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AD 846 replacement
AD 846 replacement
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Old 27th February 2008, 03:43 PM   #1
Fasen is offline Fasen  Denmark
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Question AD 846 replacement

Hi there.

Have an old D/A kit (AIDA from the danish magazine High-fidelity) i want to bring back from the dead.
It uses 2 pcs of ad846 which i sold a long time ago. This opamp is no longer made, so which can i use instead directly without any mods?? any advise would be appriciated, thanks

Or should anyone have 2 they no longer need, id be happy to buy them.

/Per
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Old 27th February 2008, 05:00 PM   #2
avr300 is offline avr300  Denmark
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According to Analog this is a direct replacement:

http://www.analog.com/en/prod/0,2877,AD846,00.html

http://www.analog.com/en/prod/0,2877,AD811,00.html
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Old 27th February 2008, 05:09 PM   #3
jackinnj is offline jackinnj  United States
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AD 846 replacement
if you have a little patience, LME49713's are trickling out of National Semiconductor at a snail's pace. This is a CFB opamp designed specifically for audio.
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Old 27th February 2008, 05:27 PM   #4
avr300 is offline avr300  Denmark
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I did forget about that - and I'm using it in my preamp
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Old 27th February 2008, 05:44 PM   #5
Fasen is offline Fasen  Denmark
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great , thx guys
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Old 27th February 2008, 06:08 PM   #6
jackinnj is offline jackinnj  United States
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AD 846 replacement
I found some of the LME49713 -- they are SOIC so you will need an adapter if replacing a DIP. PM me if you care.
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Old 28th February 2008, 06:04 AM   #7
Fasen is offline Fasen  Denmark
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ok, thx.

Will try some LME49713 from jackinnj first. Ill get back to you if i need them.
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Old 4th March 2008, 09:50 AM   #8
Tolu is offline Tolu  Germany
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Default LME49713

Has anyone experience with this opamp? How does it sound?

I'm looking for an alternative in my preamp for second stage to replace my LM4652 which isn't so bad!

The 49713 needs a low input impedance about 2k so ordinary 10k log pots won't work!?

Regards

Thomas
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Old 4th March 2008, 12:16 PM   #9
jackinnj is offline jackinnj  United States
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AD 846 replacement
The non-inverting input impedance is 1.2 meg Ohms -- inverting is 50 -- you have to be very selective in choice of the feedback and gain resistors, The device will drive a 150 ohm load.

Remember that this is an SMT device.
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Old 4th March 2008, 12:33 PM   #10
jan.didden is offline jan.didden  Europe
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Default Re: LME49713

Quote:
Originally posted by Tolu
Has anyone experience with this opamp? How does it sound?

I'm looking for an alternative in my preamp for second stage to replace my LM4652 which isn't so bad!

The 49713 needs a low input impedance about 2k so ordinary 10k log pots won't work!?

Regards

Thomas

... and the max impedance seen from a 10k pot wiper is 2.5k, so not that bad anyway.

Jan Didden
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