luvdunhill Posted May 12, 2009 Report Share Posted May 12, 2009 60dB if your lucky, channel matching is totally conditional on how well the parts are hand-matched not really luck, just buy 500 of them.. also, most system problems are easily alleviated with a simple buffer, if you have to be able to support every possible equipment chain out there... Quote Link to comment Share on other sites More sharing options...
luvdunhill Posted May 12, 2009 Report Share Posted May 12, 2009 (edited) hey no fair, you edited your post and it changed my quoted portion of your post Edited May 12, 2009 by luvdunhill Quote Link to comment Share on other sites More sharing options...
justin Posted May 12, 2009 Report Share Posted May 12, 2009 60dB if your lucky, channel matching is totally conditional on how well the parts are hand-matched. LDR's sound great, but they are fiddly as hell and probably require better system matching than most people will do. Melos used hand-selected parts for their success. The photentiometer used a full-on automotive dome-light bulb for light source: it could be replaced with an LED sure, but it would still be drawing tons of current to get a high attenuation. i'll stick with my 110dB attenuation. 60dB, 70dB attenuation, those are listening levels with some IEMs and some source output levels. Quote Link to comment Share on other sites More sharing options...
kevin gilmore Posted May 12, 2009 Report Share Posted May 12, 2009 LDR's suck when it comes to stability WRT temperature. Anyone that has ever had to fix a marantz 10B would know this. Bad idea for portables. Quote Link to comment Share on other sites More sharing options...
luvdunhill Posted May 12, 2009 Report Share Posted May 12, 2009 LDR's suck when it comes to stability WRT temperature. Anyone that has ever had to fix a marantz 10B would know this. Bad idea for portables. Thank god there are other devices available now that weren't produced 45 years ago. Quote Link to comment Share on other sites More sharing options...
kevin gilmore Posted May 12, 2009 Report Share Posted May 12, 2009 The things in the melos drifted more than 1db just by waving paper over them. The temp curves of the photodiode and led would have to match extremely well to make this work. Since the two are completely different semiconductor processes, this is almost impossible. Quote Link to comment Share on other sites More sharing options...
The Monkey Posted May 13, 2009 Report Share Posted May 13, 2009 shit, I'm making a portable amp with NO volume control. gunna be thin son. This makes me laugh each time I read it. Quote Link to comment Share on other sites More sharing options...
Dash Posted May 13, 2009 Report Share Posted May 13, 2009 This makes me laugh each time I read it. Me as well. Quote Link to comment Share on other sites More sharing options...
naamanf Posted May 13, 2009 Report Share Posted May 13, 2009 Me as well. It almost makes sense to make a portable amp without a volume control because they are going to be used with a portable device that already has a volume control. Quote Link to comment Share on other sites More sharing options...
naamanf Posted May 13, 2009 Report Share Posted May 13, 2009 unless they use a line out. True. But how many people actually use iphones/ipods:rolleyes: Quote Link to comment Share on other sites More sharing options...
Dusty Chalk Posted May 13, 2009 Report Share Posted May 13, 2009 unless they use a line out.It would still make sense if one wanted to BLOW FOOL HEAD OFF. Quote Link to comment Share on other sites More sharing options...
Fungi Posted May 13, 2009 Report Share Posted May 13, 2009 My Sony player has a line out too! Not that I'd use an amp with it. Hell, that's the reason I went with this player. Quote Link to comment Share on other sites More sharing options...
justin Posted May 13, 2009 Report Share Posted May 13, 2009 Edwood came through with another fantastic rendering, this time of the Pico Slim Quote Link to comment Share on other sites More sharing options...
penger Posted May 13, 2009 Report Share Posted May 13, 2009 Oh man that is sexy. Quote Link to comment Share on other sites More sharing options...
Beefy Posted May 13, 2009 Report Share Posted May 13, 2009 That really is spectacular...... a portable amp that is genuinely small enough to carry around with you. Quote Link to comment Share on other sites More sharing options...
Guest sachu Posted May 13, 2009 Report Share Posted May 13, 2009 holy mother Mary Jesus....that is alluring. Quote Link to comment Share on other sites More sharing options...
HeadphoneAddict Posted May 13, 2009 Report Share Posted May 13, 2009 I'm IN !!!! Looking forward to something the size of my iBasso T4 but with better sound. My Xin Super Mini may never show up... Quote Link to comment Share on other sites More sharing options...
Smeggy Posted May 13, 2009 Report Share Posted May 13, 2009 What he didn't say was that it's like 8" deep Seriously cool Justin, if it comes out like that it'll be one sexy amp. Quote Link to comment Share on other sites More sharing options...
Asr Posted May 13, 2009 Report Share Posted May 13, 2009 Damn, that is sweet. I might buy one just to look at it, since I prefer using my IEMs directly from my DAP. Which kinda leads me to ask, is the market for IEM-oriented amps really that big? Not sure I get why so many people bother amping their IEMs. Quote Link to comment Share on other sites More sharing options...
justin Posted May 13, 2009 Report Share Posted May 13, 2009 Damn, that is sweet. I might buy one just to look at it, since I prefer using my IEMs directly from my DAP. Which kinda leads me to ask, is the market for IEM-oriented amps really that big? Not sure I get why so many people bother amping their IEMs. It has as much power as most other lithium powered amps. The 'regular' Pico runs on a 2-cell, 8.4V battery, but that's unusual. So, its not specifically for IEMs, but if it can be the first choice of anyone with IEMs, I think I can live with that. A lot of the idea of this amp is to make a portable for people who aren't interested in portables because they are too bulky and offer little or no improvement. This solves those problems by being thin and offering a range of volume adjustment and precision left/right matching that you can't get from a DAP. Also, some IEMs like the Livewires and Westone ES3X are unusable from many DAPs/phones due to the amount of hiss from their headphone jacks. Quote Link to comment Share on other sites More sharing options...
Duggeh Posted May 13, 2009 Report Share Posted May 13, 2009 Very very slick indeed. Quote Link to comment Share on other sites More sharing options...
spritzer Posted May 13, 2009 Report Share Posted May 13, 2009 ...now we just need an electrostatic version. Quote Link to comment Share on other sites More sharing options...
uberburger101 Posted May 13, 2009 Report Share Posted May 13, 2009 And I thought the Pico couldn't get any slicker. Quote Link to comment Share on other sites More sharing options...
Duggeh Posted May 13, 2009 Report Share Posted May 13, 2009 If as Wikipedia says, a US quarter coin is 24.26mm in diameter, then using the mathematical exactitude of guesswork in shrink % and holding a ruler up to my monitor this is the actual size of the unit: Which is Quote Link to comment Share on other sites More sharing options...
The Monkey Posted May 13, 2009 Report Share Posted May 13, 2009 It needs an optional money clip. Quote Link to comment Share on other sites More sharing options...
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