Well, this appears to be prety much the ultimate op-amp (for now) specs are pretty damn impressive. Thought i might order myself a couple of samples and mount them on soic adapters. Firstly has anyone tried em? Opinions? And second - when i ask for samples from AD it says package quantity - 98 ! (and yes it is the right part!) I dont want 98 - i only want 2! Or is it referring to somthnig else. Cheers
I'm sure it's a nice chip (although the AD8610/AD8620 still look nicer to me, I have both chips, just haven't tried them yet) but the suply voltages shouldn't be exceeded (normally +/- 15V is what's fed to opamps, although I do believe the 5532 can handle even more voltage, +/- 22V if I'm correct, so beware). You could always make a small PCB with voltage regulators and the opamp on it, solder pins on the bottom in the standard dip package and just use that as a replacement. I could see that being more useful as an opamp replacement than the lcaudio modules, then it could altually be used at the standard opamp voltages, because even +/- 12V would be too close to the max voltages for my liking.
The AD-8065 and AD-8610 are my present most favored op amps. The AD8610 is smooth and real easy to use its detailed and lot’s of Air. I use it quite often in my Buffered output Headphone Amps with the HA-5002 Buffer. The AD8610 has a lot lower DC offset voltage in the same circuit as a OPA-627 and the BB chip is already quite good on DC specs. This Op amp has that Analog devices sound of Punchy and extended bass with greater Punch in the in the Mid-bass than the OPA627. The top octave is apparently more extended on the AD chip vs the BB however that is only my subjective view. I take listening testing as serious as performance testing.
The AD-8065 is another Op Amp I use a lot and this chip is simply amazing if used correctly. If not properly bypassed with two levels of caps this chip will peak in the MHz. range and sound metallic however strangely not harsh or have the grain that other high speed op amps do if misused. If detail is your goal and your source is top notch this Op amp is about as good as it gets for line gain stages have not tried it in I/v stages yet. If using this with a buffer I like the 275 MHz OPA-633 and HA3-5033-5 with chip real smooth and detailed with a wide and consistent sound stage. I highly recommend that you give these Op amps a listen. Another great thing about the AD-8065 is it is low cost and that always helps.
http://www.analog.com/UploadedFiles/Data_Sheets/921894817AD8065_6_c.pdf
http://www.lcaudio.dk/com/ad8065.htm
http://home.earthlink.net/~goodclose/joann.html The Designers home page
The AD-8065 is another Op Amp I use a lot and this chip is simply amazing if used correctly. If not properly bypassed with two levels of caps this chip will peak in the MHz. range and sound metallic however strangely not harsh or have the grain that other high speed op amps do if misused. If detail is your goal and your source is top notch this Op amp is about as good as it gets for line gain stages have not tried it in I/v stages yet. If using this with a buffer I like the 275 MHz OPA-633 and HA3-5033-5 with chip real smooth and detailed with a wide and consistent sound stage. I highly recommend that you give these Op amps a listen. Another great thing about the AD-8065 is it is low cost and that always helps.
http://www.analog.com/UploadedFiles/Data_Sheets/921894817AD8065_6_c.pdf
http://www.lcaudio.dk/com/ad8065.htm
http://home.earthlink.net/~goodclose/joann.html The Designers home page
The AD-843 is still a nice sounding Op Amp. It’s Kind of powerful in the Bass, More so than ether of these op amps. It also has a magical synergy with the now discontinued elantec EL-2009 Buffer. The midrange on the AD-8610 and the AD-8065 is not as washed out as it is on the AD-843. However for those that wish an alternative the the BB OPA-637 the AD-843 is definitely something to look in to and if you’re a bass head the AD843 is the one.
Since the elantec Buffers are no longer available the synergy of the AD843 is not as great and I prefer the refinements of the 8610 and the 8065/66 more now days. Also note that non of these opa’s were evaluated on there own all were used with open loop buffers and within the Multi-Loop feedback technique as described by Walt Jung in the September and December issue of EDN. So your mileage may very if used in other arrangements.
Since the elantec Buffers are no longer available the synergy of the AD843 is not as great and I prefer the refinements of the 8610 and the 8065/66 more now days. Also note that non of these opa’s were evaluated on there own all were used with open loop buffers and within the Multi-Loop feedback technique as described by Walt Jung in the September and December issue of EDN. So your mileage may very if used in other arrangements.
does anyone know the information of AD 8061/W4 ? or is it similar to some other Philips speaker?
i would like to build a new box to it
i've got some pictures also:
http://www.zone.ee/75gdn-3-4/bass/
http://www.zone.ee/75gdn-3-4/kast
i would like to build a new box to it
i've got some pictures also:
http://www.zone.ee/75gdn-3-4/bass/
http://www.zone.ee/75gdn-3-4/kast
I recently changed the OP-Amp in my CDP to AD8065 circuit from LC Audio
http://www.lcaudio.dk/com/index.php?page=5
The rest of the analog output is untouched and looks like this:
http://kotiweb.kotiportti.fi/audiovideo/DIY/cdout/kaavio.png
I'm pretty sure that this is not the best possible configuration for this OPA.
(I know that I should get rid of those nasty muting transistors
)
I've read that some of you have bypassed output caps completely in case that DC offset has been low enough (few mV ?)
An another good solution is to replace the output caps with super-e-caps (two black gate caps parallel with reversed polarities)
like this:
http://www.blackgate.jp/ebg6.htm
The capacitance of the output caps is 100 uF at the moment. Some people have used 47 uF and say that lower values cause weakness in lower frequencys. However Black Gate seems to recommend 10 uF value in their example.
