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Old 1st March 2012, 08:38 PM   #31
zdr is offline zdr  Belgium
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Cool amp! Do you have eagle lme49600 footprints you could share please?
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Old 1st March 2012, 08:42 PM   #32
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Cool amp! Do you have eagle lme49600 footprints you could share please?
No, I'm sorry I do not. I ordered the boards from Jim's Audio:
eBay - New & used electronics, cars, apparel, collectibles, sporting goods & more at low prices

they are gold plated. Seem nice to me.
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Old 31st March 2012, 01:38 PM   #33
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Cool amp! Do you have eagle lme49600 footprints you could share please?
If you use EAGLE you should try to learn how to do a footprint by yourself because this is basic knowledge when you are using a pcb cad software.
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Old 31st March 2012, 01:53 PM   #34
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If you use EAGLE you should try to learn how to do a footprint by yourself because this is basic knowledge when you are using a pcb cad software.
I don't use Eagle, but there are PCB layouts in this document:
http://www.ti.com/lit/an/snaa052/snaa052.pdf
It's the manual for the LME49600 evaluation board.
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Old 31st March 2012, 02:47 PM   #35
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TI/National has used Altium Designer I think.
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Old 1st April 2012, 10:25 PM   #36
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I've found that when using standard digital sources, that you don't really need any gain at all in a headphone preamp and this is with HD650s and HD555s, so with a relatively low and then high impedance pair of cans. Both can blow my brains out with the gain set to unity. I am not surprised that you found you needed to reduce the gain.
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Old 3rd April 2012, 10:11 AM   #37
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I've found that when using standard digital sources, that you don't really need any gain at all in a headphone preamp and this is with HD650s and HD555s, so with a relatively low and then high impedance pair of cans. Both can blow my brains out with the gain set to unity. I am not surprised that you found you needed to reduce the gain.
Thanks. I have a solution for my particular case. I can replace the 1:1 input transformers with 4:1 step down. It's a shame to throw away voltage, but I see no other good choice in my case.
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Old 20th November 2013, 01:45 PM   #38
miklos is offline miklos  Canada
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I didn't see the need for the 100k resistor.
I think the 100K is there for safety , if the input goes open for any reason, the output of the LME49600 goes to the rail and then you would need the protection. This is for the original Ti design.
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