A few questions about some things that are not that clear about opamp and the class A mod. About opamps, as I understand it, if they are dual I can just remove the existing one and insert another 8-DIP opamp. If they are single then I need this BrownDog
single-to-dual opamp adapter. Questions:
1. Is there any other similar (or better) adapter available from other sellers (Digi-Key, Farnell, Mouser, Newark). I am asking because I want to make one big order with all the opamps and other stuff that I need.
2. Should I solder to that adapter two 8-pin DIP socket (like
this or
this) and then mount to each one single opamp (like OPA627)? Or should I solder directly to that adapter the two single opamps, and if yes, what type of opamps should I buy for that (are they called soic?)?
With class A mod things are even more complicated for me. First of all, from what I read in
this article, there are different ways to make an opamp class A. From what I understand, the best method is the third one, the JFET Cascode. I really don't have a clue how all that work (the soldering needed will be done by a friend of mine with better soldering skills that my own, which is none), so if someone can summarize it a bit and point out what component exactly are needed to archive it, that would be great.
With that done, if I use a dual type opamp, I guess the thing to do is to take one 8-pin DIP socket (like the two models I mentioned earlier), and make it class A (I am thinking more about adding resistors here, I don't know if the JFET method works differently). Then putting this socket above the one existing socket in the amp and the opamp in it. Is there any way to avoid using this additional socket (by adding the transistors directly to the amp socket or to the opamp itself)?
If single opamp are used, the question is if the transistors cannot be added to the BrownDog adapter directly, or do they have to go to each socket that will hold each opamp?
Sorry if I don't make too much sense with some of my assumptions, doing my best to understand how these things works. Thanks.