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Geek Pulse: Geek desktop DAC/AMP by Light Harmonics - Page 127

post #1891 of 2005

I can feel the release getting closer..  hopefully the beta people won't be under NDA and can tell us how awesome we are for backing this dac amp

post #1892 of 2005
Quote:
Originally Posted by uncola View Post
 

Do you guys think this would work as a poor man's linear power supply for the pulse?  or waste of time?  It says it does 12v 1.25 amps.. the transformer is only 7.5va though.. the real lps has a 30va one and is 12v 800ma.  also not sure what size power tip the pulse will need

 

http://www.ebay.com/itm/Hifi-linear-power-DC-1-USB-amp-DAC-external-power-supply-digital-display-SN-/191265584682?pt=US_Amplifier_Parts_Components&hash=item2c8851362a

 

the real LPS specs are:

110V/120V or 220V/240V 50/60 Hz AC input.
12V DC, 800mA output (uses the notoriously good power supply technology inside Da Vinci DAC)
5V DC, 500mA output in front panel via USB-A connector (Can be used with Geek Out via split USB cable to reduce power noise from computer.)
47,000uF Reservoir Capacitor (4700uF * 10) with zero switching off noise Schottky diode
30VA High Quality Noise Shielded Transformer


New LPS/4 specs announced this week, now it appears the "poor man's" unit you are considering is only on the edge of compatibility in terms of constant current, and not within the new spec of 1500mA peak. And that's assuming the specs on the "poor man's" unit are accurate and represent real life as opposed to "test bench only" attainable:

 

Geek Linear Power Supply:

Quote:
Update 8/7/2014: After a long test under load, Larry's team decided that they needed to increase LPS and LPS4's current capability to 1200 mA constant and 1500mA peak @ 12Vrms. This has added the concern of managing heat, which we're trying to resolve. The chassis must remain the same shape, but we have some ideas to use convection the way we do in Da Vinci to keep the heat down. This does put us a little more behind, but we think we can make up some time and still make our shipments happen on the same schedule we announced on 7/24.

Based on this I would not recommend buying that particular poor man's unit, although it might still work fine given the standard Pulse's PSU (non-LPS) that comes with a base model Pulse might not be any beefier, although it is probably a SMPS and so inherently different.

post #1893 of 2005

Interesting to hear so many reports on noise.

 

My GO 450 has no noise whatsoever.  My headphones are sensitive, although not IEMs.

 

Maybe this is an issue that varies with sample?

post #1894 of 2005
I bought in I think back in September or October with a delivery of June, it's now August.....not.....pleased.
post #1895 of 2005
Quote:
Originally Posted by Trav View Post

I bought in I think back in September or October with a delivery of June, it's now August.....not.....pleased.


just wait til 2015 arrives and you still don't have your unit...

post #1896 of 2005

Quick question on a cheper option for remote treaming into Geek Pulse: if I buy something like this (aptX Bluetooth adapter with coax/optical digital out), would it stream digitally my FLAC files from my PC/iPAD (and eventually even from Geek Wave, with BT stream) into Pulse ?

I guess this solution will not differ too much from the Geek current Bluetooth solution, and it would cost to me almost 3x less.

 

Or will the files be converted in the PC/iPAD by their own DAC, streamed as analog signal, reconverted with by ADC in the BT receiver and re-reconverted again with Pulse DAC (so basically losing the benefit of a higher end DAC) ?

 

 

 

As an alternative for remote streaming with Pulse, I was also thinking to use a Raspberry Pi connected to the Pulse (RPi USB out into Pulse USB in, and RPi connected to my home NAS), but I'm not sure if RPi will be able to cope with the stream rate of 24/96 or DSD files.

And I never setup a Pi ( just ordered one), so I'm not sure how easy this solution will be to implement.

post #1897 of 2005

Yeah those will both work, for the rpi you just have to load some music playing rom like mpd or daphile or one of those

post #1898 of 2005

"Week 4 of August 2014" is Monday.  http://lhlabs.com/updates/pulse-production-roadmap.html

 

Does anyone know if they are on track?

post #1899 of 2005

They updated the roadmap on 8/04/2014 so they can't be too far behind.. they're close enough to shipping the first units that I'm definitely able to stay positive but I decided to cancel my post survey femto because I want my GPX to ship sooner.  I'm ready for this baby to be given birth already :P

post #1900 of 2005

At the same time, I REALLY hope they don't rush it to get it out due to demand.

 

This is easy for me to say though because I'm really don't need it right now. My Asus E1 is doing a brilliant job with my PC.

post #1901 of 2005

I'm not familiar with how crowd funding works.  Well I know that if you buy ahead of time you get a good deal, but will it be on sale to the general public after all of the crowd funding people have gotten theirs?  I have only found this thread recently and it looks like something that I would purchase.  

post #1902 of 2005
Quote:
Originally Posted by vegasf1 View Post

I'm not familiar with how crowd funding works.  Well I know that if you buy ahead of time you get a good deal, but will it be on sale to the general public after all of the crowd funding people have gotten theirs?  I have only found this thread recently and it looks like something that I would purchase.  

Most crowd funding campaigns are made available for retail after the product comes out, but some are limited to the campaign only. I have backed 2 kickstarters that cannot be purchased.

I can say with absolute certainty that LHLabs wants to sell this at retail.
post #1903 of 2005

New updates, posting for the people who unsubscribed from indiegogo email

 

Geek Pulse

Update 8/18/2014: Femto clocks have arrived! Well, 900 of them, anyway. It may seem like a small thing, but we've been waiting on these things for a LONG time, so we're pretty excited. All of the upgraded opamps have also arrived. Geek Pulse boards are officially being assembled. Now we're just waiting for the new Pulse X / S boards to show up (the ones we snuck in some changes to while we were waiting for the femto clocks) so we can start that assembly run.

 

 

LPS/LPS4

Update 8/18/2014: In order to lower Johnson noise throughout the 12V supply in LPS4, we decided to make a change to two out of LPS 4's 12V outputs down to a power rating of 500mA. These two 500mA outputs are to be used with lower power consumption devices from the Geek Pulse family. The other two 12V outputs will have their power output raised to 1200mA!

 

  • Output 1 (1200 mA): Geek Pulse DAC
  • Output 2 (500 mA): Geek Blue/Geek Air
  • Output 3 (1200 mA): Geek Preamp (formal name TBD) / Geek Dedicated Headphone Amp (formal name TBD)
  • Output 4 (500 mA): Geek Phono (formal name TBD)
post #1904 of 2005
Thread Starter 

I'm interested on that Geek dedicated headphone amp....

 

Now I am happy why I upgraded to LPS4. :bigsmile_face: 


Edited by m-i-c-k-e-y - 8/18/14 at 4:08pm
post #1905 of 2005
Quote:
Originally Posted by m-i-c-k-e-y View Post
 

I'm interested on that Geek dedicated headphone amp....

 

Now I am happy why I upgraded to LPS4. :bigsmile_face: 

i had emailed gavin early on, kinda regretting having upgraded, and i was wondering if i could just go go back base model.

he talked me out of downgrading ,  now i'm kinda glad he did !! 

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