtorch preamplifier part II



It's a play on a U2 squadron slogan "In god we trust, all others we monitor." (Or perhaps the other way around?)
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Last edited by spaceistheplace; 13th August 2017 at 01:00 AM.
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Old 13th August 2017, 04:16 AM   #95115
john curl is offline john curl  United States
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I wish that I had studied trigonometry more diligently in high school, but I was having too much fun. I had to relearn it later while studying calculus. I'm sure that I have forgotten most of it once again.
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Old 13th August 2017, 05:14 AM   #95116
Wavebourn is offline Wavebourn  United States
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John Curl's Blowtorch preamplifier part II
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Originally Posted by john curl View Post
I wish that I had studied trigonometry more diligently in high school, but I was having too much fun. I had to relearn it later while studying calculus. I'm sure that I have forgotten most of it once again.
"If you don't use it you lose it"
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Old 13th August 2017, 05:37 AM   #95117
DPH is offline DPH  United States
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Originally Posted by spaceistheplace View Post
It's a play on a U2 squadron slogan "In god we trust, all others we monitor." (Or perhaps the other way around?)
I'm betting the other way around, given the original quote I believe precedes U2's construction in the mid-50's. In either case the aphorism was probably making the rounds, Deming or otherwise.
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Old 13th August 2017, 07:32 AM   #95118
jan.didden is offline jan.didden  Europe
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Quote:
Originally Posted by john curl View Post
I may be a bit old fashioned, but I am deadly serious about books, technical journals, and data sheets. I live amongst them continually. I also have wall to ceiling bookshelves in several rooms with physics on one side and electronics engineering on the other. I love serious textbooks, sometimes even books that I can just barely read, ( just to show me my place in the education system) and keep me on my toes.
Of course, the internet is starting to replace the need for many of the books that I keep on my shelf, but certainly not the majority of them.
+1. I started to buy used/2nd hand engineering books from last century even though I have them as PDFs on my system. Nothing beats the feel (and with old books, the smell) of a bunch of printed sheets.
I am a book fetish. Among others

Jan
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Old 13th August 2017, 03:59 PM   #95119
RNMarsh is offline RNMarsh  United States
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John Curl's Blowtorch preamplifier part II
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Originally Posted by Wavebourn View Post
"If you don't use it you lose it"
When I was in college... I learned all about tubes and TV and test equipment were tube based..... trouble-shot and fixed a lot of tube test equipment and audio- video. First audio was all tubes, scratch built. Then I had to learn transistors and go thru all that learning. Then it was DTL and TTL and then more integrated IC's and then cmos and RF and on and on it goes. I have forgotten more than I can actively remember.

So when some one over here says to go learn this or that ... EE101 or something like that, I am not inclined to spend a lot of time unless it is something I really need to know for a project or test because I know it will be quickly forgotten to be replaced by another technology very soon. I prefer to rely on the library or ask someone who is currently in that field.

Time gets shorter by the day.


THx-RNMarsh

Last edited by RNMarsh; 13th August 2017 at 04:04 PM.
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Old 13th August 2017, 04:08 PM   #95120
dadod is offline dadod  Croatia
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Quote:
Originally Posted by RNMarsh View Post
When I was in college... I learned all about tubes and TV and test equipment were tube based..... trouble-shot and fixed a lot of tube test equipment and audio- video. First audio was all tubes, scratch built. Then I had to learn transistors and go thru all that learning. Then it was DTL and TTL and then more integrated IC's and then cmos and RF and on and on it goes. I have forgotten more than I can actively remember.

So when some one over here says to go learn this or that ... EE101 or something like that, I am not inclined to spend a lot of time unless it is something I really need to know for a project or test because I know it will be quickly forgotten to be replaced by another technology very soon. I prefer to rely on the library or ask someone who is currently in that field.

Time gets shorter by the day.


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