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Old 19th December 2012, 05:50 PM   #521
RNMarsh is offline RNMarsh  United States
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I went the hardware route so it could be stand-alone. Would not have to use a computer to get it working. But, thats an individual preference and cost issue.

I got a new THD instrument here and learned the second harmonic (H2) is really about the only harmonic to increase as load Z goes down to 30 Ohms. The other harmonics are so far down it doesnt matter. In other words, the effect is benign.

BTW - if this was used as a line amp, instead, - driving high Z load like the input of power amp or what ever - the HTD+N is around .00025%.... H2 is .00015% of that total.
Thx-RNMarsh

Last edited by RNMarsh; 19th December 2012 at 05:52 PM.
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Old 26th December 2012, 05:11 AM   #522
sonidos is offline sonidos  United States
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Quote:
Originally Posted by RNMarsh View Post
I went the hardware route so it could be stand-alone. Would not have to use a computer to get it working. But, thats an individual preference and cost issue.

I got a new THD instrument here and learned the second harmonic (H2) is really about the only harmonic to increase as load Z goes down to 30 Ohms. The other harmonics are so far down it doesnt matter. In other words, the effect is benign.

BTW - if this was used as a line amp, instead, - driving high Z load like the input of power amp or what ever - the HTD+N is around .00025%.... H2 is .00015% of that total.
Thx-RNMarsh
True on individual taste but I would prefer a hardware solution over having to buy and debug software.

Nice to throw in the specs when using it as a pre-amp. I am tempted to use it as a pre-amp as well!

For some of us amateurs, we sometimes miss the little details. I see the regs that I bought (LT1963a) only like to run up to 20V max at the input. I am so used to just snapping up 18V secondary transformers that I missed that little bit of info. I should have picked something a bit lower on the secondary voltage.
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Old 26th December 2012, 01:30 PM   #523
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Quote:
Originally Posted by sonidos View Post
For some of us amateurs, we sometimes miss the little details. I see the regs that I bought (LT1963a) only like to run up to 20V max at the input. I am so used to just snapping up 18V secondary transformers that I missed that little bit of info. I should have picked something a bit lower on the secondary voltage.
You can use an LM317 or LM7815/MC7815 ahead of the LT1963A.
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Old 26th December 2012, 04:10 PM   #524
sonidos is offline sonidos  United States
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Thanks for the support! I got 317's everywhere.

Last edited by sonidos; 26th December 2012 at 04:11 PM. Reason: remove quote
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Old 27th December 2012, 06:50 PM   #525
sonidos is offline sonidos  United States
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Default question about heat from the regulators

jackinnj -

We know that the output transistors need to have heatsinking. How about the LT regs you mentioned? How much heat did they give off? I bought the dpak smt versions off ebay for a great price. I want to just 'dead bug' them on a proto board but how hot do they get with the head amp?
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Old 1st January 2013, 08:25 PM   #526
lm1no2 is offline lm1no2  Norway
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Hi
Where can I buy PCB, on LinearAudio web page I can't find it.
Thanks
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Old 2nd January 2013, 02:24 AM   #527
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Default both of which I have showed here on this forum

Quote:
Originally Posted by homemodder View Post
Hmmm, this is just a combination of two well known circuits, both of which I have showed here on this forum. The input is the buffer as shown by JLH, the second part is as I described in Mpp thread to tweak JLHs headphone amp. Does this designer frequent DIY audio ??

Anyway it will sound and measure very well indeed.

Could you provide the link?
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Old 3rd January 2013, 06:26 AM   #528
RNMarsh is offline RNMarsh  United States
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here is the original JLH headphone amp circuit --- RNMarsh

??
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File Type: gif 12031719551981.gif (9.4 KB, 474 views)
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Old 3rd January 2013, 06:59 AM   #529
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Thank you for the original !
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Old 3rd January 2013, 08:38 AM   #530
gk7 is offline gk7
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another one from JLH:
http://www.angelfire.com/sd/paulkemble/jlhhdphaud.gif
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