Go figure

[JBLoudG20]

The both of you, classic.

Lovedonahill is 2-2 today.

[Edwood]

Awesome, is that your patent?

[zippy2001]

Justin, that pico slim is just awesome. I love my pico, perfect with my laptop or imod. But the pico slim is just so damn sexy, i don't need it, but i want it anyway.

[Voltron]

Awesome, is that your patent?

Nope. I don't write 'em, I just enforce or shred 'em.

[Smeggy]

I'd love to see this volume contraption as a pcb we could add to amps, ....with a remote

[Grahame]

I'd love to see this volume contraption as a pcb we could add to amps, ....with a remote

and ... and ... a source selector, and a display, and a pony!

[HeadphoneAddict]

and ... and ... a source selector, and a display, and a pony!

Okay, now you've gone too overboard with that one.

Nobody really needs the display.

[Smeggy]

Yeah, a display? Pfft.

[Grahame]

Yeah, a display? Pfft.

Yeah, who would do that.

and put it in an amp as well.

Quite.

[justin]

I think there are already enough volume control kits available. This one could be made very small but that may not matter for DIY home amps

[Smeggy]

yeah, but yours sounds more better and with bigger range and accuracy, and stuff.

[cetoole]

Interesting. Without giving too many details away...... is the variable gain in addition to a voltage divider on the input, or volume control solely from variable gain?

IIRC, many of these digital attenuator ICs do two things for volume control, a voltage divider on the input and switched gain resistors for the following opamp. You want an output voltage below that of the input, the opamp runs at unity gain and the voltage on the input is divided down. You want greater than the input voltage, it starts to increase the gain of the opamp. Now, I have absolutely no idea what IC Justin is using here, so it is definitely possible it could be working different, but this seems a likely configuration.

[mnemonix]

Yeah, who would do that.

Nice, another Arduino fan ? Love those things. Running a coffee roaster with mine.

[swt61]

i'm going to make a Shakti amplifier. it's just a little pebble that you put in your pocket!

And all this time I thought you were just happy to see me.

[Hopstretch]

Mine's smaller than yours. Nyah nyah nyah nyah nyah.

The shadow is very small amp, LESS than 2 inches in length, LESS than 1.5 inche in width & around .42" in hight. We are still thinking that this is very very small to pair with any iPod or iPhone. The battery will sit below the PC brd. We are considering moving the battery next to the PC brd which in this case the length & width will increase to match the NANO but we might get the height down to .3 of an inch.

All specs are not final. We reserve the right to change any or all.

Ray Samuels

Think these'll get lost at all?

[justin]

Heh. Well that provides some valuable info. It means his battery is much smaller than the one I am using - so he can't be using the same volume control or it would never get the 10000 hour battery life required. It also means it will be push buttons or toggle switches, which I don't want to use mostly for 2 reasons: can't tell where the volume is without a display, and it loses the analog feel. I could probably shave off a couple hundredths of an inch by going with a weaker & harder to produce extrusion, but anymore than that and I'd have to start reducing the size of the battery and every mm will probably take 10 hours off the battery life. Why dont you ask how many steps and how much attenuation

Looking at diameters of 3.5mm plugs, one of the thinnest is the Neutrik at 0.35". Grado 1/4 to 1/8" adapters are 0.435", and ALO uses some that are up to 0.5" diameter. Which means any amp that is thinner than the plug is potentially going to have issues stacking with a DAP.

Edited May 20, 2009 by justin

[luvdunhill]

yeah, but will the Pico slim have the same signature as the BHSE, that's the real question

[justin]

We could just make portable amps the same size as iPod Shuffles. To save money, we can just buy the shuffles and disable the DAP functionality and add a line-in jack

[Iron_Dreamer]

LOL

[n_maher]

Why, exactly, is it ok for Ray to post details about a yet-to-be-released product in the open forums?

[tyrion]

Why, exactly, is it ok for Ray to post details about a yet-to-be-released product in the open forums?

Because he is special. The post was removed (not by me).

[spritzer]

Because he is special.

As in special ed.?

[Edwood]

[Chekhonte]

A picture of Ray's new portable amp was finally leaked. Not pictured are the 4 car batteries that are required to power it.

[Iron_Dreamer]

As in special ed.?

At least if you go by the lack of spelling and punctuation on his website