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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 May 2020, 02:05 AM   #931
noviygera is offline noviygera  United States
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Last question regarding transformer:
Toroidal or regular one?

Thanks!
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Old 8th May 2020, 10:25 AM   #932
alexcp is offline alexcp  United States
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BPPBP - Bruno Putzey's Purist Balanced Preamp (well a balanced volume control really)
I use toroids where possible, but I see no reason why any other transformer would not do the job.
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Old 8th May 2020, 11:30 AM   #933
NATDBERG is offline NATDBERG  United Kingdom
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Quote:
Originally Posted by Hans Polak View Post
I'm frequently questioned concerning the IM23TS relay that I used for the volume control boards.
These relays were long time out of stock, but momentarily Farnell has a few thousands of them.

But in case using another relay, be aware that the PCF8574AT driver can only sink 80mA.
So with 6 relays, that's a max of 13mA per relay.
However the pin replaceable PCA8574AD can sink 200mA or 33mA per relay giving you more options for a relay selection.

Hans
They're still there, 700 left..

https://uk.farnell.com/te-connectivi...vdc/dp/1629004

Have they always been £3 each?
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Old 8th May 2020, 11:41 AM   #934
NATDBERG is offline NATDBERG  United Kingdom
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Quote:
Originally Posted by noviygera View Post
What would be the proper way of connecting RCA jacks to the inputs, since my sources are all unbalanced at this point?
Alternatively, to fit with any other design, you can buy RCAs in XLR-style back panel fittings, e.g. :

Neutrik NF2D-B-0 RCA Panel Mount Jack w/Colored Isolation Washer Black

Then you connect it to the board as set out in Bruno's paper .
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Old 14th May 2020, 03:08 AM   #935
noviygera is offline noviygera  United States
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I've got a SilentSwitcher power supply that would work nicely to provide +/-15v dc to my BPPBP. Where's the best location to connect the dc power?
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Old 3rd June 2020, 10:19 AM   #936
Hans Polak is online now Hans Polak  Netherlands
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Location: Blaricum
I have five VolCB's and four 4 input boards available. PM me in case anybody need some.

Hans
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Old 3rd June 2020, 11:23 AM   #937
billshurv is online now billshurv  United Kingdom
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BPPBP - Bruno Putzey's Purist Balanced Preamp (well a balanced volume control really)
Hans: I'll email you later. I may need 3 vol PCBs
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Old 3rd June 2020, 09:18 PM   #938
Hans Polak is online now Hans Polak  Netherlands
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Originally Posted by billshurv View Post
Hans: I'll email you later. I may need 3 vol PCBs
Thatís o.k.
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Old 25th June 2020, 12:27 AM   #939
geoturbo is offline geoturbo
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Tried to spot a reply for this one but did not find any info, lit's a long shot I guess.. is anyone using a Meldano Muses volume controller as volume pot for this Bppbp?
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Old 25th June 2020, 08:39 AM   #940
misterdog is offline misterdog  United Kingdom
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Good question, maybe try on the Muses thread also. I see Meldano has a new GB starting.

Muses Volume

Remote control and display would be cool.

Click the image to open in full size.

Last edited by misterdog; 25th June 2020 at 08:42 AM.
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