Owen, just had another look at the graphs you posted... do you have one available for THD sweep against frequency? If not perhaps you could make one when you do your further tests? Would be great to see that graph, especially with unbalanced input and 2k ohm source resistance (say, at about 50 mW into 30R with parallel capacitance).
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Hi Guys,
I'll update the list and re-post it tonight. To be clear - The kit price includes the parts listed in the BOM, both PCB's, and shipping to anywhere.
icewall and meanman 1964:
Please go back and read at least the last three pages of this thread. Everything you asked is answered there. I can't re-post the same info on every page.
Cheers,
Owen
I'll update the list and re-post it tonight. To be clear - The kit price includes the parts listed in the BOM, both PCB's, and shipping to anywhere.
icewall and meanman 1964:
Please go back and read at least the last three pages of this thread. Everything you asked is answered there. I can't re-post the same info on every page.
Cheers,
Owen
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no, not so many, but there are still a fair few, this forum has produced a few ive seen, along with the SMD M4, the miniv3 portable along with a few other portables. certainly not as common as through hole designs i'll give you that, but people seem scared by SMD in general, not just headamps, when once a technique is forged its actually much easier and quicker to solder SMD, given the physical ability
yeah looks that way, I think i'm going to get the parts for one kit on their way with my DK, so just keep me with 1 SMD kit (i'll cost it out as I dont have the power supplies) so may still turn out cheaper for me to just buy my own, i'll follow up with email.
PA's QRV08 headamp boards are very good, I like them, SMD is about as much as your amps share in common though, power supply is about as opposite as they get, with PA having 4 discrete (well apart from the opamps
) super regulators per board along with pretty much everything else that could be discrete being so.both measure very well and both will be very technically adept, it will be an interesting comparison. the QRV08 amp section probably has quite low PSRR by comparison, but doesnt need it as the PSU is onboard and of very high quality, where your amp has excellent PSRR, so not so much is needed of PSU, nothing wrong with either school and the results speak for themselves, but VERY different. just look at the 2 BOMs, sourcing everything for the qrv's was a bit of a nightmare and the number of parts quite massive, while I could just about write the BOM for 'the wire' on the back of my hand
the PSU is part of what makes 'the wire' so accessible as well, a really great performing and easy to build design. anyone who has them, or can still find them, I would recommend going with LT1085/1033 for the regulators and if those are not available, grab the linear tech version LT317/337 in place of the LM series, although again with such high PSRR the benefits may not be so great.
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