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Old 11th November 2005, 04:44 AM   #11
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Quote:
Originally posted by Dominique
I had in mind to simply replace the op-amp for a stronger one, but after checking my gathered data, I couldn't find op-amps in a DIP package better than the NJM4556 (low impedance output), but only in SOIC and TO packages. Most of them are high speed, so it's not clear if they would work fine without tweaks in your existing circuit anyway.

Either you simply try your new headphones and listen if there's more distortion, build an outboard unit like anatech proposed, add a little pcb with a buffer in your preamp (then you could replace the NJM4556 for a weaker, but better op-amp), or use a SOIC op-amp with a SOIC to DIP adapter (but it's not guaranteed to work fine in your existing preamp (because all those strong SOICS on my list were high speed )

Sorry I couldn't be of much help!
Cheers,
Dominique
Hi Dominique, i replaced the op amp with the opa2132p and added the buf634t buffers and the difference is amazing! no problems at all driving the phones sounds great, and no back ground hiss or any type of audible distortion. thanks very much for your help, crippledchicken


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Old 11th November 2005, 03:24 PM   #12
anatech is offline anatech  Canada
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Hi crippledchicken,
I'm glad that worked out for you. Did you add a little sub PCB for the buffers, or put the entire circuit on it's own board?

I didn't think another chip existed for that purpose.

-Chris
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Old 11th November 2005, 04:16 PM   #13
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Quote:
Originally posted by anatech
Hi crippledchicken,
I'm glad that worked out for you. Did you add a little sub PCB for the buffers, or put the entire circuit on it's own board?

I didn't think another chip existed for that purpose.

-Chris
hi there, i just added another small pcb close to the op amp, containing the buffers and also 1k uf and .1 uf stacked film bypasses to buffer ps pins to ground. thanks for your help!
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Old 11th November 2005, 04:56 PM   #14
anatech is offline anatech  Canada
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Hi crippledchicken,
I might try that myself. I use 600 ohm AKG K240's, so it's easier for me, but the better quality op amps should sound better.

-Chris
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Old 11th November 2005, 06:45 PM   #15
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Quote:
Originally posted by anatech
Hi crippledchicken,
I might try that myself. I use 600 ohm AKG K240's, so it's easier for me, but the better quality op amps should sound better.

-Chris
yeah, it's sure worth trying. i get great dynamic transients now. some songs ,the snare drum really pops hard with authority when cranked up and the bass is great also! good luck, crippledchicken


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Old 11th November 2005, 07:18 PM   #16
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Did you include the buffer in the op-amps feedback loop or just running on its own?
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Old 11th November 2005, 08:04 PM   #17
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Quote:
Originally posted by richie00boy
Did you include the buffer in the op-amps feedback loop or just running on its own?
hi there, i put it in the feedback loop.
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Old 13th November 2005, 12:24 AM   #18
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I'm glad it worked out so well for you!
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