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Old 3rd November 2016, 10:47 PM   #21
Gerben is offline Gerben  Netherlands
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Join Date: May 2004
Location: Deventer
Ok, looking forward.

Apologies BTW for asking the techy questions in this thread!
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Old 4th November 2016, 06:21 AM   #22
tnargs is offline tnargs  Australia
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Join Date: Sep 2006
Quote:
Originally Posted by AndrewT View Post
It's not unity gain.

The gain is set by the vol pot.
The residual resistances at the vol pot extremes effectively sets the limits of the attenuation and gain.
Typically expect >>+40dB of gain at the top end and <-50dB of attenuation at the bottom end.
But the steepness of the rate of change towards the ends of the vol pot track make the last ten to twenty degrees of rotation nearly useless. Expect only the middle 200degrees of rotation be be an effective control and half of that will be gain (i.e. >+0dB)
I found all my range of volume adjustment was squeezed into less than 90 degrees of rotation. I changed to a stepped vol pot, to set the attenuations of the inverting opamp stage. Much better.
Thank you, this is important to me. Unity gain would not really serve me well.

And, I assume the tech discussion is moving to "the main thread", meaning the one linked in the second line of the top post of this thread. cheers

Last edited by tnargs; 4th November 2016 at 06:35 AM. Reason: found the tech discussion thread
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Old 4th November 2016, 12:04 PM   #23
805amp is offline 805amp  United Kingdom
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Location: Little Sutton Ellesmere Port
Default Bruno Putzeys Balanced Preamp

Thank you! I signed up for 1 assembled board + 1 reg set
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Old 4th November 2016, 03:04 PM   #24
fusion5 is offline fusion5  Germany
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Join Date: Jun 2016
One assembled board and one set of regs.

Thank you!
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Old 7th November 2016, 08:35 PM   #25
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Join Date: Jul 2012
Hi,

1 assembled board + 1 reg set
please

Thanks
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Old 10th November 2016, 10:38 AM   #26
tfboy is offline tfboy  United Kingdom
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Join Date: Feb 2006
Location: Reading, Berkshire
Coming along nicely
It would be great if we could get near 100 assembled PCBs in order to get the better pricing, but if we struggly much past 50, I might leave it there...
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Old 10th November 2016, 11:11 AM   #27
tnargs is offline tnargs  Australia
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Thanks. I was wondering what target we are looking to reach. No rush from my end. cheers
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Old 20th November 2016, 04:03 PM   #28
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Quote:
Originally Posted by tnargs View Post
Thanks. I was wondering what target we are looking to reach. No rush from my end. cheers
What's the target or when this GB will be running?
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Old 21st November 2016, 12:09 AM   #29
tfboy is offline tfboy  United Kingdom
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Join Date: Feb 2006
Location: Reading, Berkshire
Quote:
Originally Posted by mrfloyd2000 View Post
What's the target or when this GB will be running?
Ideally, I'd like to reach 100. If not, we will settle with 50.
It's a large up-front cost to me to get them made so don't want to order a load, pay for them and then be stuck with them.

We're at 30+ boards at the moment. Another 15-20 to get the ball rolling.
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Old 21st November 2016, 03:22 AM   #30
tnargs is offline tnargs  Australia
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Makes sense to me, thanks.
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