[TLF1895]

Please add me to the list.

 

[gregeas]

Please add me to the pre-order list as well. Thanks.

 

[jckp919]

Please add me to the list.

 

[justin w.]

Good news everyone.  The next prototypes of the Pico Power circuit boards are here, and I believe the amp has now been finalized.  
 
 

 
The op-amp is OPA140, for those who have asked.  This provided the best mix of low noise, low distortion, near rail-to-rail voltage swing, and low current draw to keep battery life high.  The discrete output buffer uses 12 hand-matched, thru-hole components per amplifier.  The gain switch is now 3-way, with settings of about 0dB, 10dB, and 20dB.  The idle current draw of the amp is about 14mA, so battery life will depend on the mAH of the 9V batteries.  About 21.5 hours with 300mah NIMH and 36 hours with 500mah Li-Polymer.  Total PSU capacitance was also increased from 1320uF in Protoype #1 to 2720uF in Prototype #2 to 4000uF in the final version.  Thanks to new parts that keep getting smaller.
 
At this point, I'm just waiting for the enclosures to be machined and the special order parts to come in (the last of those expected end of September).

 

[dallan]

 

[monsieurguzel]

Hi Justin, please add me to the pre-order list also.  Thanks!

 

[justin w.]

I'll be bringing the prototype of this amp to the DC area meet on Saturday, and also the LA meet August 18
 
Links to both meets:
VA / MD / DC meet on Saturday, July 28, 2012
2012 Headphone Meet @ LAX Hilton - Saturday, August 18, 2012 - OFFICIAL THREAD

 

[OK-Guy]

Quote:

I'll be bringing the prototype of this amp to the DC area meet on Saturday, and also the LA meet August 18
 
Links to both meets:
VA / MD / DC meet on Saturday, July 28, 2012
2012 Headphone Meet @ LAX Hilton - Saturday, August 18, 2012 - OFFICIAL THREAD

 
Justin... if you have any finished by September... I'd be happy to take one to the Head-Fi meet at Cambridge, England 
 
http://www.head-fi.org/t/601003/uk-2012-head-fi-meet-september-15th-cambridgeshire

 

[justin w.]

Quote:

 
Justin... if you have any finished by September... I'd be happy to take one to the Head-Fi meet at Cambridge, England 
 
http://www.head-fi.org/t/601003/uk-2012-head-fi-meet-september-15th-cambridgeshire

 
sorry but probably not.  mid September is when I am expecting the enclosures to be finished machining, and then the enclosures still need to be polished/anodized after that.

 

[OK-Guy]

cheers for that Justin, appreciated.

 

[justin w.]

Sample leather case (which will be included) for the amp will be here Wednesday.  Hope it's good so I can post pics.

 

[jckp919]

Hope to see the leather case soon~
 
BTW, I read the technical spec of Pico Power, but since I am not familar with the electronic engineering stuff, I just wondering how the latest prototype sounds like.

 

[justin w.]

Just got the leather case today
 
 

 

 

[Radio_head]

Very nice looking.  Not nearly as bulky as I would have expected. 

 

[OK-Guy]

that will look well nice next to my WM-Z case... very stylish Justin, good choice indeedy.