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Old 13th April 2015, 10:47 AM   #11
AndrewT is offline AndrewT  Scotland
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ne5534 is not unity gain stable
ne5532 (the dual version) is unity gain stable.
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Old 14th April 2015, 06:56 PM   #12
npn is offline npn  Germany
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Okay, but paralleling two opamps from such as NE5532 to have more current leads to oscilaling too. D.Self have written it.
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Old 14th April 2015, 07:10 PM   #13
udailey is offline udailey  United States
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Headphone Power Buffer
DSelf goes on for a whole chapter if not more on the virtues of paralleling the 5532 and 49710. His conclusion was the more the better. How about the power amp that uses over a dozen paralleled?
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Old 14th April 2015, 07:53 PM   #14
mlloyd1 is offline mlloyd1  United States
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NE5532 is unity gain stable; NE5534 is not.

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Old 27th May 2015, 02:37 AM   #15
Einric is offline Einric  United States
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Here is my current layout for the dual paralleled NJM4556 headphone buffer with it's power supply.
I was able to have a friend adjust the layout for use of a SIP8 package of the same opamp to gain an additional 200mW dissipation per channel.
AND Mouser has like 5000 of them in stock.
I may do a group buy for the PCB's if the prototype ends up working as planned.
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File Type: jpg Headphone Buffer SIP8.jpg (544.2 KB, 312 views)
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Old 27th May 2015, 04:20 PM   #16
davidsrsb is offline davidsrsb  Malaysia
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ADSL drivers like the THS6182 make excellent headphone drivers, while keeping current drain down lower than paralleling "audio" opamps
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Old 27th May 2015, 04:25 PM   #17
Einric is offline Einric  United States
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That chip is $9........
Ouch!
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Old 27th May 2015, 06:07 PM   #18
jcx is offline jcx  United States
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TPA6120A2DP is cheaper, slightly higher V

and its $5.44 in singles at Digikey

for DSL specs the TPA6120 is the same chip as the THS6012 but its popularity as the TPA6120 audio speced headphone/audio line driver lets us get the cheaper price

I've used the soic 20-wide powerPad package upside down with a cpu cooler clamped to its power pad to run at over 5W per chip


I don't understand the price objection - you would need a dozen 5532 to come close to the output current which is going to take up space, assy time for a objectively worse result given the ancient semi process used


these DSL pretty much need pcb, nice projects spend more on PS, case, pot than all semiconductors together

Last edited by jcx; 27th May 2015 at 06:14 PM.
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Old 27th May 2015, 06:20 PM   #19
Einric is offline Einric  United States
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I'm not running 5532's......I don't know why they were brought up previously......
I am running NJM4556's as a headphone buffer.
I also want everything to be through hole for ease of assembly to any skill level.
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Old 28th May 2015, 01:39 PM   #20
davidsrsb is offline davidsrsb  Malaysia
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The TPA6120A2DP looks good, the more audio focused specs look really good. That supply rejection is excellent, often a problem with opamps
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