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Re: dingo's DIY amp

Postby dingostolemyipod » Tue Feb 09, 2010 10:50 pm

dc wrote:happened to pass by a jaycar today and was tempted to buy that silicon chip headphone amp and power supply kit that was all the rage a little while back


I would expect your PPA already would outperform that, but might be fun for the hell of it. I've got the silicon pre-amp that i bought from altronics that has that exact amp in it as headphone out, it's good but not all that spectacular in standard form, you'd wanna swap the OPA2134 for something and maybe beef up the output stage, and probably a few other things too.
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Re: dingo's DIY amp

Postby dc » Wed Feb 10, 2010 11:06 am

well from my reading before I stopped reading the main mods were replacing the opamp with an LM4562 metal can, bypassing many of the superfluous components on the board and changing the output transistors to the nice toshibas, heatsinking them and putting higher bias through them. the other mod which was to the power supply was to implement a 'ripple eater' circuit. from what i could tell it was a beefed up regulator.
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Re: dingo's DIY amp

Postby dingostolemyipod » Mon Feb 15, 2010 12:13 am

ok! time for a quasi review of the ck2iii, and i'll try to restrain myself from blubbering like a fool, which i'm tempted to do after listening to it. I didn't do any side by side with any other gears, i just can't draw myself away from listening to this ;)

In one word, "natural". This is the most natural sounding amp i've ever heard, everything just sounds so right. It takes less away from the music than i'm used to, not that i realised this before, but now i know. I'm trying to work out what exactly if anything it adds to the music, as everything has a warmth and sweetness to it that i'm not used to at all. Even stuff that's supposed to sound awful still sounds sweet, lol. Details and dynamics are superb, revealing so much micro detail, but at the same time leaving them as micro details, not letting them spoil the show.

But the dynamics is where this beast has really opened my eyes (ears). This is dynamic, without being aggressive. This amp just opens up the dynamic range of the source material to a whole new level, stretches the dynamic range out, from the most prominent sound to the slightest detail, they just get stretched across a lot more space than i'm used to, although seemingly further apart still all perfectly clear and articulated. I'm somewhat used to amps with a good attack on transient notes, and this amp is no exception, but where this amp is most remarkable is on the decay side of things. This amp is so "fast" on the way back down. A transient note will be hit instantly, and just as quickly it is gone. Any percussive instrument just sounds awesome. The sizzle of cymbals is sweet as. Any dynamic variation, this amp will track it with a ruthless precision. This will make some things seemingly move up or down in the mix from what i'm used to, but i'd say this is just a result of the music being played more truthfully than the studio ever intended. One bad thing i noticed about the dynamics being so great, is it makes it too easy to listen to music too loud, a bit of a trap to watch out for there.

As for the frequency response or tonal characteristic of the amp, i can't fault it, if the music is bassy it'll sound bassy, if the music has a lot of mids it'll sound like a lot of mids, and likewise with the top end. The lows are brutal like a pit fighting dog, the highs are graceful and athletic like a female gymnast, and the mids are just sweet, sweet, sweet. Hit a real thumping bit of bass it this'll wanna mush your brains. The mids are great, vocals are always amazing with this amp as is a screaming guitar solo. The treble is so slick too, remaining composure and not going splashy or harsh at all.

Bass guitar just sounds so damn right from this amp, as do normal guitars too for that matter. Plain simple rock this thing really performs. It's also awesome for any acoustic instruments, jazz, or orchestral, esp. chamber or make that almost anything for that matter.

One area i did notice this amp falls down is when listening rather loud to rather busy passages of heavy distorted music, it did start to distort and blend everything together. But when this amp distorts, it doesn't go anywhere near as harsh as other amps, just a bit fuzzy and blurred detail, no high frequency harshness though.

Anyway i'll finish this here, lets just say i love it :D
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Re: dingo's DIY amp

Postby Beefy » Mon Feb 15, 2010 12:17 am

:thumbsup: :thumbsup:
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Re: dingo's DIY amp

Postby MomijiTMO » Mon Feb 15, 2010 6:25 am

I've also noticed the distortion you mention but my music never gets too busy for this to be a problem for me. If anyone is wondering, the CKKIII does drive the k701 pretty well. Great review mate :thumbsup:
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Re: dingo's DIY amp

Postby dc » Mon Feb 15, 2010 8:48 am

not a problem on the SR-404 :unibrow:
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Re: dingo's DIY amp

Postby MomijiTMO » Mon Feb 15, 2010 9:25 am

Shh you :p. I'm never getting into Stats. I guess I might one day.
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Re: dingo's DIY amp

Postby Naka » Mon Feb 15, 2010 10:15 am

How much did it cost all up dingo?
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Re: dingo's DIY amp

Postby dingostolemyipod » Mon Feb 15, 2010 10:21 am

Naka wrote:How much did it cost all up dingo?


As for stuff i bought, $95, as a lot of the stuff i either had on hand or stole from my dad.

To get your normal BOM would be around the $200 mark give or take, before casework.
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Re: dingo's DIY amp

Postby Blobby » Mon Feb 15, 2010 10:51 am

How about a picture of the finished product? Or have I missed something.
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Re: dingo's DIY amp

Postby dingostolemyipod » Mon Feb 15, 2010 11:32 am

Blobby wrote:How about a picture of the finished product? Or have I missed something.


It still looks the same as the previous picture. It's gonna take way longer to finish the casework than build the amp in the first place, especially cos i'll have to stop using it in order to finish it, that will be the hard part :lol:
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Re: dingo's DIY amp

Postby dc » Mon Feb 15, 2010 3:25 pm

nail it to a plank of wood with special lacquer and you're done! :lol:

honestly, these days I'm tempted to do just that were it not involving the many hundreds of volts needed for electrostatics =\
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Re: dingo's DIY amp

Postby MrBIG » Mon Feb 15, 2010 3:34 pm

Well done Dingo. It's always an exciting experience hearing something better (equipment wise) than what you have heard before, even better that you made it yourself. :thumbsup:
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Re: dingo's DIY amp

Postby Stu » Mon Feb 15, 2010 6:34 pm

dc wrote:nail it to a plank of wood with special lacquer and you're done! :lol:

honestly, these days I'm tempted to do just that were it not involving the many hundreds of volts needed for electrostatics =\


Nah, it has to have 3 legs on the bottom of the plank. You have to master these details, DC
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Re: dingo's DIY amp

Postby kimbo » Tue Feb 16, 2010 6:37 pm

Man, I like the sound of that amp dingo...wish I had DIY time. :(

You sound like you know what you're doing...and you're not too busy catching salmon like beefy.

Do you fancy adding to that DIY collection with a mini 3 kit? I can donate the entire kit to you free, and you just have to pay for postage etc if you want to build it. I thought you could compare it to your current build...and also the t-3h. Obviously it'll be crapper, but it's cheap!...I'll be interested in seeing how it'll compare anyway.

Then maybe the mini3 can be a passed around to other members who are curious to hear the mini3 and see if an el cheapo DIY amp makes a difference in their setup?

I've just got a kit here that is doing nothing but sitting.

Just a thought anyway...feel free to go "no way".

anyone else want to constructively use my mini3 kit that is doing nothing?
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