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Old 14th August 2003, 04:37 PM   #1
iceman is offline iceman  Sweden
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Talking Headphone amp

I've just built me an headphone-amp, it's an OPA2134 from Burr-Brown(Free samples). The powersupply is 2 6volt in serie(+-12volt).
The sound is great, atleast in my AKG headphones.
I post some pictures and schematic later(tomorrow) if anyone are intressed.

Question: Is it hard to build some kind of bassBoost to the amp ?
Anyone have a schema?
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Old 15th August 2003, 11:07 PM   #2
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Go to www.head-fi.org .

That is ground central for DIY headphoning. They can help you easily.

GnD
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Old 16th August 2003, 12:38 AM   #3
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Also, if you have a CMoy design (most common 1st headphone amp) you can tweak the bass by playing with the signal coupling cap values.

Mine headphone amp is under the thread "my new baby" on this forum. The circuit is at:

http://www.tangentsoft.net/audio/cmoy-tutorial/

His (Tangent's) advice on signal-coupling cap tweaking for bass enhancement is at:

http://www.tangentsoft.net/audio/cmo...eaks.html#caps

GnD
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Old 19th August 2003, 05:15 AM   #4
iceman is offline iceman  Sweden
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Default schema/pcb

Here's the headphone-amp i've built:
Attached Images
File Type: png opa2134.png (19.8 KB, 712 views)
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Old 19th August 2003, 06:36 AM   #5
Electrons are yellow and more is better!
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Not bad, iceman but I would have put two 100nF/50-63V polyester, ceramic decoupling caps in parallel whith those you got (C1, C2). It never hurts, mostly the opposite.
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Old 19th August 2003, 07:03 AM   #6
iceman is offline iceman  Sweden
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Default caps

Thanks for
I'm sorry for the confusing picture/text.
The input-caps are not electrolyt, I do have 0,1µF ceramic there instead of 4,7µF
But i do ghange it soon

A friend give me the advice to change the ceramic to MKT-caps instead because he think the ceramic could act like a highpass-filter, is he right about that ??
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Old 19th August 2003, 07:39 AM   #7
Electrons are yellow and more is better!
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If you admit that you use ceramic caps as input caps you will get the big wolves after you.

It's not very common to use ceramics because of the poor properties in audio performance. I don't say that the amp will sound like a disaster but almost anything else is better. Start with polyester or polypropulene.

The input filter IS a highpass filter!

f = 1/(2*pi*R*C)

It never hurts to combine this filter with a lowpass filter. I would suggest 50-150 kHz as cut frequeny.

1 k + 1 n to 3.3 nF this is good to reject RF disturbance.
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Old 19th August 2003, 07:44 AM   #8
iceman is offline iceman  Sweden
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Default caps

Beware of the wolves

Thanks for the help.
I go and buy me polypropulene caps today.
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Old 19th August 2003, 07:48 AM   #9
Electrons are yellow and more is better!
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I forgot, it's common pratice to have 100 ohms in series with output. This is only if you use both low impedance or high impedance headphones.
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Old 19th August 2003, 11:02 AM   #10
joensd is offline joensd  Germany
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Hi iceman,
I remember there was a nice bass boost circuit on either
Headwize or HeadFi .
Go to DIY-forums and search for bass boost from ppl.

Cheers
Jens
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