Author Topic: TI OPA1612a on DIP8 adapters  (Read 269 times)

Offline fredeb

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TI OPA1612a on DIP8 adapters
« on: December 23, 2016, 10:26:08 AM »
Price : R120 each or R600 for all 6 ( not negotiable )
Location : Somerset West
Condition : They work perfectly ( unused , still have another 6 for myself )
Shipping : Yes , you pay .

These are of the best opamps of many I've tried to date ( these and 2x LME49990 on DIP8 ) . I use them in my Asus Xonar Essence STX in the I/V section ( LM6172 in the buffer ) . I use them in a phonostage that build , and I intend using the others I'm keeping for DACs and Headphone amps . I've tried many different opamps in the STX and phonostage , and these are REALLY good .

http://www.ti.com/lit/ds/symlink/opa1612.pdf

Ultralow Noise: 1.1 nV/√Hz at 1 kHz
Ultralow Distortion:
0.000015% at 1 kHz
High Slew Rate: 27 V/μs
Wide Bandwidth: 40 MHz (G = +1)
High Open-Loop Gain: 130 dB
Unity Gain Stable
Low Quiescent Current:
3.6 mA per Channel
Rail-to-Rail Output
Wide Supply Range: ±2.25 V to ±18 V

“And those who were seen dancing were thought to be insane by those who could not hear the music.”
― Friedrich Nietzsche

Offline DeonC

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Re: TI OPA1612a on DIP8 adapters
« Reply #1 on: December 23, 2016, 11:03:40 AM »
I will take 2, please. PM incoming.

Thanks,
Deon
« Last Edit: December 23, 2016, 11:05:43 AM by DeonC »
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Offline fredeb

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Re: TI OPA1612a on DIP8 adapters
« Reply #2 on: December 23, 2016, 12:48:47 PM »
I will take 2, please. PM incoming.

Thanks,
Deon

2 of these beauties sold to DeonC , if someone still wants the 6 package , I probably can be persuaded to part with 1 or 2 more .
“And those who were seen dancing were thought to be insane by those who could not hear the music.”
― Friedrich Nietzsche

Offline pwatts

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Re: TI OPA1612a on DIP8 adapters
« Reply #3 on: December 25, 2016, 12:35:35 PM »
OA1612 is a magnificent opamp, when used in the correct application. It lacks a bit of drive strength and is not suitable for output buffers, but for driving moderate loads such as filters and input buffers they are sublime. Haven't tried them for I/V though (going with OPA827 as a next experiment).

Interesting choice using LM6172 for output buffer with its large output current, the massive BW & slew rate can be troublesome with some implementations and can oscillate for breadboards or adapters. LM4562 is a great alternative at similar cost but more reasonable parameters and should work similarly unless driving really low impedance loads.

Offline DeonC

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Re: TI OPA1612a on DIP8 adapters
« Reply #4 on: December 25, 2016, 01:21:34 PM »
I want to use mine in this application:

Project 6 - Hi-Fi Phono Preamp (RIAA Equalisation)



I also have one of these, and was thinking of getting another pair:

Project 88 -  High Quality Audio Preamp (Mk II)

Thing is, I already have a good pre (NuPrime DAC-9), so I don't need another. I might just build it up to sell it.

« Last Edit: December 25, 2016, 01:31:10 PM by DeonC »
Life is not measured by the breaths you take, but by the moments that take your breath away.

Offline fredeb

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Re: TI OPA1612a on DIP8 adapters
« Reply #5 on: December 30, 2016, 08:55:38 AM »
Thanks for providing schematics and links Deon , very interesting . Do you make your own board or order from ESP ?

I've just received this DAC :



Replacing stock JRC5532DD with OPA1612 makes huge , and immediately noticeable difference for the better , night and day .

Other opamps I tried in the DAC ( 6.4VDC measured directly on pins ) :

OPA2134 : Sweet , warm sounding - can live with this one .
OPA2888 : Doesn't work , too much gain - distorts
OPA2111 : OK
LME49720 : Not particularly good in this application
2x LM49990 : OK , but OPA1612 still notably better
LM6172 : 2nd to OPA1612 , better than all others
OPA2137 : Distorts in this application
« Last Edit: December 30, 2016, 09:05:50 AM by fredeb »
“And those who were seen dancing were thought to be insane by those who could not hear the music.”
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Offline DeonC

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Re: TI OPA1612a on DIP8 adapters
« Reply #6 on: December 30, 2016, 10:01:07 PM »
Thanks for providing schematics and links Deon , very interesting . Do you make your own board or order from ESP ?

Actually, I got them here:

ESP Pre, Phono, PSU

As you can see, they were fully built up, just needing the op-amps.

Life is not measured by the breaths you take, but by the moments that take your breath away.

Offline fredeb

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Re: TI OPA1612a on DIP8 adapters
« Reply #7 on: December 30, 2016, 10:04:26 PM »
Actually, I got them here:

ESP Pre, Phono, PSU

As you can see, they were fully built up, just needing the op-amps.

Have you had time to start them up yet ? I guess I should first ask whether you received the opamps already ?
“And those who were seen dancing were thought to be insane by those who could not hear the music.”
― Friedrich Nietzsche