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Current feedback high speed headphone amp with diamond output buffer
Current feedback high speed headphone amp with diamond output buffer
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Old 25th November 2003, 07:34 PM   #1
peranders is offline peranders  Sweden
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Current feedback high speed headphone amp with diamond output buffer
Default Current feedback high speed headphone amp with diamond output buffer

Current feedback high speed headphone amplifier with diamond output buffer...

This is my first real attemt to build an amp which I have simulated first.

DC - 20 MHz but less I suppose. All SMD!
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Old 25th November 2003, 07:38 PM   #2
peranders is offline peranders  Sweden
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Current feedback high speed headphone amp with diamond output buffer
Pcb with groundplane. The size is 1.875 x 3.000"
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Old 25th November 2003, 10:56 PM   #3
Upupa Epops is offline Upupa Epops  Czech Republic
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Realy nice work Per, but I have question : have you any phones with similar wide frequency ? Was your grandfather dolphin and your father bat ? Have you " sonar " ears ? Will be sound produced by this amp pleasant for guys which have " glass cathode head " ?
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Old 26th November 2003, 06:16 AM   #4
Jan Dupont is offline Jan Dupont  Denmark
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Default Peranders

I'm also interested in knowing why you let it go all the way up to 20 MHz???
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Old 26th November 2003, 10:44 AM   #5
PMA is offline PMA  Europe
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Current feedback high speed headphone amp with diamond output buffer
Regarding frequency range - less is sometimes more. DC - 100kHz might give better sonic results than DC - 20 MHz, once you'll see and hear , as you do not need to listen to RF intermodulation products.

But for short wave transmitter, DC - 20 MHz will definitely give better result
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Old 26th November 2003, 11:02 AM   #6
Fred Dieckmann is offline Fred Dieckmann  United States
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Default kilometers Per hour

Here's some Gain Bandwith products for some of the most popular op amps among
the DIY builders:

OPA627 16MHz

OPA604 20MHz

AD8610 25MHz

AD825 41MHz

OPA627 >50MHz

I think Per is probably in the neighborhood of a reasonable bandwidth. It sounds like a good idea to me.........
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Old 26th November 2003, 08:22 PM   #7
peranders is offline peranders  Sweden
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Default Re: kilometers Per hour

Quote:
Originally posted by Fred Dieckmann
I think Per is probably in the neighborhood of a reasonable bandwidth. It sounds like a good idea to me.........
What?

If you (not Fred) check the shematics you have a "speed adjuster" so you can tune in the speed you like but the main purpose is to get a stable amp.

Don't forget that we have a bunch of guys here which like current feedback opamps with speed of > 100 MHz => GHz transistors.
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Old 26th November 2003, 08:28 PM   #8
Jan Dupont is offline Jan Dupont  Denmark
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Default Peranders

This is serious!
Please explain to me the advantages of having audio gear that are able to reproduce 20MGHz and up.....
The harmonics are "long gone" at that frequency!!!!!
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Old 26th November 2003, 08:32 PM   #9
Upupa Epops is offline Upupa Epops  Czech Republic
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Default Speed

Per, you have certainly true - ultra fast stabil amp will have low distortion on high frequecys and it is right, but read again words of PMA - ultrawide frequency band is not in some cases the best solution.
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Old 26th November 2003, 08:45 PM   #10
peranders is offline peranders  Sweden
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Current feedback high speed headphone amp with diamond output buffer
Default Re: Speed

Quote:
Originally posted by Upupa Epops
...ultrawide frequency band is not in some cases the best solution.
Maybe so, but I (or anyone else) can adjust that. Faster isn't automaticly better but building the prototype will give us the answers but I have a hunch about linearity and high speed. Normally this is positive.

Pcb's are ordered in case any wonders...
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Old 26th November 2003, 08:47 PM   #11
Bricolo is offline Bricolo  France
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Default Re: kilometers Per hour

Quote:
Originally posted by Fred Dieckmann
Here's some Gain Bandwith products for some of the most popular op amps among
the DIY builders:

OPA627 16MHz

OPA604 20MHz

AD8610 25MHz

AD825 41MHz

OPA627 >50MHz

I think Per is probably in the neighborhood of a reasonable bandwidth. It sounds like a good idea to me.........
Fred, there's 2 OPA627. The 16MHz one is correct, but the other... maybe an OPA637?
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Old 26th November 2003, 08:51 PM   #12
peranders is offline peranders  Sweden
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Current feedback high speed headphone amp with diamond output buffer
Default Re: Peranders

Quote:
Originally posted by ACD
This is serious!
Please explain to me the advantages of having audio gear that are able to reproduce 20MGHz and up.....
The harmonics are "long gone" at that frequency!!!!!
Sorry, Jan, I can't. First of all it's a thrill technically to scream out 20 MHz with gain from plain BC-transistors.

Hugh (and his many customers) on the other hand thinks that his rather slow AKSA amp is sounding good so there you have the opposites. I will come back later and tell you if 20 megagigaherts(!) is good or bad soundwise.
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Old 26th November 2003, 08:55 PM   #13
Jan Dupont is offline Jan Dupont  Denmark
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Default Peranders

Thanks for your reply....
I was worried that you have gone "fanatic"
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Old 26th November 2003, 08:55 PM   #14
PMA is offline PMA  Europe
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Current feedback high speed headphone amp with diamond output buffer
Default Re: Re: Speed

Quote:
Originally posted by peranders

Maybe so, but I (or anyone else) can adjust that. Faster isn't automaticly better but building the prototype will give us the answers but I have a hunch about linearity and high speed. Normally this is positive.

Pcb's are ordered in case any wonders...
Yes, inherently fast and stable is good, but impulse response unfortunatelly tells nothing about intermodulation with D/A HF residuals. We have compared "unlimited" buffer-preamp (about 6MHz/-3dB) with filtered version (about 140 kHz/-3dB) and the final judge was clear - everyone of 10 listeners preferred the bandwidth limited version. Cleaner, less agresive, non-harsh, more details, more natural sound.
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Old 26th November 2003, 09:21 PM   #15
Upupa Epops is offline Upupa Epops  Czech Republic
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Per, it is all about " fine tuning " of final product - I hope that you will inform us about this hearing experiences . Last arbiter is human ear, but it must be ears of guys, which have not " glass head " .
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