[RuiCanela]

Which opamp did you use?

 

[nsx_23]

For that first build, OPA2134PA

For my second build, which I've just finished, I used the same op-amp, but opted to run 2 9V batteries and a higher gain instead.

Big thank you to Fred_fred2004 for sending me the board and parts for this 2nd CMOY.

Now I have to try and case the 2 CMOYs, but my stupid little drill can't even drill through plastic takeaway containers..........

 

[RuiCanela]

what are the main differences in terms of sound quality? 9V versos 18V?

 

[nsx_23]

Hmm, I find that the 18V one drives my Proline 550s much better than the 9V one. Better treble and bass.

Need some more time to listen to them to really tell the difference.

 

[JackCrank]

So my friend and I just finished putting together our modified grado copies. It was my first project and I still feel like I don't know crap from shineola about it but damn was it fun! All I need now is a knob, a baseplate, and to figure out one little grounding issue and it'll be perfect. Sorry about the shoddy phone pics, I'm just super stoked to have this thing up and running. Next up, something with tubes!

 

[Arkku]

Hi,

Quote:

Originally Posted by fishski13 /img/forum/go_quote.gif arkku, beautiful! hope you enjoy the tunes.

Quote:

Originally Posted by MASantos /img/forum/go_quote.gif Very impressive! The panel work looks great and well thought of! How does it sound?

Thanks guys! I did prototype the panel with a couple of cardboard models to determine how to best place so many toggles. The spacing is a bit tight with the crossfeed if the lower toggles are turned up and upper ones down at the same time, but in practice it doesn't seem to be a problem.


As for the sound, I'm still waiting for my new AKG headphones to arrive, but testing on my old MB Quart QP-280's has been a pleasure; I find the sound much more “open” and “airy” than the headphone output on my mixer, and there's much less listening fatigue regardless of volume. (Crossfeed helps even more, but mostly I've been listening without it for now—it's great for background music, though.)

I've also been using the SOHA II as a pre-amp for my trusty old Creek A52 power amplifier, and it definitely adds a lot of depth and liveliness to the sound. Unfortunately, there's an audible hiss in this use (but not with headphones!)… as the hiss is independent of the volume control's position, I'll probably deal with it by padding the signal somewhat for the pre-amp outputs. (There's too much gain for pre-amp use, anyhow, so that should give a better volume control range as a bonus.)

The bottom line is: highly recommended; a very nice and versatile project, and not too difficult even as a first DIY amp. =)

 

[Fred_fred2004]

My daughter said we couldn't fit any thing into this little tin.
I used a surface mount TPA6111A2 on one side of the board and through hole componants on the other. Gain was 5 but its way to high and will make your ears bleed
Its got a temporary inpout socket I'll wire the input direct to the board I just wanted to hear it work. Sounds very nice and powerful

 

[FallenAngel]

Full info here.

3-channel modified Sijosae Class-A push/pull diamond buffer amp with stronger PSU.

 

[Fred_fred2004]

Daughter seen running away with it, these may be the only pictures I ever get

 

[nikongod]

Quote:

Originally Posted by Fred_fred2004 /img/forum/go_quote.gif I used a surface mount TPA6111A2 on one side of the board and through hole componants on the other. Gain was 5 but its way to high and will make your ears bleed

SWEET! Very nice work.
gain of 5 is way a lot

Quote:

Originally Posted by FallenAngel /img/forum/go_quote.gif 3-channel modified Sijosae Class-A push/pull diamond buffer amp with stronger PSU.

Also very nice work.
Which transistors did you use? I have been planning to add the Sijosae class-AB (its just driving cables, and SHOULD stay in class-A) output buffer to the passive EQ phono stage I built a while ago.

 

[FallenAngel]

Quote:

Originally Posted by nikongod /img/forum/go_quote.gif SWEET! Very nice work. gain of 5 is way a lot Also very nice work. Which transistors did you use? I have been planning to add the Sijosae class-AB (its just driving cables, and SHOULD stay in class-A) output buffer to the passive EQ phono stage I built a while ago.

Since I really like the Class-AB, I have TONS of BC327/BC337 around, so I used them.

I built a few Class-AB amps, they're totally awesome - huge battery life with proper opamps and sound great.

 

[bmwpowere36m3]

Just finished building my first 'real' amplifier and modified my old iPod Mini as my standalone DAC.

^^^Millet "SS" Hybrid & iModded Mini together at last...

 

[Beefy]

The design of that starving student is absolutely outstanding. Well done!

 

[Fred_fred2004]

Really impressive, wish I could do case work to that standard, top job

 

[linuxworks]

nice job, e36! you gonna add a 'dinan' badge to it?