Post pics of your builds.... - Page 33 - Head-Fi: Covering Headphones, Earphones and Portable Audio

kloan · 02-13-2005, 10:15 PM

It runs off 2 AA?? No frickin way! That's wicked... can you share the plans on it? I'd love to make one..

jerb · 02-13-2005, 10:27 PM

thats awsome... please post plans

tyre · 02-14-2005, 05:29 AM

My only plan so far was to build something that was very inexpensive and low voltage. So far, I've only spent about $7 on parts. I haven't found a a case for it yet though. I was thinking of adding a Maxim MAX712 NiMH battery charger and maybe a MAX1722 DC to DC converter to step up the voltage to 5V. Then I could run it off of only one AA battery and just recharge it instead of using alkalines.

I have mine set to a gain of 5 and I can hear a slight hiss when using low impedance headphones, so you might want to try 4 or lower. I didn't bother using the Shutdown function. I just wired it to the ground pin and used a switch in between the batteries. Otherwise just follow the schematic in the datasheet and it works fine. I used low impedance electrolytics, metal film resistors and a really cheap $.95 100K Bourns pot from Allied. Unfortunately, the TPA6111a2 only comes in the SOIC package so you would have to use a Browndog or DIY adapter.

kloan · 02-14-2005, 06:06 AM

plans, as in a how-to

im really only familiar with the cmoy and mint..

tyre · 02-14-2005, 10:10 AM

Oh. That kind of plan. Well here's a basic protoboard layout I threw together with expresspcb since I have no idea how to use Eagle.

layout

Here's the schematic that I copied and pasted from the datasheet.

schematic

shiggins · 02-14-2005, 10:36 AM

Originally Posted by primer

Thanks shiggins, I was thinking of recasing my amp into a wider case with wooden panels but can't find any retailers that sells the R22 and T22. Did you get yours in the UK or ?.

Cheers

I ordered them from the "UK" Farnell, but were delivered from the US. Not cheap either.

skyskraper · 02-15-2005, 10:35 AM

we have a new colour!

uzziah · 02-15-2005, 11:07 AM

Originally Posted by PinkFloyd

I could eat that! beautiful image (who needs women with pics like that?)

Pinkie.

someone needs to quit soldering and get OUT

was ist los? · 02-16-2005, 06:49 AM

Not really headphone related, but i just built my preamp for my speaker rig. Based on a 12BH7A dual regulated PSUs and all the boutique parts.

http://photobucket.com/albums/v234/was_ist_los/

skyskraper · 02-16-2005, 08:17 AM

what circuit is that? is it a pcb based one? im looking for a nice not too expensive phono pre circuit...

edit: i see now its p2p but is it a line pre or phono?