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Old 31st October 2016, 09:59 PM   #11
flashgo is offline flashgo  United States
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Quote:
Originally Posted by tfboy View Post
Added tentative pricing.
Can those of us outside the UK avoid the VAT?
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Old 1st November 2016, 05:16 AM   #12
aradan is offline aradan  Singapore
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Yes, it happened before
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Old 1st November 2016, 05:46 AM   #13
tnargs is offline tnargs  Australia
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Originally Posted by tfboy View Post
1 board.
Each board is stereo. And you have two pairs of switchable inputs. All are Neutrik balanced XLR sockets.
Each board can take one set / pair of regulators. You don't need the Hypex ones, you can use regular regs if you want.
Thanks. I am trying to skim the articles and prior threads to find out how much gain does it have, if any?
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Old 2nd November 2016, 01:17 AM   #14
tnargs is offline tnargs  Australia
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Originally Posted by tnargs View Post
Thanks. I am trying to skim the articles and prior threads to find out how much gain does it have, if any?
Also, what are the maximum input signal and output signal?
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Old 2nd November 2016, 11:33 AM   #15
tfboy is offline tfboy  United Kingdom
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Quote:
Originally Posted by flashgo View Post
Can those of us outside the UK avoid the VAT?
Yes, see first post amended with additional details.
Quote:
Originally Posted by tnargs View Post
Thanks. I am trying to skim the articles and prior threads to find out how much gain does it have, if any?
Unity gain. See original thread here discussing technical points
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Old 2nd November 2016, 12:01 PM   #16
AndrewT is offline AndrewT  Scotland
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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.
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Old 2nd November 2016, 12:32 PM   #17
tfboy is offline tfboy  United Kingdom
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Oops. Thanks Andrew for detailing the reality. Long day yesterday at work...
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Old 2nd November 2016, 02:50 PM   #18
aradan is offline aradan  Singapore
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I think voicb project led by Hans was aimed to address the volume control for bpbp. Together with maya controller or any ither diy controller it can make a good r2r gain controller

See the discussion here

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Old 3rd November 2016, 07:42 AM   #19
Gerben is offline Gerben  Netherlands
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Quote:
Originally Posted by AndrewT View Post
It's not unity gain.
I changed to a stepped vol pot, to set the attenuations of the inverting opamp stage. Much better.
Hi Andrew T,

Can you explain your solution? I have concerns about the consquences if the wiper of the pot fails. The maya solution is really neat but is overkill for what I'm looking for: just a replacement for the pot

I dont get the stepped volume pot. From other threads i read the suggestion for a 5Kpot +5K resistor, is this the change? Or did you use a stepped ladder switch and if so do you have suggestions for values using a 23 step switch like eg. this:
http://www.analogmetric.com/goods.php?id=1000

Thanks!

Gerben

Last edited by Gerben; 3rd November 2016 at 07:45 AM. Reason: Link not right
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Old 3rd November 2016, 09:31 AM   #20
AndrewT is offline AndrewT  Scotland
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I gave a few details, but not the resistor values.
I copied the ideas from the main thread.
I'll post more info over there.
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