Can anybody suggest an opamp wich:
- is known to work well as gain amplifier at +/- 15V output voltage
(i.e. with declared parameters at high output voltage)
- may be used with +/-30V power supplier
- is widly tested subjectively (with ears and proved to be excellent
in aufio DIY-ing.
And I'll be happy if opamp's output stage works in Class A, are such opamps there?
Thanks in advanced!
Andrew
- is known to work well as gain amplifier at +/- 15V output voltage
(i.e. with declared parameters at high output voltage)
- may be used with +/-30V power supplier
- is widly tested subjectively (with ears and proved to be excellent
in aufio DIY-ing.
And I'll be happy if opamp's output stage works in Class A, are such opamps there?
Thanks in advanced!
Andrew
I tend to use OPA445 for higher voltages. I've always been very pleased with its performance. Works up to +/-45V rails.
I'm fairly sure there is no such thing as a class-A op-amp. I don't think there would be a big enough market for such a thing except amongst the most enthusiatic of enthusiasts.
I'm fairly sure there is no such thing as a class-A op-amp. I don't think there would be a big enough market for such a thing except amongst the most enthusiatic of enthusiasts.
I have not heared about Class A opamps too
OK, I have looked at OPA445 price in my region and it is not very sutable ($30).
If we eliminate +/-30V PS, and leave +/-12V output amplitude - will such
elimination give us more choices? It isn't difficult to supply needed PS,
but output amplitude is important at any case.
OK, I have looked at OPA445 price in my region and it is not very sutable ($30).
If we eliminate +/-30V PS, and leave +/-12V output amplitude - will such
elimination give us more choices? It isn't difficult to supply needed PS,
but output amplitude is important at any case.
$30? Ouch. It's only £5 (~$10) here.
Most op-amps can reach within ~3V of the supply rails, so to get +/-15V (assuming that was peak voltage you wanted) you could get away with +/-18V supplies, which would widen your choices a lot. Rail-to-rail op-amps could do it with only +/-15V supplies, and there are plenty of that sort of op-amp around, although they might not be the best for audio (I've never used any for audio).
Most op-amps can reach within ~3V of the supply rails, so to get +/-15V (assuming that was peak voltage you wanted) you could get away with +/-18V supplies, which would widen your choices a lot. Rail-to-rail op-amps could do it with only +/-15V supplies, and there are plenty of that sort of op-amp around, although they might not be the best for audio (I've never used any for audio).
Here is my gain stage & headamp,it is based on a dual LM6172 with solid class B (AB) driver.
LM6172 DATA SHEET
the transistor pairs that I used is B647/D667.
B647 DATA
some helpful discuss on headwize.
URL
inner pic attached,
LM6172 DATA SHEET
the transistor pairs that I used is B647/D667.
B647 DATA
some helpful discuss on headwize.
URL
inner pic attached,
Attachments
I think the OPA604 can be run of relatively high voltages (for an opamp), +/-24V if I do recall correctly. Admitedly this is absolute max, but I've been running at 2604 at +/-24V for a rather long time now and it's still going strong. Even the NE5532 can be run of higher than +/- 15V supplies.
It can be argued if the OPA604 is excellent for audio or not, but alot of people like it's sound.
Admitedly these are not +/-30V rail to rail opamps, but hopefully they're more usefull to you than the +/-15V that is ever so common.
It can be argued if the OPA604 is excellent for audio or not, but alot of people like it's sound.
Admitedly these are not +/-30V rail to rail opamps, but hopefully they're more usefull to you than the +/-15V that is ever so common.
anli said:Can anybody suggest an opamp wich:
- is known to work well as gain amplifier at +/- 15V output voltage
(i.e. with declared parameters at high output voltage)
- may be used with +/-30V power supplier
- is widly tested subjectively (with ears and proved to be excellent
in aufio DIY-ing.
And I'll be happy if opamp's output stage works in Class A, are such opamps there?
Thanks in advanced!
Andrew
Hi Andrew,
What is your circuit or application?
Re: Re: +/-15Vout opamp for gain stage
There isn't final design. I serach/investigate amplifiers with Class-A
output stage. At any case - with or without global NFB, some gain
stage (and balanced line driver) must exist, and I do no reject opamps
using in these stages, but do it for an output stage only So, opams as
gain_stage/balanced_driver pros and cons are interesting for me.
Elso Kwak said:
Hi Andrew,
What is your circuit or application?
There isn't final design. I serach/investigate amplifiers with Class-A
output stage. At any case - with or without global NFB, some gain
stage (and balanced line driver) must exist, and I do no reject opamps
using in these stages, but do it for an output stage only So, opams as
gain_stage/balanced_driver pros and cons are interesting for me.
JoeBob said:I think the OPA604 can be run ...
Thanks, I'll look at OPA604 .
Andrew
Re: OPA551
What about subjective audio impressions with this opamp?Elso Kwak said:OPA551 works on +/- 30V rails and has output voltage swing till 2V from rails.
Re: Re: OPA551
I am sorry I have none.anli said:What about subjective audio impressions with this opamp?
JoeBob said:It can be argued if the OPA604 is excellent for audio or not, but alot of people like it's sound.
Thanks, probably OPA604 is the most sutable for my current design
topology.
Were there some real complains against audio-using of OPA604?
I've used OPA604 a lot and never been disappointed. However, Douglas Self seems less than impressed.
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