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John Curl's Blowtorch preamplifier part II
John Curl's Blowtorch preamplifier part II
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Old 31st March 2012, 12:04 AM   #21871
scott wurcer is offline scott wurcer  United States
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Quote:
Originally Posted by john curl View Post
The two previous messages are made as offering something to talk about.
What's shown looks like a comparator. The outputs are railed one way or the other.
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Old 31st March 2012, 12:15 AM   #21872
john curl is offline john curl  United States
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And YOUR circuits are NOT 'railed' without a feedback loop or servoing?
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Old 31st March 2012, 12:52 AM   #21873
scott wurcer is offline scott wurcer  United States
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Originally Posted by john curl View Post
And YOUR circuits are NOT 'railed' without a feedback loop or servoing?
So this is not a complete circuit, we do not know how much feedback is used or the closed loop configuration.
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Old 31st March 2012, 12:58 AM   #21874
john curl is offline john curl  United States
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An alternative circuit, slightly more complete. Good for comparison.
Attached Images
File Type: jpg alternative topology.jpg (199.6 KB, 193 views)
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Old 31st March 2012, 01:04 AM   #21875
scott wurcer is offline scott wurcer  United States
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Quote:
Originally Posted by john curl View Post
An alternative circuit, slightly more complete. Good for comparison.

But that's not even remotely full complimentary symmetry.
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Old 31st March 2012, 01:11 AM   #21876
martin clark is offline martin clark  Europe
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Originally Posted by ThorstenL View Post
... I find words that remain in active use in english but have left the general use in German.


OT, but you don't have to look too hard to find some real throwbacks in English as it is spoken.

Everyday example here in Somerset* a common greeting is 'Owbist?' It's a C9-10th Anglicisation of the German 2nd person participle of Sein, 'to be'.


*For non-English speakers: this word contains at least two Z sounds, the longest 'ee' ever, separated by a rhotic prolonged beyond adolescence. Zumm-eerr-zet.

Zider'I up, Landlord....

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Old 31st March 2012, 01:15 AM   #21877
john curl is offline john curl  United States
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No, but it is a more COMPLETE circuit. I recommend R.G Meyer's 'Analysis and Design of ANALOG INTEGRATED CIRCUITS' pp. 195 and 286 for example. The original 'topology' put up is called a 'subcircuit' (p.195) and is commonly used in analysis of analog circuits. It is the BASIS of more complex circuits, where the CORE of the design is lost in the 'housekeeping'. I would like to talk about the CORE of the design first, especially for newbees, both its advantages and disadvantages.
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Old 31st March 2012, 01:46 AM   #21878
Wavebourn is offline Wavebourn  United States
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John Curl's Blowtorch preamplifier part II
Quote:
Originally Posted by scott wurcer View Post
What's shown looks like a comparator. The outputs are railed one way or the other.
Not necessary. It can be used as a trigger also, good one, from rail to rail, it fo add couple of resistors. Very nice to eliminate bouncing of contacts of buttons and micro switches.

Also, half of such thingy I used long time ago for a guitar effect, with couple of diodes in feedback.
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Old 31st March 2012, 02:56 AM   #21879
hitsware is offline hitsware
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Quote:
Originally Posted by john curl View Post
No, but it is a more COMPLETE circuit. I recommend R.G Meyer's 'Analysis and Design of ANALOG INTEGRATED CIRCUITS' pp. 195 and 286 for example. The original 'topology' put up is called a 'subcircuit' (p.195) and is commonly used in analysis of analog circuits. It is the BASIS of more complex circuits, where the CORE of the design is lost in the 'housekeeping'. I would like to talk about the CORE of the design first, especially for newbees, both its advantages and disadvantages.
The 'CORE' begs to have a ground (0V)
at the center
(between the resistors up(and down) to
the sources of the input xsistors
(other than the synthetic one(ground))
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Old 31st March 2012, 03:11 AM   #21880
john curl is offline john curl  United States
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I have been designing this circuit for 40 years, and it works, WITHOUT a ground at the center. I has worked for dozens of designs, including 2 that have an A rating in the latest April 1012 'Stereophile', so maybe it is a little more sophisticated than what you might first think.
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