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alazira
diyAudio Member

Join Date: Jun 2007
Location: Las Vegas
Quote:
 Originally Posted by AndrewT no. the gain is set by the ratio of those resistors. Changing both, as you have shown, leaves the ratio exactly the same, i.e. the gain is the same.

Quote:
 Originally Posted by Nelson Pass Alternatively, you can increase the value of the Source resistors to 1 ohms, and increase the value of the feedback resistors from 2 X 100 ohms and 10 ohms to 1 X 100 ohms and 22 ohms. The lower amount of feedback will warm the sound up, and you can keep increasing proportional values in the feedback loop if you wish.
Thanks Andrew,

I didn't realize that the feedback:source proportion sets the gain.

So is there any problem reducing the source resistor value to increase gain without warming up the sound?

Peter Daniel
diyAudio Member

Join Date: Jul 2002
Quote:
 Originally Posted by necplusultra is it possible to convert the pd f5 stereo boards to mono balanced and if so, how?
Same as it was done with F4 (page 7 of manual): http://firstwatt.com/pdf/prod_f4_man.pdf
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“Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC

 25th April 2012, 03:14 PM #703 necplusultra   diyAudio Member   Join Date: Jan 2011 Location: sitting down Thanks Peter. plus/minus from balance input goes to left/right input of F5. I presume ground goes to star ground. Is there any other connection needed between the 2 boards?
 25th April 2012, 06:23 PM #704 dimkasta   diyAudio Member     Join Date: May 2010 Location: Athens Hello again Peter. I think it was asked again. Do you have any plans on making any Turbo v3 pcbs?
 26th April 2012, 11:36 AM #705 necplusultra   diyAudio Member   Join Date: Jan 2011 Location: sitting down greetings, read the F4 manual again still looking for answer to the balance mono connections: + output from balance goes to F5 + left - output from balance goes to F5 + right ground from balance input goes to ??? Does the ground of the balance input go to the star ground or is it left floating?
Peter Daniel
diyAudio Member

Join Date: Jul 2002
Quote:
 Originally Posted by necplusultra greetings, read the F4 manual again still looking for answer to the balance mono connections: + output from balance goes to F5 + left - output from balance goes to F5 + right ground from balance input goes to ??? Does the ground of the balance input go to the star ground or is it left floating?
The manual is very clear about it:

Pin 1 of the XLR connector is ground
Pin 2 is positive.
Pin 3 is negative.

So the ground of the balance input go to the star ground.
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www.audiosector.com
“Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC

Peter Daniel
diyAudio Member

Join Date: Jul 2002
Quote:
 Originally Posted by dimkasta Hello again Peter. I think it was asked again. Do you have any plans on making any Turbo v3 pcbs?
I started working on it in Feb, but somehow didn't feel motivated enough to finish seeing the other group buy. Now when I see how slowly it develops, I might as well finish what I started
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www.audiosector.com
“Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC

 28th April 2012, 06:17 AM #708 sangram   diyAudio Member   Join Date: Sep 2002 Location: India ^^Please do. Waiting with bated breath.
 26th June 2012, 03:22 PM #709 cmsajith   diyAudio Member   Join Date: Jan 2008 Peter, Any update on the Turbo boards?
 30th July 2012, 03:19 PM #710 huguesb diyAudio Member   Join Date: May 2012 Sent you the money!

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