Dual discrete opamp PCB in DIP8

[moamps]

Originally posted by Nelson Pass
[B]Anyone who wants can read the threads, the XVR1 manual,
any other material and decide for themselves. I stopped reading
the posts after the first few pages, so I didn't get to post #71,
and yes, on page 8 you belatedly attribute the manual, so I
stand corrected on that point.

Mr. Pass:

Now, why would you want to write things like that? Not only that you did get to post#71 at the time but even replied in post#77 on the same page. Also, I did not post my schematics until page 6 in that thread so I do not see how page 8 could be belated as compared to page 6?? Please, don't do that.

Also, I do not understand what prompted your belated reaction as MOX is water under the bridge. MOX is not particularly original either as it is based on a generic design for discrete opamps and SK-type crossovers that can be easily found anywhere, not just in the XVR1 manual. May I just remind you of your own words in the MOX thread and then we can let everybody be their own judge, indeed:

"Fred, I always appreciate your looking out for my interests
and the circuit looks a lot like an XVR1, but there is hardly
any ground-breaking stuff there. Also, anyone who wants to
implement Sallen-Key filters and their variations doesn't have
to talk to me.

Can I do better? Guess I'll have to....."

Regards,
Milan

[macka]

I propose to send my Mox "original design" with a Passlabs DIY stick on the front panel to Mr Pass for his verification.

No doubt this will be a good reason for a tasting session and may even throw a bottle of Aussie red in for good measure.

I thank both Mr Pass and Milan for their generous support in making this project possible. Without either, nothing would have happened and the prior crossover wars are hardly worth mentioning so lets not go there again .

Ian

[Nelson Pass]

Originally posted by moamps
Not only that you did get to post#71 at the time but even replied in post#77 on the same page. Also, I did not post my schematics until page 6 in that thread so I do not see how page 8 could be belated as compared to page 6??

Well, my post on page 8 gives you a clue:

"If you post over in the PassLabs forum, you have a better
chance of getting a response, as I only check here sporadically."

I'll tell you what: I officially declare you right, and I'm wrong.

Ian, thanks very much. Just send the wine....

[moamps]

OK,

Now I'll throw in a bottle of Croatia's finest with Macka's parcel and when you get on a vacation over here I'll fix you one of those little umbrella drinks that you're so fond of.

Peace,
Milan

[Nelson Pass]

You're such a gentleman that I offer my apology as well.



/pass/: umbrella drink will get you anything.

[GRollins]

Hmmm...interesting turn of events.
In the Mini-A and Aleph-X threads, I believe I referenced Nelson's relevant patents and stated that all concepts were his intellectual property.
After much yik-yak from certain members here, I started a crossover thread which I called the Xenover. I didn't really have time that point in my life to 'maintain' such a thread, and crossover threads are pretty much hit-or-miss affairs, anyway, but there it is. The Xenover had certain topological similarities to the XVR1, but also certain omissions. In particular, I treated the crossover design as an exercise in Sallen-Key topology and did not put in a discrete opamp at all--at least not at first. I did somewhat later put in a "speculative" discrete opamp in which I purposefully used a slightly wonky resistor value, just to see if anyone was paying attention. They weren't; not one person commented on it, as I recall. I think I put a few references to Nelson's commercial product in that thread, too, although there aren't any patents involved that I'm aware of.
Somewhere back in the mists of time, I had a thread on the Aleph 2. At this time it's a bit vague in my mind, but I'm pretty sure I put the patent information in there, too.
For the record, the only thread that Nelson and I formally coordinated was the Aleph-X, and even that one had an element of surprise for me in that he had asked that I remain quiet for a while longer (I was glad to do so), but then he sprung the surprise earlier than I anticipated. Not a problem, really--just thought he and I were going to sit on it a bit longer.
I've been accused of a great many personality failures and weaknesses over the years, but I try to remember to give credit to Nelson, John Curl, Walt Jung, et. al. when I find myself on a path that they have blazed. Should I have neglected to do so at some point, I hope any offended party will accept my apologies.

Grey

[wotsascott]

Hi 1 & all,
I stumbled on this by accident, so this is way to late, but you can get the A92 and A42 transistors at CPC,
take care!

[gil-garcia]

IS It possiblde to use 2sk389 V with the original BOM ?

As j want to realize a 18db cross over can j just use one AOP.
Do you advice to follow moamps configuration : one AOP for 6 or 12db ?
Thanks
Philippe