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Old 25th March 2010, 09:32 AM   #1
Bonsai is offline Bonsai  Taiwan
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Default Have you seen this?

KS Projects - High End Headphone Amplifier Construction

Sorry, I am new to the headphone forum. I don't know if you guys have seen this. Might be of interest
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Old 25th March 2010, 03:43 PM   #2
00940 is offline 00940  Belgium
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Not a very interesting design.

If you go for an amplifier with opamp + buffer on a dual supply, what's the point in having coupling caps ? (and 47r on the ouput is excessive imo, but tastes could vary)
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Last edited by 00940; 25th March 2010 at 03:45 PM.
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Old 25th March 2010, 04:26 PM   #3
Gordy is offline Gordy  United Kingdom
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00940 you know that it is not 'top-end', but it does offer another schematic for the library of those new to investigating headphone amplifiers. It also demonstrates a nice clean enclosure and provides engineering drawings of the end plates as examples. Also, the construction photographs may be quite useful for those new to projects.

So not the ultimate, but may be helpful to some people.

Last edited by Gordy; 25th March 2010 at 04:28 PM.
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Old 25th March 2010, 10:18 PM   #4
00940 is offline 00940  Belgium
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Well, maybe I was a bit harsh. Still, it's a bit of a shame to use such expensive opamps, resistors and caps in a sub-optimal configuration.

I would at least do some simple mods: jumper the output caps (and caps in the feedback path, if my math is correct, DC offset should be under 5mV), reduce in value or jumper the resistor at the output.

I'm a bit puzzled by the use of the lm2940 when you're using a good old 7912 on the negative rail. I also don't see the point to burn 10ma just to bias the 1n4148 in the ccs.

The physical implementation is really nice though.
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Old 26th March 2010, 04:13 AM   #5
Gordy is offline Gordy  United Kingdom
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Quote:
Originally Posted by Bonsai View Post
If anyone is interested in this, then take a look at this one also: Headphone Amplifier
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