What kind of output cap have you used with AD8065 or have you bypassed them? Have you tried different configurations?
An another thing that is bothering me are the resistors in the output. There's two 470 ohm resistors in series. Are they really necessary with AD8065 or can I use smaller values?
What other modifications would you make to analog output now that the opa has been changed to AD8065?
Here's some more pics:
http://kotiweb.kotiportti.fi/audiovideo/DIY/cdout/
Any help or an internet link to an answer would be greatly appreciated. I've been seaching for answers a long time and I'm beginning to lose hope.
http://www.lcaudio.dk/com/index.php?page=5
The rest of the analog output is untouched and looks like this:
http://kotiweb.kotiportti.fi/audiovideo/DIY/cdout/kaavio.png
I'm pretty sure that this is not the best possible configuration for this OPA.
(I know that I should get rid of those nasty muting transistors
)I've read that some of you have bypassed output caps completely in case that DC offset has been low enough (few mV ?)
An another good solution is to replace the output caps with super-e-caps (two black gate caps parallel with reversed polarities)
like this:
http://www.blackgate.jp/ebg6.htm
The capacitance of the output caps is 100 uF at the moment. Some people have used 47 uF and say that lower values cause weakness in lower frequencys. However Black Gate seems to recommend 10 uF value in their example.
What kind of output cap have you used with AD8065 or have you bypassed them? Have you tried different configurations?
An another thing that is bothering me are the resistors in the output. There's two 470 ohm resistors in series. Are they really necessary with AD8065 or can I use smaller values?
What other modifications would you make to analog output now that the opa has been changed to AD8065?
Here's some more pics:
http://kotiweb.kotiportti.fi/audiovideo/DIY/cdout/
Any help or an internet link to an answer would be greatly appreciated. I've been seaching for answers a long time and I'm beginning to lose hope.
DIAR said:(I know that I should get rid of those nasty muting transistors
Remove them, but keep them for some time just in case the player makes strange noises (normaly just at power on/off, no problem for me, but there are "special cases").
DIAR said:
Much smaller.
Use something around 50ohms.
Low impedance output always sounds much better to me.
DIAR said:
If you measured that value before the caps, you can remove them.
Thanks Carlos
I measured the dc offset by the OPA. What do you concider to be the maximum value of dc offset in CDP output that can be allowed.
How do I know if dc offset causes problems. Should I measure dc offset from power amp output?
I use the CDP with passive preamp and Densen Beat B300XS.
I measured the dc offset by the OPA. What do you concider to be the maximum value of dc offset in CDP output that can be allowed.
How do I know if dc offset causes problems. Should I measure dc offset from power amp output?
I use the CDP with passive preamp and Densen Beat B300XS.
ad8066 very finicky in my cdp
they are installed on browndog adapt. beefd up ps schottky rectifiers. plenty of ps filtering. op amps are bypassed and, decoupled at every power pin also have .1uf stacked film bridging +/- power pins of op amps. my results, they run so hot you can't hardly put your finger on them very long or you will get a blister. i replaced them with lm6172s as straight drop in and sounds excelent with no heat at all. the ad8066s were being powered with their max, +/- 12v. so i don't know if thats my problem or, the 100mhz bw. of the lm6172s vs the 145mhz bw. of the ad8066s causing the over heat problems maybe, because of my particular circuit, and grounding schemes of this unit which is a cheap onkyo dx-7211 model. beats me! oh well, the 6172s sound excelent any way so, i guess i'll leave them in for now. just thought i'd share this tid bit reguards, crippledchicken
they are installed on browndog adapt. beefd up ps schottky rectifiers. plenty of ps filtering. op amps are bypassed and, decoupled at every power pin also have .1uf stacked film bridging +/- power pins of op amps. my results, they run so hot you can't hardly put your finger on them very long or you will get a blister. i replaced them with lm6172s as straight drop in and sounds excelent with no heat at all. the ad8066s were being powered with their max, +/- 12v. so i don't know if thats my problem or, the 100mhz bw. of the lm6172s vs the 145mhz bw. of the ad8066s causing the over heat problems maybe, because of my particular circuit, and grounding schemes of this unit which is a cheap onkyo dx-7211 model. beats me! oh well, the 6172s sound excelent any way so, i guess i'll leave them in for now. just thought i'd share this tid bit reguards, crippledchicken
Is there really a better dual op-amp for general use than the LM6172?
This is an excellent sounding op-amp IMHO.
There may be some new ones that can better it (difficult task) but I suspect they are not made by AD.
BTW, the AD8066 runs
, and on a quick test I made it didn't sound good to me.
The OPA2132 was much superior.
Sorry...
This is an excellent sounding op-amp IMHO.
There may be some new ones that can better it (difficult task) but I suspect they are not made by AD.
BTW, the AD8066 runs
, and on a quick test I made it didn't sound good to me. The OPA2132 was much superior.
Sorry...
hi carlos, and thanks for filling me in on the fact that the ad8066s normally run hot as, this was my first experience using them. i liked your article on the resistor class a bias tweak on the opa627s. i was about to try it but, in my adcom gfp 565 preamp, my opa627bps i installed are followed by the buf634t buffers which, i used to replace the original lt1010 buffers that came stock and wasn't sure if i would get the same results you described in your article. have you tried the resistor 5-10 ma. bias when such buffers were involved? thanks, crippledchicken
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