SD-1 Stacked Mod

[stefan3]

How stack both 4558 IC (or other opamps) in Boss SD-1 stacked mod ?

1. Connecting pin 1 first IC to pin 1 second IC, pin 2 to pin 2, etc... pin 8 to pin 8 OR
2. connecting ONLY pin 2 to pin 2, pin 3 to tin 3, etc.. pin 6 to pin 6 and pin 8 to pin 8 - pins 1 and pins 7 in this each IC are disconnected.

I don't now -(

PS Sorry for my bad English..

[petemoore]

  I burnt a chip set that way...
  Then started cooling the OA's, and used chilled thermal mass.
  But if you're good you can just solder them without frying them.
  Put one OA on top of the other OA. Make sure the pin 1's are oriented, both in top left corner.
  High heat, quick job, allow the chip to cool before doing the next pin, light solder makes less to heat, lay the solder over the joint so theres about a 3/16'' overhang...that's enough...put the iron on for barely enough time to heat both chip-pin-lugs and that amount of solder, tip contact to both lugs helps quicken the heating process.

[stefan3]

Big thanx for replay , i must conectting ALL pins both IC like this ?
http://www.barberelectronics.com/images/op2.jpg
(pin 1 first IC to pin 1 second IC, ... pin 8 first IC to pin 8 second IC).
I thought, that I must soldering together ONLY pins 2,3,4,5,6,8 both IC - pins 1 and 7 are not soldered.

[fuzzo]

That really changes something to stack AOP ?

[petemoore]

  Not really, or it depends, I tried a couple batches and couldn't taste any difference, maybe like a few grains of salt in a large recipe. 
  ..then I was always worried that the OA might have been damaged by heat.
  There have been reports that this indeed does this and smooths that, I suppose it depends on what it depends on, and I wasn't having that at the time.
  http://www.muzique.com/lab/superbuff.htm
  Not exactly raw, stacked opamps, but they're parallel, Jack has drawn/written this up.