"The Wire" Ultra-High Performance Headphone Amplifier - PCB's

[GLooP]

Thank you, qusp. I was asking because I have some quantities left of these.

[qusp]

no problem, you could conceivably do it if you used a socket and added the compensation, alternatively if you raised the gain to x4-5 it would work fine. its just i see these chips rolled into unsuitable circuits so often

half your luck having too many ad797, wanna sell some? i need some for regulators

[GLooP]

They are not that much. I just expect this part to be discontinued soon and decided to keep several pcs for black days. So far I'm most impressed by ADA4637-1BR but they are quite expensive. I'm yet to try LME49990 if it is really that good.

I've read almost the whole thread but I still have this in my head: what are the benefits of SMD vs through-hole, except size/reduced signal traces? Are differences within levels of perception?

[opc]

Hi Guys,

After agdr's question about the pot on the PSU I realized I hadn't posted updated schematics for quite a while.

I've attached a PDF which is the absolute final version of all kits, and this is exactly what will be shipped in each kit.

The schematic has information for each part embedded, so just click on the part you're interested in, and it will tell you everything you need to know about it.

I'll post updated BOM's later today.

Regards,
Owen

[Wolfsin]

OPC, you are the man! Setting new standards for everything! OK, how did you do that PDF?

[qusp]

I expect he just exported it from his PCB design package

[Jarno]

LOL, didn't see a schematic earlier, hefty f*ckin supply bypassing :-)

[Nevod]

Will there be "The Wire II"?
How about some really fast diff-amps, like AD8351 as input stage?
And how about using capacitance multiplier in the power supply? Just 4 more transistors for a much better performance.
Sorry if I'm too much off-topic.

[CraigCyril]

A headphone amplifier is an audio amplifier designed particularly to drive headphones instead of loudspeakers. You have finished your project and I want to say you thank a lot for share wonderful information.

[qusp]

@nevod: you have actually SEEN the performance of the current amp and read the datasheet of the amp you propose right? can you show any cause whatsoever why using an RF driver for audio presents an improvement? the needed compensation to slow it down. CMRR of this one sits at only 40db, has a typical output common mode offset of 40mV, max single rail supply voltage of 5.5v, so would need a totally separate power supply. max output of only 4.75v p2p, noise is orders of magnitude higher than opa1632, the speed is of no practical benefit whatsoever and that is what it has been tuned for at the expense of good performance where its actually useful for audio