schematic
Here is the circuit.
I actually use a logarithmic attenuator (Joshua Tree) on input, but you could use just about any pot depending on what you use for RIZ. For 100K I would use 10-20K pot.
:EDIT:
Also note that for ROUT I have been using just a jumper. For a capacitive load I would use 10-220R. Try to go as low as possible.
Here is the circuit.
I actually use a logarithmic attenuator (Joshua Tree) on input, but you could use just about any pot depending on what you use for RIZ. For 100K I would use 10-20K pot.
:EDIT:
Also note that for ROUT I have been using just a jumper. For a capacitive load I would use 10-220R. Try to go as low as possible.
Attachments
To follow up on that when I listened to the 627 for ten minutes last weekend I only changed one amp, the other still had AD8620.
It did indeed have a bloated bass, on top of which the mids and highs were distant/recessed. Next to the AD this was screamingly apparent.
It did indeed have a bloated bass, on top of which the mids and highs were distant/recessed. Next to the AD this was screamingly apparent.
pinkmouse said:
Me too.
Though I'd actually prefer to see the graph that displays the cause for it... it may not be frequency response.
Seems like we're about to get into the "all op amps sound the same" discussion.
pinkmouse said:
Measurements don't show everything. I'm sure that the OPA627 is ruler flat like the LM4562.
Flat measured devices don't have the same sound. If it was the case, near all amplifiers should have the same sound.
Marc
Isn't this what Mr. Pease is going to be working on with these op amps?
Hopefully he dreams up a few things to look at that haven't been before. Group delay.... maybe settling time varies with load or frequency or hell I'm just going to leave it up to Bob that's what he gets paid for.
Hopefully he dreams up a few things to look at that haven't been before. Group delay.... maybe settling time varies with load or frequency or hell I'm just going to leave it up to Bob that's what he gets paid for.
Does it come in one opamp/IC also?
How does one get samples from national?I never succeded to get any.
How does one get samples from national?I never succeded to get any.
I had no problem at all. click on samples, go through the process of answering all manditory fields, make up a company name if you dont' have one, select design engineer, consumer products.. you can only get three samples max, so I got three in soic and 3 more in DIP. Both requests approved with 24 hours, they're on their way. Oh and when you're filling out the fields, don't use a hotmail type of account.
I think I read somewhere on the NS sites that this one and the quad op will be delivered later on. As far as I remember in the beginning of the next year
I interpreted the mails I got the way that they don't send any samples to Europe ("... please contact your local distributor...").
Regards
Floric
forr said:
Me too.
Anybody knows how to get it? Patents? Forr, if you find it share with me please.😉
LM4562 schematic
Its very unlikely that Nat Semi will publish the LM4562 schematic, as they would have put a lot of effort into its high performance design, and they wouldn't want to give away anything their competitors.
The full schematic of the LM1875 chip amp was published in the datasheet. I've asked for the schematic of LM3886, but they wouldn't go beyond a few minor clarifcations of the equivalent schematic in the datasheet. See my web page at http://home.pacific.net.au/~gnb/audio/lmcomp.html#schem for a few functional schematics of NS chip amps LM4780 / 3886 / 3875 / 1875.
darkfenriz said:
Its very unlikely that Nat Semi will publish the LM4562 schematic, as they would have put a lot of effort into its high performance design, and they wouldn't want to give away anything their competitors.
The full schematic of the LM1875 chip amp was published in the datasheet. I've asked for the schematic of LM3886, but they wouldn't go beyond a few minor clarifcations of the equivalent schematic in the datasheet. See my web page at http://home.pacific.net.au/~gnb/audio/lmcomp.html#schem for a few functional schematics of NS chip amps LM4780 / 3886 / 3875 / 1875.
classd4sure said:
That is generally referred to as fraud.
I dread the day someone does an ethics test overhere.
This is what I got:We regret that we are unable to fulfill the sample request as follows:
Part Number : LM4562NA for 3 pieces.
Allways the same.
Part Number : LM4562NA for 3 pieces.
Allways the same.
Just order them from the website, they will send them to
Europe (Germany) for free. No problem there 😀
Europe (Germany) for free. No problem there 😀
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