Bam!

[murray]

@Natural Sound:
Do you know how many watts you can get with the 12 volt supply?

[Tubejack]

Suggest you check the specs here:   http://bottlehead.com/quicksand-battery-powered-solid-state-amplifier-specs/

[Natural Sound]

@Natural Sound:
Do you know how many watts you can get with the 12 volt supply?

No, I have no way of measuring that. The Bottlehead circuit is different from what I'm using so it's a moot point anyway.

.

[Paul Birkeland]

I'm sure that PB will jump in here and correct me if I'm wrong. The TPA3122 will run on 10 to 30 volts. Operating the chip at lower voltages will produce a little less power. I'm running a TPA3122 on a single 12 volt SLA behind a quickie. It sounds great in my shop where I don't require a ton of power.

Yes, this is true.  (The chip actually seems to run OK on 9V as well)

[Bonzo]

Will it be possible to use a (good) 18vdc switching psu?
Will this deteriorate sound quality too much?

Thank you

[Paul Birkeland]

I suspect that the 18V switching supply will work, but that the sound quality will deteriorate greatly.

There are some good papers available online that go into what happens in a switching supply when you operate outside of the rated supply current.  Essentially, things are really bad at either end, and a Class D amp is going to run you into the low end and high end of current demand frequently.

-PB

[Bonzo]

I suspect that the 18V switching supply will work, but that the sound quality will deteriorate greatly.

There are some good papers available online that go into what happens in a switching supply when you operate outside of the rated supply current.  Essentially, things are really bad at either end, and a Class D amp is going to run you into the low end and high end of current demand frequently.

-PB

Got it!
What about input sensitivity? It would be lovely to mate it with a quickie, but I noticed chip amps needs attenuation rather than amplification of the input signal
PS:Any underside pics? ;-)
Ciao!

[Paul Birkeland]

What about input sensitivity?

IIRC, gain is right around 20dB.  Since the Quickie isn't a particularly high gain preamp, they are a well suited match.

-PB

[Bonzo]

IIRC, gain is right around 20dB.  Since the Quickie isn't a particularly high gain preamp, they are a well suited match.

-PB

Thank you very much Paul!

[johnsonad]

Nice one! I look forward to hearing it!

[aragorn723]

How well would this amp do with 24V instead of 18?  2 12 volt SLAs would be a nice battery choice for this   I like my current SS power amp but this is kinda intriguing!

Dave

[Doc B.]

The amp will run on anything from 10 to 30 volts, just like it says a few posts up.

[satbaba]

Sennheiser HD800 compatible?
I'm still using crack OTL + speedball

[Paul Birkeland]

Sennheiser HD800 compatible?

Yes.

[Doc B.]

Thanks for all of the Quicksand orders the past 24 hours! The guys will be photographing the assembly today for the manual. We should have the oft requested underside photo very soon.