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Old 22nd November 2020, 02:25 PM   #91
tvrgeek is offline tvrgeek  United States
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Join Date: Dec 2009
Location: North Carolinia/Piedmont
Looks like not much has changed. Nothing really new. Some cool new stuff for instrumentation and specifically made to feed a DAC chip, but for a generic drop in dual 8 pin DIP, the 4562 seems to be a fair bet. So, in 40 years, 741 to TLO72 to NE5532, to 4562. Probably reached the "good enough" range.

I did find this as something new. ( to me)
https://www.ti.com/lit/an/sboa356/sb...oogle.com%252F


OPA1656 looks nice, but smt. Not a drop in. Requires a header. I don't do well with smt.

I kind of have to chuckle at some of the expensive" comments. My new JDS tone control has a $.49 OP-Amp and it does not seem to add any sound of it's own. ( 49 cents, plus $11 shipping for one of course) We are talking about a chip that is better than a $1000 discrete buffer stage of years passed. 50 cents or 5 bucks, Cheap. Now I grant you, price is not an indictor if it is the best choice. Source impedance, inverted or not, rail voltage, ad nauseum specs.
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Old 23rd November 2020, 01:29 AM   #92
PaulBass is offline PaulBass  United States
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Join Date: Mar 2010
Quote:
Originally Posted by mgottwa View Post
My choice would be OPA1612 oder ADA4898-2.
OPA1612 is one of the greatest I ever heard. It was worth soldering to those adapters
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Old 23rd November 2020, 03:15 AM   #93
tvrgeek is offline tvrgeek  United States
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Join Date: Dec 2009
Location: North Carolinia/Piedmont
My XKitz crossovers have the 1654 quad in them. Can't measure the noise or distortion as it is well below my capability. They make no sound as far as I can tell, which is what an amplifier is supposed to do. Gives me a benchmark.

My tone control has a NJM4556AV, which is not that great on paper. Might be a worthwhile simple swap. I did get two little headphones boards to practice on. They have OPA2604s SOIC in them. I succeeded in soldering one pair, but have not tried removing and replacing.
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