Well, I've built my opamp based pre-amp and tried out the OPA2134PA, OPA2604AP, OPA2132P, LM6172 opamps and am sticking with the OPA2132P for now (using a socket, and apparently the LM6172's don't like sockets). I don't need many of them so I just go with free samples and was wondering if there are any other good opamps worth mentioning which would do better then the OPA2132P? I'm using dual's so the AD825, AD845 and OA627 are unfortunately not possible.
EDIT: Wow, I decided to slap in the LM6172 in the socket and it apparently doesn't have any rpoblems with it at all, sounds very nice. I heard there was a new improved version of this? Anyone know what it is and if it's available in a dual opamp?
EDIT: Wow, I decided to slap in the LM6172 in the socket and it apparently doesn't have any rpoblems with it at all, sounds very nice. I heard there was a new improved version of this? Anyone know what it is and if it's available in a dual opamp?
hi,
think you definitely tried some of the best opamps.
the new version of the LM6172 was something like LM71xx.
for further information try www.headwize.com; these guys know any good opamps, buffers...
think you definitely tried some of the best opamps.
the new version of the LM6172 was something like LM71xx.
for further information try www.headwize.com; these guys know any good opamps, buffers...
Thanks, just wanting to know if I left any out. I knew about the LM7171, but it's only available in singles and doesn't seem to have any improvements, as well as people not really liking it, so... I guess I'll stick with my LM6172, they sound nice to me anyways, and I guess that's all that counts.
yeah, the chips are supposed to be very good.
i have a few but the PCB´s i designed with it never seemed to work properly. all circuits ended up as a kinda radio station.lol
i actually like opa134,2134 more cause they´re less sensitive and they sound really good.
BTW:ever tried a opamp based power amplifier? for example rod elliot´s design?
i´m really interested to build one of those but don´t know if it´s worth it.
i have a few but the PCB´s i designed with it never seemed to work properly. all circuits ended up as a kinda radio station.lol
i actually like opa134,2134 more cause they´re less sensitive and they sound really good.
BTW:ever tried a opamp based power amplifier? for example rod elliot´s design?
i´m really interested to build one of those but don´t know if it´s worth it.
Well, I'm just about finished my opamp based power-amp based on Rod Elliots LM3875 project. I'm using the LM3886T, five of them for five channels. I've finished off the amp-modules/heatsinks and chasis. I'm just waiting for my transformers for my power suply. Some people consider them "audiophile quality" and others don't. I'll let you know how it goes.
Joebob
what do you mean by 'lm6172 don't like sockets'????
Do the pins open up wide as you bring the IC close to the socket to signal their refuse to get in?
I have used them in the past and I have had no problems.
what do you mean by 'lm6172 don't like sockets'????
Do the pins open up wide as you bring the IC close to the socket to signal their refuse to get in?
I have used them in the past and I have had no problems.
Many people on the headwize forums have said that the use of LM6172's in sockets would cause them to oscilate very easily. Although when I tried it in my socket after I made the post and it worked perfectly fine as well, I don't know why they thought so though...
if you have to use sockets, get the 'tuned-pin' style or even better, there are gold plated turned pin ones with built in decoupling caps
Grataku
Many modern high-speed op-amps can become unstable due to the increased parasitic capacitance introduced by ic sockets. It is best to keep these devices as close to the ground plane as possible. If interchangability is a must, it is usually recommended that pin racks be used.
Geoff
Many modern high-speed op-amps can become unstable due to the increased parasitic capacitance introduced by ic sockets. It is best to keep these devices as close to the ground plane as possible. If interchangability is a must, it is usually recommended that pin racks be used.
Geoff
Higher bandwidth, I think. More prone to oscillation. Not a given, though, as Joebob has found (you must be using good wiring practice).
Agree, don't EVER use cheap sockets. Even if they're more expensive than the IC.
Agree, don't EVER use cheap sockets. Even if they're more expensive than the IC.
joebob, i actually meant an opamp like opa134 followed by discrete stage just like rod elliot´s project.
i built a power amplifier with an lm3886TF (my first) and was amazed by the good sound.
i think you´ll be happy with it.
i just have to add an input selector and will use that for my hifi setup.
i built a power amplifier with an lm3886TF (my first) and was amazed by the good sound.
i think you´ll be happy with it.
i just have to add an input selector and will use that for my hifi setup.
Ya, I had noticed that one too, didn't think of that until I already posted. I hope I get as good results out of my LM3886T as you did...
hi Joensd,
Im using opa2134 right now . The mid and low is good but the hi like ... a bit over bright and reverb/distortion ! Have u got this type of problem ?
Im using opa2134 right now . The mid and low is good but the hi like ... a bit over bright and reverb/distortion ! Have u got this type of problem ?
TJ
The OPA2134, like most of the op-amps mentioned in this thread, is a high quality device - much better than devices used in much of the recording equipment CD's are produced with. Distinctly noticeable HF problems will be due to your circuit or some other factor, and almost certainly not your opamp.
Jamie
The OPA2134, like most of the op-amps mentioned in this thread, is a high quality device - much better than devices used in much of the recording equipment CD's are produced with. Distinctly noticeable HF problems will be due to your circuit or some other factor, and almost certainly not your opamp.
Jamie
the opa2134 is definitely high quality device but never had such big problems as with the lm6171 for example.
what do you use it for TJ?
check the supply and how much current is floating into the device.
it´s probably oscillating.
what do you use it for TJ?
check the supply and how much current is floating into the device.
it´s probably oscillating.
Somebody in another thread mentioned the AD8610. Took a look at the datasheet; it does look impressive, especially the specific comparsions to the OPA627, long heralded as one of the best you could get.
Unfortunately, another DIY pain in the butt - surface mount only (like the AD825)
mlloyd1
Unfortunately, another DIY pain in the butt - surface mount only (like the AD825)
mlloyd1
Surface mount only? Ugh... Kinda like the AD825 and AD845, I wonder why they only make surface mount?
Hi , im using opa2134 to replace my Marantz 67 Njm2114 . The HI slightly bright ! How to make it smooth on HI ?
Thank !
Thank !
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