opa1656 in front end of FOSI V3 Mono

[pma]

Replacing the stock 5532 with something as fast as an OPA1656 on a DIP adapter is inviting trouble. Next time try OPA2891 for even more trouble ;-)
Rolling OpAmps is plain silly and should never be done by lay-people who have zero clue of what's going on under the hood of a circuit.

This is the key, guys are swapping op-amps without understanding datasheet information, without having an idea about Bode plots, without oscilloscope measurements to check stability and without proper measurements of distortion plots. Often with SMD parts in PCB DIP adapters. The result is then as the one described here in post #1. This is not a children playground. But our warnings are hopeless, they do not care about expert opinions.

 

[DACsNoMore]

This is the key, guys are swapping op-amps without understanding datasheet information, without having an idea about Bode plots, without oscilloscope measurements to check stability and without proper measurements of distortion plots. Often with SMD parts in PCB DIP adapters. The result is then as the one described here in post #1. This is not a children playground. But our warnings are hopeless, they do not care about expert opinions.

I was shocked the manufacturers are advertising opamp rolling, it is ok to mention swappable DIP sockets (folks who are looking for this would appreciate it). Hm, but then they make a good money from reselling SparkoS and Burson, so it is worse the risk as those cost more than amps. One should really have an insertion tool for DIP8 packaging IC (the pins are spread a little - it makes it very difficult to insert as pins and holes are not aligned), anti-static wrist band at minimum. The SMD mounted IC on DIP8 adapters are actually the easiest to insert as pins are straight and perfectly aligned.