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Old 10th January 2013, 11:43 PM   #11
diyAudio Member
Join Date: Feb 2009
this one can be a nice little brout for sub/ low end. or even full range. all doh i prefer a class A or 3 for my fullrange is anyone up for a PCB layout? "hint hint" alex

and i have to send a big thank you to Nelson. who gives us all this wonderfull schematics and curcuits where would we be without you?
and ofcourse, a extra thank you for all the support and inspiration you give us

Last edited by AudioSan; 10th January 2013 at 11:47 PM.
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Old 10th January 2013, 11:48 PM   #12
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Join Date: Dec 2011
Thanks NP.

First glance unedited comment: "that's hard to look at.."

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Old 11th January 2013, 12:07 AM   #13
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Input ground: C8- R2- R35 node?
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Old 11th January 2013, 12:36 AM   #14
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Location: MN
2nd, C9 is shown as 0pf??
3rd It almost looks like you could lift the input to C8 for a balanced input??
It's not about what you can BUY...It's about what you can BUILD!
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Old 11th January 2013, 12:52 AM   #15
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The more you stare at it the cooler it gets.

Thanks NP!
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Old 11th January 2013, 12:55 AM   #16
TJ is offline TJ
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Location: UK
beed waiting sooooooooooooooo long class AB from u !!! thank you TT
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Old 11th January 2013, 01:04 AM   #17
Mr. dB is offline Mr. dB  United States
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Location: Arkansas
Originally Posted by Nelson Pass View Post

Let It Not Be Said: That I never did anything for you....

I hope no one has ever said that.
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Old 11th January 2013, 01:08 AM   #18
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Originally Posted by Mr. dB View Post
I hope no one has ever said that.
+1. nelson have done more for us DIY nuts then any other have ever done
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Old 11th January 2013, 01:25 AM   #19
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A few quick answers.

The original design (this one) was intended for dummies with maximum
reliability and minimum adjustment and also minimum opportunity for
noises and pops. The customer wanted to put a pot and switch on the
input and use it as an integrated.

The 1n4004 (or any diode) is for current limiting - they will not get burned
out with the little current available from the front end.

The bias transistor for the output stage is best mounted where the heat is.

You will note that 1 ohm resistors for bipolar outputs is rather high. Values
on the order of 0.22 would be more appropriate (see Self) but we do get
higher reliability with 1 ohm values.

The 0 pf is provided for when oscillation occurs. I didn't see it in the sample

Also note that resistors are XXX plus multiplier: 1001 is 1K.

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Old 11th January 2013, 01:35 AM   #20
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aha. so 4001 will be good.
regarding the 1ohm's. maybe meet at the middle and use 0.47ohm?
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