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Old 22nd December 2010, 12:54 PM   #2051
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I'm not into honors, Pavel.

Shame to see intelligent people get all worked up, much ado about nothing.
A 10-day recess should suffice, no ?
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Old 22nd December 2010, 01:01 PM   #2052
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I hope they did not (get all worked up)
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Old 10th January 2011, 09:40 PM   #2053
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For the record:

I build the circuit posted here.
I use it as a prepre for my ADC and do the riaa thing in sox, a sound effect and filter software for linux. The riaa filter is a IIR-Filter set, which has the same phase response as an analog riaa would have if it where perfect.

I never had such success, soundwise. Unbelievable.

It is very accurat in the mids and fast&firm in the bass. Sweet.

Rüdiger
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Old 11th January 2011, 05:42 AM   #2054
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Rüdiger, please, correct the link, Thanks.

Quote:
Originally Posted by Onvinyl View Post
For the record:

I build the circuit posted here.
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Old 11th January 2011, 08:24 AM   #2055
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I don't think the single ended input stage followed by an op-amp is new as shown by Jochaim and Syn08. As a number of people have noted, this topology goes back many years (into the 90's and maybe earlier). Taking an existing idea and developing it further, or simplifying it is all part of engineering and progress. Is Bob Cordell a rip- off artist because he dares to publish a blameless type design without bowing and scraping to Doug Self? Did Douglas Self 'steal' the Lin topology and rebrand it the 'blameless'? Where do do you start and stop? Jochaim's circuit in my view is absolutely not a rip-off. Period.

I think Syn08 is a great engineer, but on this one he is way off the mark I am afraid. Unless you are prepared to actually patent something, I am afraid you cannot get upset over circuit similarities like this - it happens ALL the time in the electronics industry. If you absolutely do not want anyone to do anything similar then don't pusblish your efforts - its that simple.

Having said that, what really does **** me off is when you publish a circuit and PCB layouts and 2 weeks later it pop's up on ebay courtesy of some guy in a shed on the other side of the planet. Now that's something to get upset about. And what can you do about it? Pretty much nothing unless you are a big corporation with deep pockets.
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Old 11th January 2011, 08:09 PM   #2056
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instead of a link, here is what I use.

Rüdiger
Attached Images
File Type: jpg JGbalanced.jpg (250.1 KB, 477 views)
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Old 11th January 2011, 08:13 PM   #2057
Salas is online now Salas  Greece
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I like the local mini current mirror shunts for the cascode. Are they fed by a bigger common regulator?
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Old 11th January 2011, 08:17 PM   #2058
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Hi Salas,
I thought you would like it...
Of course, I stole them from juma.
At the moment, I use Lead batteries, but salasstyle shunts are on their way



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Last edited by Onvinyl; 11th January 2011 at 08:20 PM.
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Old 11th January 2011, 08:21 PM   #2059
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Its the first implementation of the current mirror reg version in full TO-92 and I think that it was a very clever idea to adopt for the cascode base bias. Good work.
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Old 17th January 2011, 09:48 PM   #2060
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By 1975 Mike Wright of Dayton Wright had developed a discreet, bootstrapped cascode differential input stage with a constant current source as an phono input stage which fed a UA749 op amp which also had a feedforward transistor
picking up it's signal at the opamp's compensation pin to extend the class A operating point.
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