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Old 22nd May 2013, 03:15 PM   #601
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You can find rather complete information about the bridged amp here :
JGs Nobrainer and Nobrainer Discrete
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Old 22nd May 2013, 03:44 PM   #602
6.283 is offline 6.283  Germany
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Quote:
Originally Posted by peranders View Post
I wonder how many who will build Bruno's preamp?
I was wondering that too.

Hello, as a silent LA reader I am kind of new to the party.

Anyway, Mr. Putzeys article was very inspiring; really love it ! It has already generated further ideas.

Right now I have no need to build this pre-amp because I did a design based on the Bill Whitlock circuit the article refers to. But instead of the THAT chip I used a quad LM4562 (LME49740). I think it really works great from what I have measured so far (>= 100dB CMRR between 50Hz and 1KHz). I did not do a "source imbalance immunity" test yet, though. Too lazy and busy with speakers.
But maybe I can use the new knowledge to improve my pre-amp later.

Yet, I was wondering about the component tolerances of Mr. Putzeys circuit. Wouldn't the low pass section compromise the CMRR of the diff amp ? Or is it simply presumed to buy a bulk of each passive component in that area of the circuit and match them ? Or is it a non-issue that my hobbyist eyes don't see ?
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Old 22nd May 2013, 04:18 PM   #603
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Quote:
Originally Posted by 6.283 View Post
I was wondering that too.

Hello, as a silent LA reader I am kind of new to the party.

Anyway, Mr. Putzeys article was very inspiring; really love it ! It has already generated further ideas.

Right now I have no need to build this pre-amp because I did a design based on the Bill Whitlock circuit the article refers to. But instead of the THAT chip I used a quad LM4562 (LME49740). I think it really works great from what I have measured so far (>= 100dB CMRR between 50Hz and 1KHz). I did not do a "source imbalance immunity" test yet, though. Too lazy and busy with speakers.
But maybe I can use the new knowledge to improve my pre-amp later.

Yet, I was wondering about the component tolerances of Mr. Putzeys circuit. Wouldn't the low pass section compromise the CMRR of the diff amp ? Or is it simply presumed to buy a bulk of each passive component in that area of the circuit and match them ? Or is it a non-issue that my hobbyist eyes don't see ?
Just send me an email with your question/suggestion and I will forward it to Bruno and consider it for online posting.

jan
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Old 23rd May 2013, 05:47 AM   #604
6.283 is offline 6.283  Germany
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Thanks for the offer ! Will do (soon).
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Old 23rd May 2013, 03:18 PM   #605
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Quote:
Originally Posted by Joachim Gerhard View Post
I will use it to bridge power amps i designed for Holger Barskes solar panel project.
Joachim I just realized you probably need a balanced signal for that. Bruno's design is balanced impedance but not balanced signal wrt ground.

jan
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Old 23rd May 2013, 05:00 PM   #606
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I talked to Bruno today. Actually i will not finish this design until Frickelfest.
Some pads have lifted off due to my lesser abilities to stuff tiny SMD:
So i will use a Lundahl transformer now.
I may have talked Bruno into making stuffed boards though.
I think he will contact you about this.
Would be nice if that can be made available over Linear Audio.
Of cause this is not my decision but yours.
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Old 23rd May 2013, 05:04 PM   #607
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Thanks for the update Joachim, we'll keep in touch.
Have fun at the Frickle Fest!

jan
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Old 23rd May 2013, 05:04 PM   #608
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I think it would be cool to have an article on comprehensive amp testing for both stability and distortion. Just a thought.
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Old 23rd May 2013, 05:05 PM   #609
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Originally Posted by buzzforb View Post
I think it would be cool to have an article on comprehensive amp testing for both stability and distortion. Just a thought.
I have something like that in the pipeline.

jan
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Old 24th May 2013, 01:29 PM   #610
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Originally Posted by jameshillj View Post
Is anyone's else building Doug Self's Tone control circuit and a pcb?
Me.

I also have plans for Bob Cordell's Vinyl Trak
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