Here it is since you asked. - cheap-Jack - Tweakers' Asylum

Tweakers' Asylum

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

Here it is since you asked.

In Reply to: And your positive contribution was .......? nt posted by clifff on April 30, 2007 at 11:28:20:

Hi.
Here are up-to-the-point advice, bud.
The poster should not ask too much from his headphone amp, being an O/P current limited OP-amp design (my assumption only without first reading its schematic).
Not all headphone amps are design/built equal to handle headphones of all impedances. One very important thing is to check what recommnened headphone impedance range is specified for the headphone amp. Dont' try to drive headphone of too low impedances beyond the specified impedance of the amp! The 32R impedance headphone used by the poster is hell of a low low impedance load to any headphone amp!
Otherwise, it would only end up of overloading the headphone amp, resulting lousy sound or even blowing it since only so much signal current is available from the chips.
By this post, Cheaperic please don't need to do anything redundant, which technically wouldn't help much if not damaging it instead by virtue of the type of OP-amp chips used per the original design.
One safe so called upgrade is simply add a by-pass PP or PE film cap across the large O/P 'lytic cap to let the high frequencies pass into the headphone more smoothly. This will improve the sound.
A capacitor is by itself a complex AC network comprising its capacitance, serie DCR, self-inductance, dielectric loss resistance & insulation resistance. It is the self-inductance inside the 'lytic cap cause loss to high frequency signals.
c-J

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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

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

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