Those Awaiting EE Minimax DAC Opamp Rolling...

Doug,

Thanks for all your hard work! I am getting ready to try this DAC and was just about to order the first set of op-amps from your very first article. I'm glad I didn't.

What combination, in your opinion, would a vinylphile/tuber like me like the best? I know, but after all you did the work...

I just did a quick read-through and my initial comments:

Thanks for taking the time to try these things out and write it up.

You say "For example, the red in the first row means you will reverse the order, such that the double AD797 would go into locations U1 and U2, and the single OPA627 set would go into locations U6 and U7!" The doubles are supposed to go into U1/2 and the singles in U6/7, so I think you crossed up the U1/2 vs. U6/7 in that statement.

Also, when a single is used in the "wrong" U1/2 positions, the solid state output doesn't work, correct? So why even mention what op-amps are placed in U6/7?

Also, you state "(IN RED)U1/U2 OPA827 (dual) and U6/U7 OPA2604 (single)(END RED) In the previous two, and now in this example, the Opamp in the U1/U2 positions has been the OPA827 and has yielded excellent results." Since this entry is in RED, this means that the single and duals are swapped, correct? So why do you say that the dual is in U1/2 and the single is in U6/7, which is actually the correct positioning.

I'll give the article a good going over tonite, but these are the first things that jumped out at me on first read through.

Thanks again for your efforts. I think some of the info in the article may not be what you intended to convey, though.

Also, in the paragraphs that follow the table, each of the BLACK entries lists a sigle in U1/2 and a dual in U6/7, which are the reversed positions, yet these entries are in BLACK, indicating that a dual was used in U1/2 and a single in U6/7.
Unless I'm missing something (and that's surely possible!), the article seems to be full of mistakes.

-Mike