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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 17th July 2019, 09:31 PM   #821
Hans Polak is online now Hans Polak  Netherlands
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Quote:
Originally Posted by trung224 View Post
@jan.didden

Thank you for your answer. I received the BPPBP board last week, and now need to decide which power supply and potentionmeter to use for this project.

Today, I find a schematic for one PSU, which was called GRLV and developed by Kevin Gilmore based on Walt Jung's design.
I would be very grateful if someone with deep knowledge like you could comment some opinion about it

Click the image to open in full size.
This design deserves the price for putting the maximum amount of components into a PS.
It will work without a doubt, but a Jung-Didden PS or a silent switcher will be at least as good.

Hans
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Old 17th July 2019, 10:34 PM   #822
misterdog is offline misterdog  United Kingdom
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Originally Posted by trung224 View Post
What regulator do you use in your BPPBP?
Both sq225917 and myself use the Hypex regs with our DC supplies.
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Old 17th July 2019, 10:42 PM   #823
trung224 is offline trung224
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@misterdog

Thanks for your answer. I have one more question, which potentiometer do you use?
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Old 18th July 2019, 02:44 AM   #824
alexcp is online now alexcp  United States
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BPPBP - Bruno Putzey's Purist Balanced Preamp (well a balanced volume control really)
I use Vishay P9 (conductive plastic) with excellent results. The pot specified in the article (PTD902) also works well but gives a little more noise.
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Old 18th July 2019, 09:28 AM   #825
misterdog is offline misterdog  United Kingdom
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@ alexcp - do you have the part number for that Pot.
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Old 18th July 2019, 10:49 AM   #826
trung224 is offline trung224
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I think it could be this one P9A2R100FISX1103MA
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Old 18th July 2019, 06:36 PM   #827
alexcp is online now alexcp  United States
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BPPBP - Bruno Putzey's Purist Balanced Preamp (well a balanced volume control really)
Correct, it is P9A2R100FISX1103MA.
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Old 18th July 2019, 07:10 PM   #828
sq225917 is offline sq225917  United Kingdom
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Send a message via MSN to sq225917 BPPBP - Bruno Putzey's Purist Balanced Preamp (well a balanced volume control really)
I've tried half a dozen pots started with the bom part, tried khozmo ladder and shunt stepped pots, ended up with a tkd 601. Which is better than all of them. Less hassle than the rc Khozmo pots which all ended up picking up noise and better channel balance than any other pot I tried, 1% across the full range.
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Old 18th July 2019, 07:23 PM   #829
trung224 is offline trung224
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@sq225917,@alexcp : Thanks for your input

@sq225917
Since the TKD 2CP-601 is log potentiometer, I would like to ask how much you can rotate it in your BPPBP.
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Old 16th August 2019, 04:57 AM   #830
Bennyboyph is offline Bennyboyph  United Kingdom
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Built this great preamp, but the actual volume control occurs in a very small radius of the pot. The standard pot as per BOM seem to have a large amount of channel mismatch, also.

What are my options for having a wider range of volume control with equal attention (I know it doesn't actually attenuate the audio signal)?
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