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Old 25th November 2003, 07:34 PM   #1
Electrons are yellow and more is better!
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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
Electrons are yellow and more is better!
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Pcb with groundplane. The size is 1.875 x 3.000"
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Old 25th November 2003, 10:56 PM   #3
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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
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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
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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
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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
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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
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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
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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
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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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