[Fred_fred2004]

This is based on a TPA6111A2 it's very similar to the PA2V2 amp, the trick to decent sound is the capacitors it needs a large output capacitance with a smaller fast acting cap across the large one, it uses a charging capacitor to delay the sound turn on and thus avoids and clicking or popping the headphones the sound takes about 1/2 a second to build up and so its very gentle on the headphones. Set to a gain of 5 its sounds very good and rich with a solid bass.
I put the chip on a small dip adapter and that allowed some of the circuitry to be under the chip and also a decoupling capacitor under the chip.

I'll get it in a case tomorrow

Thanks for looking
cheers

 

[Beefy]

Looks good fred! But what are you bothering with those dinky toys for, now you've got a real amp?

But seriously, how is the Millett treating you?

 

[Fred_fred2004]

Hi Beefy,

The BIG amp is great I use it while building the baby ones

You were right it sounds super with the AD700's

Its one of the best buys I've ever made

cheers

 

[Beefy]

Glad to hear it mate

 

[linuxworks]

Quote:

Originally Posted by Fred_fred2004 /img/forum/go_quote.gif This is based on a TPA6111A2 it's very similar to the PA2V2 amp

do you have more info on this? schematic, etc? looks interesting.

great job on the build. all home etched I assume?

 

[Ferrari]

Enclosure for my PPA + γ1 DAC combo (WIP), made from €1 aluminum profile and FPE faceplate.
This combo will serve as my office amp.

 

[krmathis]

Quote:

Originally Posted by adamus /img/forum/go_quote.gif finishing touches applied to the speaker amp. http://img338.imageshack.us/img338/9...eyfinalpx0.jpg

Dang! That one sure looks nice...
Well done!

 

[adamus]

cheers Krmathis, twas a satisfying build. It sounds much better than it looks!

 

[J.D.N]

Quote:

Originally Posted by Ferrari /img/forum/go_quote.gif Enclosure for my PPA + γ1 DAC combo (WIP), made from €1 aluminum profile and FPE faceplate. This combo will serve as my office amp.

Very nice indeed, don't suppose you'd like to share some pics of the internals and rear panel?

 

[apatN]

Quote:

Originally Posted by Ferrari /img/forum/go_quote.gif Enclosure for my PPA + γ1 DAC combo (WIP), made from €1 aluminum profile and FPE faceplate. This combo will serve as my office amp. ...

Wow very clean. You do great work!

 

[Ferrari]

Quote:

Originally Posted by J.D.N /img/forum/go_quote.gif Very nice indeed, don't suppose you'd like to share some pics of the internals and rear panel?

Thanks for the kind words gents!

Sure, I will post more pics when completed. I still have to wait for a shipment from Digikey to complete the γ1 DAC, before integrating the DAC into the amp.

For the moment, I still have another amp to complete.

 

[Fred_fred2004]

Quote:

Originally Posted by linuxworks /img/forum/go_quote.gif do you have more info on this? schematic, etc? looks interesting. great job on the build. all home etched I assume?

Yes all home made, here is my drawings they are not the best I don't really go for schematics, I roughed out the circuit on scrap paper and fleshed it out when laying out the board, so I added decoupling caps under the little board and additional decoupling at the power connection. It works on very low voltages the 3v I'm using gives a savage output. C3 is the startup cap too large a value and it takes minutes to start too low and it'll pop the earphones. Gain is set by R3/R4 I'm using 5, input caps are film my mistake on the drawing. Battery is permanently connected the switch on pin 5 puts the chip to sleep and it draws a few uamps.

I use PCBartist (free) so if you want the layout let me know
cheers

 

[Sodacose]

Here's a lamp:

Here's a CMOY:

Here's my Starving Student (currently hungering for tubes):

 

[cfcubed]

Proto PCB build of a Compact Tube Hybrid (CTH? CHAmp? ask runeight

Sounding great.... Done except for gray vinyl dye for the black endplates (this summer), and I won't get away without some ventilation holes in the top (or use that nice perforated alum). Big thanks to runeight for making this amp possible!

 

[tomb]

Very nice, cfcubed! That's one cute tube hybrid!