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Analog Line Level Preamplifiers , Passive Pre-amps, Crossovers, etc.

BPPBP - Bruno Putzey's Purist Balanced Preamp (well a balanced volume control really)
BPPBP - Bruno Putzey's Purist Balanced Preamp (well a balanced volume control really)
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Old 8th September 2015, 02:59 PM   #21
jcx is offline jcx  United States
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I would’ve used the Whitlock’s input chips and implemented the capacitive bootstrap technique as well, except that the distortion performance is not good enough in my view.
just a statement of LM4562 linearity vs THAT chip designed decade earlier, undoubtedly on an a open fab process from that era

the bootstrapping shouldn't have any additional distortion consequence - in fact should reduce most of the cap's nonlinearity and DA effects for the common mode leaving even less to diff out

Last edited by jcx; 8th September 2015 at 03:07 PM.
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Old 8th September 2015, 03:01 PM   #22
AndrewT is offline AndrewT  Scotland
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I did not see any limits on maximum gain, nor on maximum attenuation, achievable with the active gain block. Have I missed that?
Are there some limiting resistors built into the PCB?
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Old 8th September 2015, 03:09 PM   #23
Bertel is offline Bertel  Germany
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Originally Posted by AndrewT View Post
I did not see any limits on maximum gain, nor on maximum attenuation, achievable with the active gain block. Have I missed that?
Are there some limiting resistors built into the PCB?
Jan had pointed out that in fact there aren't any in the design, probably in order to not mess up the perfect tracking only dependent on rotation angle of the pot with both channels on the same spindle. There was an alternative approach which Jan had offered to share shortly.
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Old 8th September 2015, 03:14 PM   #24
Bertel is offline Bertel  Germany
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Originally Posted by jcx View Post
just a statement of LM4562 linearity vs THAT chip designed decade earlier, undoubtedly on an a open fab process from that era

the bootstrapping shouldn't have any additional distortion consequence - in fact should reduce most of the cap's nonlinearity and DA effects for the common mode leaving even less to diff out
I see - that's indeed very interesting!

I suggest we keep track of potential design enhancements or variations for kind of a "version 2.0". Currently we have two already - Whitlock's diff amp input common mode bootstrapping, and alternatives to pot / limiting resistors

Last edited by Bertel; 8th September 2015 at 03:20 PM.
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Old 8th September 2015, 04:07 PM   #25
Bertel is offline Bertel  Germany
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Alright, I have set up an Excel Online sheet to collect current interest.

Please go to http://1drv.ms/1JPOfR6 , enter your username and the amount of 'bare' PCBs and/or fully built modules you are interested in. No obligation for now, just to collect an estimate on cost and volumes.

Thank you,
Robert
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Old 8th September 2015, 05:12 PM   #26
av-trouvaille is offline av-trouvaille  Netherlands
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+1
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Old 8th September 2015, 05:57 PM   #27
BigE is offline BigE  Canada
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How many modules are needed for stereo?
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Old 8th September 2015, 06:03 PM   #28
Bertel is offline Bertel  Germany
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Originally Posted by BigE View Post
How many modules are needed for stereo?

The modules are stereo, so one.
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Old 8th September 2015, 08:52 PM   #29
Joachim Gerhard is offline Joachim Gerhard  Germany
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I am building a P - P with some small changes.
It should play tomorrow.
Lonesome but faster ....
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Old 8th September 2015, 09:20 PM   #30
billshurv is online now billshurv  United Kingdom
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BPPBP - Bruno Putzey's Purist Balanced Preamp (well a balanced volume control really)
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Originally Posted by jan.didden View Post

BTW I had 1000 free boards which are all given out

Jan
Would be interesting (and probably impossible) to find out how many were build from that 1000 and how many are lingering in drawers.
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