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Composite TPA6120 with servo HPA
Composite TPA6120 with servo HPA
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Old 18th September 2018, 09:02 AM   #1
DontHertzMe is offline DontHertzMe  South Africa
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Composite TPA6120 with servo HPA
Default Composite TPA6120 with servo HPA

I've just finished my own design of a composite TPA6210 headphone amplifier helped along by a DC servo with a startup delay relay. The servo is probably not needed, as there is minimal DC with it left out of the loop.

All parts are through-hole for my shaky hands, with the exception of the TPA6120 itself. I needed some help getting that on the board, but I imagine it would be straightforward for anyone with non-shaky digits

TPA6120 HPA small.jpg

Distortion is a very respectable 0.0003% at 1V peak-to-peak and 0.00038% at 1Vrms.

TPA6120 1V p2p.pngTPA6120 1Vrms.pngTPA6120 FR.png

I'll post the schematic if anyone is keen.
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Old 19th September 2018, 02:16 PM   #2
auriga2001in is offline auriga2001in  India
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Interested in the schematic, as I got a couple of the TPA6210 chips.
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Old 19th September 2018, 03:49 PM   #3
Dibya is offline Dibya
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Amp looks cute
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Old 19th September 2018, 11:11 PM   #4
xrk971 is online now xrk971  United States
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Composite TPA6120 with servo HPA
Nice work DHM! What happened to the B in your name?!!!

I am surprised it needed a servo? What was offset without the servo?

What is the other opamp for?

On TSOP packages, just apply a moderate blob of solder along the pins and with flux, they will wick up along the pins and pads, just run the iron back and forth along the pins like you are playing a washboard. Use solder wick dipped in flux if you have too much and cleans up nicely. No precision soldering needed.
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Last edited by xrk971; 19th September 2018 at 11:15 PM.
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Old 20th September 2018, 10:01 PM   #5
DontHertzMe is offline DontHertzMe  South Africa
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Composite TPA6120 with servo HPA
Quote:
Originally Posted by xrk971 View Post
Nice work DHM! What happened to the B in your name?!!!
It went the way of the dodo . It was bugging me.

Quote:
Originally Posted by xrk971 View Post
I am surprised it needed a servo? What was offset without the servo?
The servo is not really needed. Without it in place the offset is <5mV. But the amp is DC coupled front to back so hopefully any minor source DC will be handled.

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Originally Posted by xrk971 View Post
What is the other opamp for?
Have a look at the schematic below

TPA6120.png
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Old 5th December 2019, 05:24 AM   #6
stanislav1957 is offline stanislav1957  Russian Federation
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Made the composite differently
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