Good post, great info! Some clarification on my end...

Tweakers' Asylum

Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ.

Posted by CheapEric (A) on April 30, 2007 at 11:03:35

In Reply to: Re: A few questions about output capacitors on my headphone amp. posted by BrassTeacher on April 30, 2007 at 07:28:42:

Good post, Teacher! Don't worry about the length - as long as it contains good info, I'll read anything! Heck, I read "The Rise and Fall of the Third Reich" and found it so packed with great facts and info that the pages just flew by - read like a suspense novel.

Getting back to the task at hand...
Given your clear definition of 'dynamics', it's obvious I misused the word (see my response to clifff below).
As far as how responsive the headphones are, I have no clue how to answer you except to say that I think they are pretty good regarding the low passages. I always like a bit of volume with my Beyerdynamics DT331 (I think) only because they are open backed (what's the term again?), so not much soft stuff goes by unplayed or unnoticed.

My source is usually either of my CD players with original pressings. The chip is a TDA2005, and the kit is K143 from KitsRUs.com . The music played ranges from classic jazz to modern Rock to Trance, to softer female singer/songwriters.

As far as the noise floor is concerned, I increased the feedback resistors to reduce the gain, and the noise floor was reduced to the point where there's only a very slight hiss at volume levels that would blow the cans right off my head. I also piggybacked a 1000uf cap on the power supply end which improved the quality of the low end measurably.

Other mods that I'm also considering:
- adding another 9V battery in parallel to increase the mAh capacity
- adding a couple of 1.5 volt batteries to raise operational voltage
- subbing the cheap volume pot for an ALPS unit
- rewiring my headphones with silver wire and possibly hardwiring them to the pcb (I don't use them anywhere else, so why not?)

http://www.kitsrus.com/pdf/k143.pdf (Open in New Window)

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Follow Ups Full Thread

Topic - A few questions about output capacitors on my headphone amp. - CheapEric 06:20:57 04/30/07 (12)

Re: A few questions about output capacitors on my headphone amp. - BrassTeacher 07:28:42 04/30/07 (8)

Good post, great info! Some clarification on my end... - CheapEric 11:03:35 04/30/07 (0)

ZZzzzzzzzz. - cheap-Jack 11:02:44 04/30/07 (6)

Re: ZZzzzzzzzz. - BrassTeacher 15:15:30 04/30/07 (3)

Easy, can't you take a piece of humour? - cheap-Jack 18:39:57 04/30/07 (2)

Re: Easy, can't you take a piece of humour? - BrassTeacher 20:15:32 04/30/07 (1)

But your moniker suggested so. (A laugh only!) - cheap-Jack 12:07:52 05/01/07 (0)

And your positive contribution was .......? nt - clifff 11:28:20 04/30/07 (1)

Here it is since you asked. - cheap-Jack 12:38:39 04/30/07 (0)

Lf roll-off - clifff 07:28:06 04/30/07 (2)

My apologies - my glossary needs polishing... - CheapEric 10:24:16 04/30/07 (1)

Keep reading & asking! Only way to learn :-) - clifff 11:27:07 04/30/07 (0)

Follow Ups

Good post, great info! Some clarification on my end... - CheapEric 11:03:35 04/30/07 (0)

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